(32 MISC. PUBLICATION 336, U. S. DEPT. OF AGRICULTURE 



7. Wings with four distinct black spots; palpi dark; femora with very 



small spots of white at tips (knee spots). [Processes of ninth tergite 

 of male stout, expanded at tip.] Prevalent throughout the South 



Anopheles quadrimaculatus 

 Palpi ringed with white scales, or knee spots lacking; dark spots on 

 wings usually indistinct : general appearance very dark. [Processes 

 of ninth tergite of male long and pointed.] 8 



8. Palpi narrowly but usually distinctly ringed at apex of each segment; 



knee spots present. [Phallosome (mesosome) of male with second 

 pair of leaflets from apex more than half the length of first pair.] 



Breeds in fresh water Anopheles ivalkeri 



Knee spots usually absent; palpi with faint white rings on apical seg- 

 ments or entirely dark ; wing spots indistinct or lacking. [Phallosome 

 of male with the second pair of leaflets no more than half the length 

 of first pair.] Breeds in salt water Anopheles atropos 



9. Proboscis normal, straight or only slightly curved, not tapered. [Scutel- 



lum trilobed and with separated tufts of setae.] Tribe Culicini 11 



Very large iridescent species of striking appearance ; proboscis rigid, 

 the outer half tapered and sharply curved downward (fig. 2, A). [Fe- 

 male palpi one-half or two-thirds as long as proboscis; second mar- 

 ginal cell less than half as long as its petiole; scutellum evenly 

 rounded and scaled.] Rare tree-hole breeders 



Tribe Megarhinini, genus Megarhinus 10 



Figuke 18. — Wing of Uranotaenia, showing relation of length of the second 

 marginal cell (o) to its petiole (a) ; also the short anal vein (an). 



10. Front tarsi of male entirely dark. [Mesonotuni dark, with a median 



line and a border of white or yellowish scales ; abdomen dark blue 

 above, yellowish below ; palpi and legs with iridescent blue reflections ; 

 female tarsi of front and middle legs with second, third, and part of 

 fourth segments white ; hind tarsi with fourth and most of fifth 

 segments white; male with fourth segment of hind tarsi pale and 

 second segment of middle tarsi pale on one side, or dark ; front tarsi 

 dark.] Occurs sparingly throughout the South 



Megarhinus septentrhnalis 



Female very similar to above ; male also similar except that second 



and part of third segments of front and middle tarsi are pale dorsally. 



Very rare, Florida and Georgia Megarhinus rutilus 



11. Second marginal cell normal, as long as or longer than its petiole ; mostly 



medium-sized or large species, or, if small, without lines of bluish 



scales on thorax 13 



Second marginal cell less than half as long as its petiole (fig. IS) ; very 

 small species with lines of bluish or purplish scales on thorax and on 

 base of vein 5. [Anal vein short, ending before level of fork of vein 

 5 ; squamae bare ; palpi short in both sexes.] Genus Uranotaenia 12 



12. Mesonotum with a narrow median longitudinal line of bright bluish 



scales (fig. 12, J) ; tarsi all dark. A common species 



Uranotaenia sapphirina 

 Mesonotum dark above, with a short line of purple scales on lateral 

 margin; patches of pale purplish scales on sides of thorax and on 

 anterior pronotal lobes; apex of third and entire fourth and fifth 

 hind-tarsal segments white. Common in Florida and southern Loui- 

 siana Uranotaenia loioii 



13. Tarsi not ringed with white and mesonotum without distinct mark- 



ings (except small white dots in C. restuans) 14 



Tarsi with pale markings or mesonotum marked with bicolorous scaling 

 in definite patterns (lines or patches) 25 



