FAMILY CULICID.E THE JIOSQUITOES 93 



KEY TO GENERA* 



1. Proboscis not elongate, extending but little beyond the clypeus; wings 



with scales (when present) confined mostly to the fringe. (Chao- 



borinas ) 2 



Proboscis elongate, extending far beyond the clypeus; wings with the 

 veins and margins with scales (Culicin^) 5 



2. Anal vein ends beyond the fork of the fifth vein 3 



Anal vein ends before the fork of fifth vein Eucorethra Underwood 



3. First tarsal segment longer than the second 4 



First tarsal segment shoi'ter than the second Mochlonyx Lcew 



4. First vein ending much closer to the tip of the anterior branch of sec- 



ond vein than to that of the auxiliary vein (III-7). 



Chaoborus Lichtenstein 

 First vein ending nearer to tip of auxiliary vein than to anterior branch 

 of second vein Corethrella Coquillett 



5. Abdomen without scales, or at least with the sternites largely bare; 



scutellum with the margin convex, evenly setose; never a spurious 

 vein behind fifth vein (1-3, and text figure of larva). .Anopheles Meigen 

 Abdomen with both tergites and sternites completely clothed with 

 scales; scutellum trilobed, the lobes alone setose; if scutellum evenly 

 convex then a spurious vein behind fifth vein 6 



6. Proboscis rigid, the outer half more slender and bent backwards; a 



spurious vein behind the fiftli vein (1-5, III-l, III-2). 



Megarhinus Desvoidy 

 Proboscis more flexible, of uniform thickness (at times swollen at tip), 

 outer half not bent back; never a spurious vein behind fifth vein. . . 7 



7. Base of hind coxse in line with or above the upper margin of the meta- 



steiTial sclerite S 



Base of liind coxae below upper margin of metasternal sclerite 16 



8. Pronotal setae absent; prothoracic lobes not widely separated 9 



Pronotal setae present; prothoracic lobes widely separated 14 



9. Prealar setae absent 10 



Prealar setae present 1] 



10. Propleural setae absent Sabethes Desvoidy 



Propleural setae present Sabethoides Theobald 



11. Spiracular setae present 12 



Spiracular setae absent Limatus Theobald 



12. Lower sternopleurals distinctly below the upper margin of metasternal 



sclerite 13 



Lower sternopleurals extending to or above the upper margin of the 

 metasternal sclerite Dendromyia Theobald 



13. Outstanding scales on at least the basal portion of the second and 



third veins broad Miamyia Dyar 



These scales usually narrow (II-8, III-6) Wyeomyia Theobald 



* Checked by Dr. R. Matheson. 



