THE MOSQUITOES OF THE SOUTHEASTERN STATES 77 



Palmate hairs on segment 3 with broad leaflets, usually notched or ser- 

 rated on outer half and about equal in size to those on segments 

 4 to 6. [Antepalmate hairs on segments 4 and 5 usually double 

 (except specimens from central Florida, in which they are usually 

 single) .] A. punctipennis 



URANOTAENIA 



19. Upper lateral hair of abdominal segments 1 and 2 double U. lowii 



Upper lateral hair of abdominal segments 1 and 2 triple (lower hair 



single in both species) U. sapphirina 



MANSONIA 



20. Anal segment with ventral tufts piercing the sclerotic ring; antenna 



with two long hairs from a notch beyond the tuft, extending to end 



of antenna ; lateral spine of maxilla serrate M. titillans 



Anal segment without ventral hair tufts piercing the sclerotic ring ; 

 antenna with two short hairs from a notch beyond tuft, extending 

 less than halfway to tip; lateral spine of maxilla smooth 



M. perturbans 



OBTHOPODOMYIA 



21. Segments 7 and 8 of abdomen each with a large sclerotic plate (a much 



smaller one usually present also on segment 6). [Lateral hairs of 

 abdominal segments 1 and 2 comparatively short, multiple; tuft of 

 air tube with many branches; anal segment ringed by the plate, 



the lateral hair single.] 0. signifera 



Abdominal segments without sclerotic plates. [Lateral hairs of seg- 

 ments 1 and 2 double or triple, long; tuft of air tube with three or 

 four hairs; anal segment not completely ringed by the plate, the 

 lateral hair double or triple.] 0. alba 



CULEX ; THEOBALDIA 



22. Both upper and lower head hairs multiple, long. [Comb of many 



scales in a patch.] 23 



Upper and lower head hairs not both multiple 29 



23. Air tube with hair tufts or a few single hairs beyond pecten, none 



at base Culex (Culex) 24 



Air tube with a pair of multiple hair tufts at base ; pecten with a 

 short row of strong teeth, followed by a row of long setae (fig. 23, 

 C) ; air tube stout, about 3:1 T. inornata 



24. Antenna uniform in shape, the hair placed near, middle 25 



Antenna with the hair tuft placed in a constriction at outer third, 



the part beyond the tuft more slender 26 



25. Antennal hair single ; upper and lower head hairs triple ; air tube about 



2y 2 : 1, with four pairs of ventral tufts C. corniger 



Antennal hair multiple ; upper and lower head hairs with five or six 

 branches ; air tube about 4 : 1, with two or three pairs of long, single 

 hairs irregularly placed and one pair of small, subapical tufts, usually 

 triple C. restuans 



26. Air tube with four or five pairs of hair tufts beyond pecten, the subapical 



pair laterally out of line (fig. 20) ; hairs usually little, if any, longer 



than diameter of tube 27 



Air tube with five pairs of long, feathered tufts, the proximal pair attached 

 before end of pecten, none out of line. [Air tube about 4:1.] 



C. tar sails 



27. Air tube long and slender, 7-8 : 1, sides nearly parallel ; frontal head 



hairs usually with three or four branches 28 



Air tube stouter, about 4:1, head hairs usually with five or more 



branches 0. quinquefasciatus 



(The larva of Culex pipiens, which may be encountered in the 

 northern part of the region covered in this publication, is similar to 

 that of quinquefasciatus. It differs usually in having the subdorsal 

 hairs of abdominal segments 3 to 5 double instead of single, although 

 these hairs are subject to variation in both species.) 



