. I0 y 



CORETHRIN^. 



1. Hind metatarsi shorter than the following joint {Corethra* Coquil- 



lett). (fig. 29) ...... Mochlonyx. 



Hind metatarsi longer than the following joint. ... 2 



2. Small species; ungues simple. .... 3 

 L/arge species (lomm); ungues bifid. . . . Pelorempis. 



2. Antennae verticillate (Sayomyia Coquillett) (7). Corethra. 



Antennae of male thickly clothed with long hairs; of the female 



with a basal and an irregular median circlet of hairs on each 



joint. ........ Corethrella. 



AFTER DYAR AND KNAB. 



1. Metanotum without setae (Culicini). ..... 2 



Metanotum with setae (Sabethini). ..... 15 



2. vScutellum evenly rounded, not lobed. ..... 3 



Scutellum distinctly trilobate. .....: 4 



3. Second marginal cell longer than itspetiole (fig. 31) Anopheles. 

 Second marginal cell less than half as long as its petiole (1, 2) . 



Megarhinus. 



4. Hind tibiae near their tip with a row of seven to twelve closely 



set setae. .......... 5 



Hind tibiae with none to five sparsely set setae. ... 14 



5. Scutellum with its median lobe elongate, collar-like, not tubercu- 



larly prominent, ......... 6 



Scutellum with its median lobe distinctly prominent and tuber- 



1 li . I I . y 



6. Terminal antennal joints slender, long. . . Mansonia. 

 Terminal antennal joints short, broad. . . . Aedomyia. 



7. Second joint of antennae very long, 14:1. . Deinocerites. 

 Second joint of antennae moderately long, less than 8:1. . 8 



8. Second marginal cell less than half as long as its petiole. 



Uranotsenia. 

 Second marginal cell at least nearly as long as its petiole. 9 



* My examination of the literature leads me to quite different con- 

 clusions than those of Coquillett regarding the types of Corethra and 

 Mochlony.r. There is no call for disturbing these names so long es- 

 tablished. 



