580 MOSQUITOES OF NORTH AMERICA 



of six stout setse of various shapes, the short ones with curved tips. Unci con- 

 tiguous, forming a conical plate with narrowly cleft tip. 



Larva, Stage IV (see figure of the entire larva, plate 58). Head rounded, 

 wider than long, a wide notch at insertion of antennge, front margin broadly 

 arcuate. Antennae large, bent sharply at basal third, again less sharply at distal 

 third, swollen without, tip tapered; spined all over, most densely so at base; 

 a large tuft near middle ; an angular projection at outer third from which arise 

 two lono- hairs ; a single hair and two slender digits at tip. Eyes large, trans- 

 verse, pointed at ends. Both pairs of dorsal head-hairs single, ante-antennal 

 tuft double. Mental plate triangular, about as long as wide, central tooth broad 

 and rounded, with eight teeth on each side, becoming smaller basally, the last 

 very small. Mandible quadrangular, smooth without ; two filaments near tip ; 

 an outer roAV of stout cilia ; four little tufts on prominences on outer margin ; 

 dentition of five teeth on a slight prominence, first and fourth longer; a long 

 filament without, three short teeth at base, two short filaments and a seta within ; 

 process below bent, furcate at tip, one fork very slender, with patches of hair ; 

 basal process smooth; ten setag at base. Maxilla elongate, rounded, narrower 

 without, divided by a suture; inner half shortly haired basally; a long fringe 

 of hair along suture for over half its length ; outer half with two basally placed 

 digits and a subapical spine. Palpus very small, with two digits only. Thorax 

 rounded, wider than long; hairs abundant, subdorsal, prothoracic ones single 

 and as long as head. Abdomen stout, the segments nearly equal ; lateral tufts 

 multiple on first two segments, triple on third, double on fourth and fifth, absent 

 on sixth, long and single on seventh ; long, single, subdorsal hairs on third to 

 seventh segments; tracheal tubes very narrow, strongly flexuous. Air-tube 

 small, slightly inflated at base, subconstricted at outer third, three times as long 

 as wide ; pecten reaching halfway, of few large remotely spaced teeth, the single 

 tooth trifurcate outwardly, with smaller branches below, the shaft smooth; a 

 large tuft beyond middle of tube and beyond pecten. Lateral comb of eighth 

 segment of six scales joined by a basal chitinous band ; single scale three times 

 as long as wide, with a long terminal spine, a long, curved subapical one, the 

 sides fringed with smaller spinules. Anal segment as long as wide, ringed by 

 the plate ; dorsal tuft a group of four hairs on each side ; a single long lateral 

 hair ; ventral brush of rather sparsely placed long-stemmed tufts reaching half- 

 way up the ventral line. Anal gills very long, three times as long as the seg- 

 ment, regularly tapered to a sharp tip, each with a very stout, dark colored, 

 irregularly flexuous central trachea. 



Egg (plate 146, fig. 674). Fusiform, black, reticulate, spinose, the spines 

 recumbent, pointing towards the micropylar end and about two-thirds the 

 length of the reticulations. 



The larvaj live in temporary ground-pools and develop rapidly. They gen- 

 erally lie upon the bottom on their backs with the mouth-brushes in action. 

 Mr. Barber captured several adults which came to bite, as we suppose. The 

 males swarm ; we have specimens from Mr. Tucker taken from a swarm. 



Southern United States to southern Mexico. 



Delair, New Jersey, June 28 (W. P. Seal) ; Washington, District of Co- 

 lumbia, September 9, 1901 (J. Kotinsky) ; Grassymead, Virginia, May 24 (H. 

 G. Dyar) ; Clarksdale, Mississippi, July 31, 1904 (H. S. Barber) ; Belzona, 

 Mississippi, August 4, 1904 (H. S. Barber) ; Westpoint, Mississippi, August 13, 

 1904 (H. S. Barber) ; Baton Eouge, Louisiana (J. W. Dupree) ; Piano, Texas, 

 May, "swarming at dusk'' (E. S. Tucker) ; Brownsville, Texas, May 9, 1904 

 (H. S. Barber) ; Willcox, Arizona, July 31, 1909 (A. K. Fisher), Tehuantepec, 

 Mexico, July 3, 1905 (F. Knab). 



