26 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



Anal lobe heavily chitinized and modified. 



Anal lobe broad below ^ — pictipes Ha;j;en. 



Anal lobe curved posteriorly, narrowly truncate. 



Anal lobe more slender than cerci. 



Arms of genital rod with short round teeth hnnteri Malloch. 



These with long sharp tooth sayi, new species. 



Anal lobe produced, as long as cerci metallicum Bellardi. 



Anal lobe sharply produced ventrally. 



•Anal lobe ventrally with a clear angle. 



Arms of genital rod quadrate, half surrounding genital opening, expanded 



with chitinized rod to tip with long tooth from its base. 



haematopotum Mnllocli. 



Anns narrow, widely expanded, extending beyond the ehithiized rod, with 



a curved apical chitinization but no tooth mediovittatum Knab. 



Anal lobe ventrnlly drawn out into a long digitate process. 



, , , , , f bivittatiim INIallocli. 



Anal lobe triangularly produced, not chitinized an- , , . , 



.;,..., < notatum Adams. 



teriorly, or weakly chitinized . „ ... ,^ 



[ griseam Coquillett. 



Anal lobe digitately produced, more distinctly chiti- f trivittatum Malloch. 



nized anteriorirly [venator. new si>ecies. 



Anal lobe narrow with a single row of very coarse setae, expanded below ; 



arms of genital rod with chitinized horns at inner and outer angles and 



at tip; ovipositor liaps thin but long virgatum Coquillett. 



We have no females of hi/dationis, pipcri, vandalicnm, and jacumhae. 



KEY TO FEMALES OF SIMULIUM, ACCOKDING TO BXTKRNAL CHAP.ACTRnS 



Claws with a very strong basal projection, without subbasal tooth. 



Front narrow, grayisli opaque ; fore coxae and legs normal, entirely black ; 

 mesonotum trivittate; grayish species. 



meridionale Kiley ; occidentale Townsend. 

 Front broad and shining idack ; foie coxae yellowish ; legs bicolored ; mesono- 

 tum very indistinctly bivittate ; shining black species. 



slossonae. new species. 

 Claws with the base but little produced, but with a subbasal tooth ; legs 

 bicolored 

 P^'rons opaque, grayish pruinose. 



Fore coxae yellowish ; eyes very deeply incised virgatiim Coquillett. 



Fore coxae blackish ; eyes moderately incised sayi, new .species. 



Frons shining black ; fore coxae yellowish. 

 Mesonotum distinctly trivittate. 



Mesonotum without pearlaceous coloring hunteri Malloch. 



Mesonotum with distinct pearlaceous coloring metallicum Bellardi. 



Mesonotum without vittae. 



Mesonotal and stem \ein black pilose parnassum Malloch. 



Mesonotal and stem vein pale pilose arcticum Malloch. 



Claws simple, legs bicolored. 



Fore coxae black ; frons opaque, grayish pollinose ; last 3 tergites subopaque, 

 dusted with gray poUinosity. 

 Fore tibia partly yellow with a large white pollinose patch : 5 mesonotal 



stripes vittatum Zetterstedt. 



Fore tibia entirely grayish black, without white pollinostity, although 

 white pile is present; 3 mesonotal stripes pictipes Hagen. 



