New mites from the Yampa Valley (Acarina: Cryptostigmata: Oribatulidae, Passalozetidae)

A study was made of the soil mites from under different vegetative types near a coal - burning power plant in the Yampa Valley near Hayden, Colorado. The following new species of oribatids were found: Zygoribatula apletosa n.sp., Multoribates haydeni n.sp., Paraphauloppia cordylinosa n.sp., Passalozetes moniles n.sp.       

New species of Astragalus (Leguminosae) from Mesa County, Colorado

Named and described is Astragalus debequaeus Welsh from Mesa County, Colorado.         

A comparison of the structure and function of the cerotegument in two species of Cryptostigmata (Acarina)

Cerotegument plastron structure and function are compared in two species of non-related Cryptostigmata from different families in two environments prone to flooding, namely soil and leaf litter, as represented by Euzetes globulus (Nicolet) (Euzetidae), and the intertidal zone by Ameronothrus marinus (Banks) (Ameronothridae). Differences in cerotegument structure reflect the degree of exposure to mechanical stresses and hydrostatic pressure encountered in these two environments. Cerotegument plastrons communicate with the tracheal system in heavily armoured species, e.g. E. globulus, but gas transfer may occur across the cuticle in those species having a lightly sclerotized leathery cuticle, e.g. A. marinus.     

Microhabitat partitioning by two chipmunk species ( Tamias ) in western Colorado

We examined microhabitat use of sympatrically occurring Tamias minimus (least chipmunk) and T. rufus (Hopi chipmunk) in a pi?on-juniper/sagebrush vegetative community near Molina, western Colorado, from October 1994 to June 1999. This community is dominated by 2 major microhabitat types: shrub (sage; Artemisia spp.) and tree (pine and juniper; Pinus edulis and Juniperus scopulorum ). Small mammals were live-trapped, marked, and released throughout this study. When it was the most abundant Tamias species on the study plots (1994-1997), Tamias minimus captures were associated with trees. Tamias rufus also exhibited this association but was captured at very low abundances during this period. Tamias rufus abundance was much greater, on average, than that of T. minimus between 1998 and 1999. During this time T. minimus captures were not associated with trees, but T. rufus captures remained associated with trees. As has been previously reported for other Tamias species, the greater abundance of 1 of 2 coexisting congeners in select areas may play a role in the microhabitat use of these 2 chipmunk species.     

New records and species of Tetranychidae and Tenuipalpidae (Acarina) from Utah and Idaho

Twenty-three species of spider mites (Tetranychidae) are recognized for Utah and Idaho; three of these are described as new: Bryobia neoribis, Pseudobryobia knowltoni, and Schizotetranychus agropyron. Eleven species of Tenuipalpidae are recorded.     

New and little known oribatids from Kenya,with descriptions of two new genera (Acari: Oribatida)

A list of newly collected and identified oribatids from Kenya is presented, two of them represent new genera; Sceletoppia gen. nov. (Oppiidae) and Mahnertozetes gen. nov. (Haplozetidae). Twelve species, belonging to the families Steganacaridae, Lohmanniidae, Tetracondylidae, Microzetidae, Zetomotrichidae and Galumnidae are new to science. Taxonomical notes on two other species are given.     

An Irvingtonian species of Brachylagus (Mammalia: Lagomorpha) from Porcupine Cave, Park County, Colorado

Brachylagus is currently a monotypic genus of uncertain origins and known only from Holocene and late Rancholabrean. A new species of leporid is described from the early and middle Pleistocene (Irvingtonian) deposits of Porcupine Cave, Park County, Colorado. Stratified deposits of the Pit and the Velvet Room, 2 localities within Porcupine Cave, have been dated biochronologically and paleomagnetically fro the middle Irvingtonian and early to middle Irvingtonian, respectively. Brachylagus coloradoensis sp. nov., is characterized by its conserved p3 enamel patterns which are intermediate between B. idahoensis and Hypolagus, and its size which is slightly larger than that of B. idahoensis . This suggest a possible ancestral relationship between Hypolagus and Brachylagus .     

New records and range extensions of species of Dipogon (Hymenoptera, Pompilidae) in Colorado

Four species of Dipogon are recorded from Colorado for the first time. These are hurdi Evans, pulchripennis (Cresson), graenicheri Banks, and brevis (Cresson). All are inhabitants of wooded areas and are believed to nest in cavities in trees. Notes are presented on habitat and prey of these 4 species and of the recently described species kiowa Evans.     

Respiration in Fortuynia maculata Luxton (Fortuyniidae: Cryptostigmata: Acarina) with particular reference to the role of van der Hammen's organ

The respiratory system of Fortuynia maculata Luxton (Fortuyniidae) consists of two cerotegument plastrons connected to the tracheae associated with the leg coxae via the acetabular cavities and to brachytracheae associated with the bothridia via paired van der Hammen's organs. The van der Hammen's organs allow oxygen gas to pass from the plastrons to the brachytracheae.     

New species and a new combination of Mentzelia section Bartonia (Loasaceae) from the Colorado Plateau

A new species, Mentzelia (sect. Bartonia ) cronquistii , subfamily Mentzelioideae, is described and a new combination, M. (sect. Bartonia ) marginata (Osterhout) is made. These two species of the Colorado Plateau are closely related to each other, but their relationships to other species in section Bartonia are obscure.     

Mites of the genus Malaconothrus (Acari: Cryptostigmata) from the British Isles

Two new species of Malaconothrus (M. purvisi and M. scutatus) are described. The status of this genus in the British Isles is clarified and a key is provided to the species.     

New records for Monotropa hypopithys (Ericaceae) from Colorado

Monotropa hypopithys L., rarely collected in Colorado, was taken five times during 1984. Coupled with previous collections, it is now known from 10 Colorado counties. The cool, moist August of 1984 may have contributed to its apparent ubiquity.     

Colorado ground beetles (Coleoptera: Carabidae) from the Rotger Collection, University of Colorado Museum

Ground Beetles from Rotger's collection of Colorado specimens have been identified, principally by the author, and a faunal list of 161 species from 80 localities is presented. The list includes 35 species not previously recorded from Colorado. Comparisons are made with Armin's (1963) carabid list from Boulder County and the diversity of species along transects through four elevational zones from the plains to the alpine.     

New species of Pauropodidae (Myriapoda: Pauropoda) from Nanjing,China

Six new species in the family Pauropodidae are described from China: Allopauropus disphaeroides sp. n., A. crassescens sp. n., A. apicalis sp. n., A. nanjingensis sp. n., Pauropus dorsappendix sp. n., and Stylopauropus zijinensis sp. n.     

Symbos cavifrons (Artiodactyla: Bovidae) from Delta County, Colorado

A partial cranium belonging to the extinct woodland musk - ox, Symbos cavifrons, is reported from the headwaters of Oak Creek, Delta County, Colorado. This is the first cranium of the genus Symbos to be described from the Colorado Plateau, and it helps to define the southwest boundary of the known range of the genus.         

Branchinecta hiberna , a new species of fairy shrimp (Crustacea: Anostraca) from western North America

Branchinecta hiberna , a new species of fairy shrimp, is described from temporary pools in the Great Basin region of south central Oregon, northeastern California, and adjacent Nevada. The new species shares several characters with Branchinecta cornigera Lynch, 1958: males bear a similar large patch of small spines on the basal segment of antenna 2, and females bear the similar robust antenna 2 with medial spur, brood pouch shape, and resting egg (cyst) morphology. The new species differs from B. cornigera in the shape of the distal segment of antenna 2 and the number and size of spines on the paired penis warts of males, and in the thoracic spine pattern and lack of dorsal cephalic projections in females. Observations on behavior and ecology of B. hiberna are discussed.     

New species of Dolichopus Latreille, 1796 from China (Diptera: Dolichopodidae)

The following three new species of Dolichopus are described from China: Dolichopus (Dolichopus) jilinensis sp. nov., D. (D.) longipilosus sp. nov. and D. (D.) yangi sp. nov. Three new species are reported from China, and a key to the Chinese species of the genus Dolichopus is presented for the first time.     

New species of Eustigmaeus Berlese, 1910 (Acari: Stigmaeidae) from Turkey

Two new species of Eustigmaeus from Turkey, E. bali and E. turcicus, are described and illustrated.     

The British oribatid mites (Acari: Cryptostigmata) of Warburton and Pearce

Two of the oribatid species described by Warburton and Pearce (1905) are redescribed, and three are synonymized, from original material. Forty-one identifications made by Warburton (1904) and Warburton and Pearce (1904. 1905) are reinterpreted; eight of their records retain the taxonomic status originally assigned to them; and two taxa (including one of their new species) are declared species inquirendae.