THE MOSQUITOES OF THE SOUTHEASTERN STATES 63 



14. Antennae normal, not longer than proboscis, first flagellar segment of 



about same length as succeeding ones 15 



Antennae much longer than proboscis, with a very long first flagellar 

 segment, equal in length to several of succeeding ones. [Tip of ab- 

 domen somewhat appressed laterally, making height equal to width; 

 sternopleural sclerite almost completely covered (shingled) with dark 

 appressed scales ; mesonotum with hairlike scales ; palpi and antennae 

 similar in both sexes.] The crab-hole mosquito, found in coastal areas 

 of southern Florida Deinocerites cancer 



15. Tip of abdomen blunt (fig. 17, B) , eighth segment visible, the cerci 



retracted or inconspicuous ; mesonotum covered with narrow lanceolate 

 scales or with hairlike scales (if very small species, covered with 

 broad, dark, appressed scales, see last half of couplet 42). [Post- 



spiracular bristles absent] Culex, Thcobaldia 17 



Tip of abdomen tapered (fig. 17, A), eighth segment usually retracted, 

 the cerci exserted. [Portspiracular bristles present.] 16 



16. Mesonotum with scattered broad, pale scales; abdominal segments with 



apical pale scaling. A bluish Psorophora (Janthinosoma) , which 

 lacks the white bands on the hind tarsi (see couplet 39) 



Psorophora cyanescens 



Mesonotal scales narrow, dark; abdomen usually with basal segmental 



bands that widen laterally. [Palpi short in both sexes.] Rare in 



South Aedes cinercus 



17. Medium-sized or small species ; wings and legs not speckled with white 



scales. [The two cross veins arising from vein 4 well separated.] 18 



A large species with unusually broad, lightly scaled wings; costa and 

 first vein, femur, and tibia sprinkled with white. [The two cross 

 veins in center of wing (arising from vein 4) separated by less than 

 the length of either one; dorsal surface of abdominal segments with 

 diffused pale scaling basally and laterally; spiracular bristles pres- 

 ent ; base of subcostal vein on under side of wing with a row of long 

 setae.] Rare in Florida but occasionally common elsewhere 



Theobaldia inornata 



18. Dorsal abdominal white bands or lateral spots basal when present 19 



Abdomen with narrow dorsal bands and (or) lateral spots of white 



scales on apical (posterior) margin of segments Culex apicalis 



19. Abdomen dorsally with conspicuous segmental bands of white scales. 



[Seventh segment without pale scales posteriorly; occiput with nar- 

 row, curved scales; outstanding wing scales narrow.] 20 



Abdomen unhanded dorsally or with narrow segmental bands (fairly 

 broad bands of yellowish scales sometimes present in C. salinarius) 21 



20. Abdominal bands continuous to lateral margin, posterior borders some- 



what irregular but not evenly rounded ; mesonotum usually with a 

 pair (sometimes two pairs) of small dots of whitish scales near the 

 middle (fig. 12, K) ; mesonotal vestiture mostly of fine, brownish, 

 hairlike scales except on spots and around margins, where scales are 

 pale or grayish and somewhat coarser: second marginal cell long, 

 usually four or five times as long as its petiole. The white-dotted 

 Culex; rare in southern Florida, but sometimes plentiful in other 



sections Culex restuans 



Abdominal bands with a rounded posterior border (usually most typical 

 on segments 3 to 5) and the bands interrupted or much narrowed at 

 lateral margin of segments ; mesonotum without white dots ; mesonotal 

 vestiture of narrow, curved or lanceolate scales, pale brown or grayish 

 and having a coarse appearance; second marginal cell usually two 

 and a half to three times the length of its petiole. The southern house 



mosquito Culex quinquefasciatus 



(In Culex pipiens, which may be encountered in the northern part 

 of the region covered in this publication, the scales of the mesonotum 

 are similar to those of quinquefasciatus but the abdominal bands and 

 the length of the second marginal cell are similar to those of restuans. 

 The differences in male characters are given in the appended key of 

 Culex terminalia.) 



21. Wings with all outstanding scales long and slender (fig. 19, A) ; occiput 



(top part of head back of eyes) without flat scales ; mesonotum with 

 very fine dark-brown hairlike scales. Medium-sized species 22 



