AKT. 10 THE FAMILY SIMULIIDAE — DYAR AND SHANNON O 



PROSIMULIUM PLEURALE Malloch 



ProximuliuHi iileurale Malloch, U. S. Dept. Agr.. lUir. Eiit., Tech. Ser. No. 

 26, 1914, p. 17. 



A species easily characterized by the bifid chiws and the three 

 J pleural j^atches of pile. 



Male and immature stages unknown. Ovipositor: Essentially as 

 in horif/n; flaps rounded, slight spicular. Cerci transverse, twii'e 

 as wide as long, strong, chitinized, setose. Tips of last segment very 

 narrowly chitinized, the membranous ventral area large with a gioup 

 of about six tubercles contrnlly. closely placed and bearing hmg 

 slender setae. Genital rod Avidely forked, the arms very slender 

 but widening to a strong, conical, outv^'ardly dentate [)hite on each 

 side. (Fig. 18.) 



Four specimens at hand. 



Tij^e locality. — Kaslo, British Columbia. Type in U. S. National 



Museum, Cat. No. 15403, U.S.N.M. 

 DistHhution. — Alaska: Hurricane, July 15, 11)21 (J. M. Aldrieh). 

 Camp 334, Alaska Eng. Com. July 9, 13, 1921 

 (J. M. Aldrieh). 

 British Columbia: Kaslo, June 18, 1903 (R. P. 

 Currie). 



PKOSIMULIUM NOVUM, new species 



In general appearance very close to hirtipes. Differs m liaxing 

 onl}' nine joints to the antenna, the joints being unusually well s;ep- 

 arated and distinct; entire body, including antennae and legs, black; 

 pilosity yellowish; stem vein with pale pile; squamal cilia wliitish. 

 Ovipositor, practically none; margins of opening membranous, 

 curved, not produced backward. Ceri rounded, quadrate, not as long 

 as Avide ; tips of last segment reduced, narrowly chitinized and setose 

 above, rounded and membranous below, with a group of short stiff 

 setae on large tubercles. Genital rod widely forked, the limbs first 

 Jiarrowed and black, then expanded into a large irregular chitinous 

 l)late. (Figs. 14 and 15.) 



Length 4 mm. ; wing 4.25 mm. 



Apparently a mountain species. Specimens from Gospal Moun- 

 tain, Idaho (J. M. Aldrieh), bear labels '' Bad on horses." Male and 

 immature stages unknoAvn. Forty specimens. 



Type locality. — Two Medicine Lake, Montana. 



Types.- — -Tavo females, paratypes. 30 females. Cat. No. 28325, 

 U.S'.N.M. 



