110 GENERA OF CULICIN^ [CH. 



5. Eighth segment of female abdomen slender, 



retractile ; male resembling a Stegomyia . . Howavdina. 

 Eighth segment of female abdomen broad trun- 

 cate (except in Mimomyia), not retractile . . . . . . 6 



6. Head without any flat scales in the middle above ; 



proboscis never swollen at tip . . . . . . . . . . 7 



Head with at least a row of flat scales round the 

 eye margins, usually almost entirely clothed 

 with flat scales ; proboscis often swollen at 

 tip .. .. .. 13 



7. Wing scales very broad and dense . . . . . . . . 8 



Wing scales not very broad . . . . . . . . . . 9 



8. Male palpi as long as proboscis, thin last joint very 



short . . . . . . . . . . . . Mansonioides. 



Palpi similar in both sexes, very short ; middle 



femora with a tuft of scales at the tip . . Mdomyia. 



9. Fork cells very short ; wings nearly bare ; male 



palpi two-jointed . . . . . . . . Mimomyia. 



(Includes Boycia, Conopomyia, Hispidimyia, Ludlowia, Mimomyia, 



Radioculex, of Theobald, etc.) 

 Fork cells not very short ; male palpi three- 

 jointed . . . . TO 



10. Metatarsus of hind-legs distinctly shorter than the 



tibia ; male palpi long, the last two joints 



swollen . . . . . . . . . . . . . . . . ii 



Metatarsus of hind-legs at least as long as the tibia, 



male palpi thin . . . . . . . . . . . . . . 12 



11. Penultimate joint of male palpi thicker and some- 



what longer than terminal one, usually yellow 



species . . . . . . . . . . . . Tceniorhynchus. 



(Includes T&niorhynchus and Mansonia of Theobald.) 

 Penultimate joint of male palpi thinner but not 



longer than terminal one ; not yellow species ; 



cross-veins almost in a line . . . . . . Theobaldia. 



12. Male palpi longer than proboscis, last two joints 



curved upwards . . . . . . . . . . Culex. 



(Includes Aporoculex, Heptaphlebomyia, Lasioconops, Leucomyia, Lutzia, 



Maillotia, Melanoconion, Microculcx, Oculeomyia, and Tnchopronomyia 



of Theobald.) 

 Male palpi shorter than proboscis, straight . . Protomelanoconion. 



13. A row of small flat scales round the eyes ; basal 



joint of male palpi with a row of projecting 



scales ; otherwise like Culex . . . . . . Culiciomyia. 



(Includes Culiciomyia, Trichorhynchus, Neomelanoconion, and Pectino- 

 palpus of Theobald.) 



Head mostly or entirely flat-scaled in middle .. .. .. 14 



14. Proboscis not swollen at tip ; fork cells not very 



short .. .. 15 



Proboscis swollen at tip or fork cells very short, 



first shorter than second . . . . . . . . . . 17 



