Teeth of adminiculum arms approximate _ 



ART. 10 THE FAMILY SIMULIIDAE DYAR AND SHANNON 25 



Clasper simple or with a single spine at tip. 

 Adminiculum simple, arcuate. 



Adminiculum arms with 3 very large teeth on each side. 



occidentale Townsend. 

 These arms with smaller, more abundant dentation. 

 No projection at base of clasper. 



notatum Adams, 

 venator, new species. 

 griseum Coquillett. 

 trivittatum Mallocli. 



Three small teeth separated by fimbriae piperl, new species. 



A round projection at base of clasper slossonae, new .species. 



Adminiculum with central cone, traversing and exceeding disk. 



virgatum Coquillett. 

 Adminiculum contracted, solid, tooth-shaped. 

 Clasi)er with a spinose projection at base. 



Projection rounded perissum, new species. 



Projection narrow and compressed. 



Adminiculum broad, quadrate vaudalicum, new species. 



Adminiculum conical, narrow jacumhae, new species. 



Clasper simple. 



Adminiculum with a central lacuna and narrow tip parnassum Malloch. 



Adminiculum tooth-shaped. 



Spines of adminiculum and adminiculum arms large arcticum Malloch. 



Spines of adminiculum and adminiculum arms small venustum Say. 



No males are at hand of nieridionale, Imnteri, sayi, haematopotuni, ti'ivit- 

 tatiun, niediovittatum, bivittatum, and metaUicuni. 



KEY TO THE .SPECIE.S OP' SIMULILI.M, BARED ON FEMALE HYPOPYGIA 



Anal lobe broad and setose laterally. 



Anal lobe not strongly produced ventrally. 



Anal lobe rounded, unmodified, similar to the cerci. 



Anal lobe not widened ventrally, uniform. 



Forks of genital rod with large triangular widenings. 



slossonae, new species 



Forks of genital rod with small triangular widenings. 



meridionale Riley. 



Forks of genital rod with distinct tooth. 



The chitinized rod beyond tooth straight and smooth. 



occidentale Townsend. 



The part of arm beyond tooth irregularly margined. 



Tooth sharp and slender perissum, new species. 



m *, 1 . ^ ^ .- f venustum Say. 



Tooth blunt, truncate { ^. .. ,, . 



[ arcticum Malloch. 



Anal lobe roundedly widened ventrally, the part behind cerci narrow. 



Anal lobe with large clear expanded area with many fine setae. 



vitattum Zetterstedt. 



Anal lobe with small ventral pilose area or none. 



Tips of ovipositor .sheaths approximate, dark brown, fimbriage. 



Ai-ms of genital rod with large dark tooth expanded beyond into 



membrane decorum Walkei*. 



These with moderate nontruncate tooth parnassum Malloch. 



3613—27 i 



