562 MOSQUITOES OF NORTH AMERICA 



ish, clothed with milk-white scales; fore and hind coxae pale testaceous, with 

 white scales and many pale bristles ; mid coxae brown, with a few white scales. 



Abdomen subcylindrical, flattened, tapered posteriorly, cerci prominent, pro- 

 jecting; dorsal vestiture of deep violet-blue scales, sides with large apical, tri- 

 angular, yellowish-white spots, largest on sixth segment; venter yellowish- 

 white scaled, the sixth segment violet-blue scaled at base, the seventh entirely 

 violet blue. 



Wings rather large and ample, membrane faintly infuscated, more distinctly 

 so towards costa; petiole of second marginal cell much shorter than the cell, 

 that of second posterior cell about as long as its cell ; basal cross-vein consider- 

 ably less than its own length from anterior cross- vein ; veins dark brown ; scales 

 brown with a violet luster, the outstanding ones on apical half of wing broadly 

 linear or ligulate. Halteres yellowish, the knobs white scaled. 



Legs rather long and slender; femora yellowish basally, hind pair clothed 

 with yellowish-white scales to apical third, which is deep violet; mid femora 

 deep- violet scaled nearly to base ; knees narrowly silvery white scaled ; tibiae and 

 tarsi deep violet scaled with metallic luster ; scales on hind tibiae and first two 

 tarsal joints roughened ; last two joints of hind tarsi white, and sometimes also 

 the apex of the third joint. Claw formula, 1.1-1.1-1.1. 



Length : Body about 4.5 mm. ; wing 4 mm. 



No specimens of the male are before us. 



Male genitalia (plate 21, fig. 147) : Side-pieces nearly three times as long as 

 wide, tips conically tapered. Clasp-filament much swollen on outer two-thirds, 

 tip small, with a terminal claw. Harpes concave with revolute inner margin, 

 tip bent and minutely dentate. Harpagones with long slender stem, tip ex- 

 panded and bearing six setae and two curled filaments. Unci forming a basal 

 cone. 



Life history unknown. The habits of the adults are as in Psorophora sayi. 



Egg (plate 146, fig. 673). — Fusiform, somewhat flattened on one side, rather 

 long; sculpture of elongate, hexagonal reticulations, from the micropylar end 

 of each arises a stout recumbent spine, about two-thirds the length of the 

 reticulation. 



Southern United States. 



Victoria, Texas, May, 31 (W. E. Hinds) ; Cypress Bayou, Texas, August 33, 



1903 (J. D. Mitchell) ; Greenville, Texas, June 30, 1904 (H. S. Barber) ; Dallas, 

 Texas, June 24, 1904 (H. S. Barber) ; Westpoint, Mississippi, August 11, 1904 

 (H. S. Barber) ; Corinth, Mississippi, August 14, 1904 (H. S. Barber) ; Jack- 

 son, Mississippi, August 8, 1904 (H. S. Barber) ; Vanburen, Arkansas, July 6, 



1904 (H. S. Barber) ; Fort Smith, Arkansas, July 8, 1904 (H. S. Barber) ; 

 Little Roclc, Arkansas, July 11, 1904 (H. S. Barber) ; Danville, Arkansas, July 

 10, 1904 (H. S. Barber) ; Helena, Arkansas, July 30, 1904 (H. S. Barber) ; 

 Scott, Arkansas, July 11, 1908 (J. K. Thibault, Jr.) ; Chattanooga, Tennessee, 

 July 27, 1904 (H. S. Barber) ; Wister, Indian Territory, July 2, 1904 (H. S, 

 Barber) ; Woodstock, Virginia, August 4, 1904 (F. C. Pratt) ; Plummer's 

 Island, Maryland, July 18, 1904 (E. P. Currie) ; Washington, District of Co- 

 lumbia, July 31, 1909 (T. Pergande). Also recorded from Fort Logan H. 

 Eoots, Arkansas (Theobald). 



The only male specimen of this species which we have had was dissected by 

 Dr. E. P. Felt and unfortunately destroyed, so that we have been unable to pre- 

 pare a description of that sex. This species has been generally confused with 

 Psorophora lutzii. While it agrees in the central dark stripe of the mesonotum 

 and the tarsal coloration, there are obvious and constant differences between 

 the two. 



