Ai!T. 10 THE FAMILY SIMULIIDAE — DYAE AND SHANNON 45 



tened, a spine at tip, a small compressed spinose projection at base. 

 Adniinicuhim conic, rounded, smooth, heavily chitinized. the large 

 basal prongs oblique, resembling a bishop's hat. Adminiculum arms 

 with close spines at the outfolds, mixed with fimbriae ; lateral plat/^s 

 large, lined. (Figs. 113 and 114.) 



Type locality, — Jacumba Springs, Calif. 



T^ype.— Cat.'No. 28348, U.S.N.M. 



Distribution. — California: Jacumba Springs (E. A. McGregor). 



SIMULIUM VENUSTUM Say 



SimuUum rcmistiitn Say. Journ. Ac;ifl. Sci. Pliila., vol. 3, 1S29. p. 2S. 

 Simulium piscicidium Riley, Anier. Ent., vol. 2, 1870, p. 367. 

 SimuUum molestum Harris, Insec. Inj. to Veg., ed. 3, 1862, p. 601. 

 Simulinm irritatum LuGGiai, 2d Rept. Ent. Minn.. 1896. p. 177. 

 Simulium miniiium Lugger. 2d Rept. Ent. Minn., 1896, p. 177. 

 SimuUum jcnninf/si Malloch (part). IT. S. Dept. Agr., Bnr. Ent., Tecli. Ser. 



No. 26, 1914. p. 41. 

 SimuUum rileiiana Enderlein, Konowia, vol. 1, 1922, p. 75. 

 Simulium reptans Imms (not Linnaeus), Text Book of Entomology, 1925, 



p. 625. 



A variable species in size, small to rather large, and variable in 

 coloring. Frons shining, as broad as clypeus; fore coxae yellowish; 

 legs bicolored, the tibiae with distinct silvery pollinose patches; 

 fore tarsi broadened ; claws simple : tergites, six to nine, shining; pre- 

 ceding ones opaque black with greatly reduced tergites. The form 

 described as jenningsi Malloch has the sides of the mesbnotum dis- 

 tinctly pearlaceous. 



Femle hypopygium : Cerci rounded quadrate, infuscated, setose, 

 ninth .segment rather broad, uniformly chitinized centrally, setose, 

 the ventral area slightly truncately produced and with fine seta. 

 Arms of genital rod divaricate, thickened outwardly, and forming 

 irregular dentation of two or three truncate or blunt teeth. (Figs. 

 76 and 77.) 



Male hyjDopygium : Side piece rounded quadrate, wider than long. 

 Clasper twice as long as side piece, thick, rounded, a little constricted 

 outwardly, with sharp terminal spine. Adminiculum short, square, 

 with minute denticles at tip, the basal prongs divaricate, thick, 

 truncate tipped. Adminiculum arms with many long teeth mixed 

 with fimbriae, lateral plates quadrate. j:)roduced at one angle. (Figs. 

 97, 98, and 99.) 



Extremely abundant throughout Xorth America, probably ex- 

 tending into the Arctic Circle. In California, two closely allied 

 species vavdalim/n and jacmnhae take its place. In some regions it 

 is exceedingly annoying to man and animals. jS'early a thousand 

 specimens at hand. Closely allied to the European reptans Linnaeus, 

 but distinct on details of the hypopygium of both sexes. 



