4 PROCIiEDlNGS OF THE NATIONAL MUSEUM vol. 01* 



upper side of radial A-ein pilif eroiis on its entire length ; fold between 

 media and cubitus distinct, forked; chitinization of termites usually 

 reduced, of the sternites usually much reduced. 



Ki;r TO THE SPECIES OF pltOSIMULIUM 



Claws distinctly bifid (i. e.. basiil portion tooth-like) ; anal lobes of the female 

 (below cerci) partially or not chitinized, with setae lu a group. 

 Integument yellow ; front at greatest width about half its length ; only mese- 



pimeron tuft present cnychodactylum, new species. 



Integument black; front broader; three pleural tufts, viz, on anterior stern©- 



pleura, lower pteropleura, and niesepinieron pleiirale Malloch. 



Claws not bifid. 

 Antennae nine-jointed with basal joints black ; legs black ; female anal lobes 



as in onychodactylum and pleurale novum, new species. 



Antennae 11-jointed ; basal antenna! joints yellowish; legs usually yellowish; 

 anal lobes of female chitinized and evenly setose like the cerci. 

 Female ovipositor reaching tip of abdomen; aniil lobes strongly produced 

 and coarsely hairy ventrally. 

 Third antennal joint distinctly t'lilarged as compared with the second; 



large species magnum, new species. 



Third antennal joint not conspicuously enlarged, medium-sized species. 



Stem vein dark pilose diciim, new species. 



Stem vein pale pilose dicentum, new species. 



Female ovipositor shorter and weaker; anal lobes evenly setose, not 

 stronger ventrally ; medium-sized species. 



Integument yellow fnlvum ("oquUlett. 



Integument black. 



Male adminicuium evenly arcuate, broad, smooth hirtipes Fries. 



Male adminicuium ovate with narrow projecting center, the basal arms 



broad and lobed exigens, new species. 



Male adminicnluni with lobed bifid center; basal arms detached. 



pancerastes, new species. 



PROSIMULIUM ONYCHODACTVLUM. new species 



A species that is quickly characterized by its broAvnish yelloAV 

 integument ; very narrow front, large antennae, yellowish legs, bifid 

 claAvs. OAdpositor undeveloped. li))s of opening membranous, not 

 produced, spicular. Genital rod forked, limbs slender, weak out- 

 wardly but slightly expanded. Cerici rounded quadrate, wider than 

 long. Lobes of last segment round, small, spicular, with a group of 

 about 10 scattered setae; no chitinized area. (Figs. 10 and 11.) 



Male and immature stages unknown. 



Ti/pe Jocatit;/. — Long's Peak, Colo. 



7>//>6.— Female, Cat. No. 28324, TT.S.N.M. 



Distribution. — Coloijado: Long's Peak Trail, timberline, 11,000 

 feet altitude. August 28 (T. D. A. Cockerel!). 



