ART. 10 THE FAMILY SIMULIIDAE DYAR AND SHANNON 37 



SIMULIUM MEDIOVITTATUM Knab 



Slmulium mediovittatum Knab, Ins. Ins. Mens., vol. 3, 1916, p. 77. 

 Very close to venator^ but of a general darker color, the scutellum 

 blaclrish, legs more extensively black, second tergite with a central 

 black spot. 



Female hypopygiiim exactly as in haenuitopotum. 



Thirteen specimens at hand. 



Type locality. — Arlington, Tex. Type in U. S. National Museum. 



Cat. No. 19635, U.S.N.M. 

 Distribution. — Texas: Arlington, October 28, 1914 (F. C. Bish- 

 opp). Bay City, January 26, 1911 (C. T. 

 Atkinson). 



SIMULIUM BIVITTATUM Malloch 



Simulium hivittatum Mallocii, U. S. Dept. Agr., Bur. Ent., Tech. Ser. No. 

 26, 1914, p. 31. 



The mesonotum shows seven distinct stripes including the pale 

 lateral which are alternating pale pollinose and orange colored. 

 Female hypopygium as in notahmi exactly. 

 Ten specimens at hand. 

 Type locality. — East Las Vegas, N. Mex. Type in U. S. National 



Museum, Cat. No. 15415, U.S.N.M. 

 Distribution. — Colorado: Virginia Dale, September 31, 1912 (F. 



C. Bishopp). August 17, 1906 ( ). 



Montana : Great Falls, July 7, 1921 (H. G. Dyar) . 

 New Mexico : East Las Vegas, June 1, 1901 (T. D. 

 A. Cockerell). Las Vegas Hot Springs, August 

 19, 1901 (H. S. Barber). 



SIMULIUM TRIVITTATUM Malloch 



Simulium ti-ivittatum Malloch, U. S. Dept. Agr., Bur. Ent., Tech. Ser. No. 



26, 1914, p. 30. 

 Simulium distinctum Malloch, U. S. Dept. Agr., Bur. Ent., Tech. Ser. No. 

 26, 1914, p. 30. 

 The seven stripes of the mesonotum are alternating pale pollinose 

 and black, the stripes of nearly equal width. 



Female hypopygium. Cerci infuscated, sparsely setose, anal lobe 

 roundly produced, with a long fringe-shaped ventral process, finely 

 pilose at tip; anterior margin of segment infuscated. Eighth stern- 

 ite plate dark and coarsely setose. Genital rod dark, the arms pale, 

 triangularly widened, a chitinized rod beyond with a tooth from its 

 base. (Figs. 78 and 79.) Male hypopygium as in n<?2^«/wm. (Figs. 

 115 and 116.) 



Seven specimens at hand. 



