566 MOSQUITOES OF NORTH AMEEICA 



black ones on each side subdorsally; rather small, narrow, truncate, erect and 

 suberect golden-yellow scales on the occiput ; a row of black setae along margins 

 of eyes, a few yellow ones projecting at vertex. 



Prothoracic lobes elliptical, remote dorsally, clothed with broad, flat whitish 

 scales and brown bristles. Mesonotum deep brown, clothed with broad flat scales, 

 dark brown and golden yellow nearly evenly intermixed. Scutellum trilobate, 

 brown clothed with scales similar to those of the mesonotum, each lobe with a 

 group of black bristles. Postnotum elliptical, prominent, brown, nude. Pleurae 

 dark brown and luteous, densely clothed in the middle with flat silvery-white 

 scales : front and hind ooxas luteous, with patches of broad, flat white scales and 

 rows of brown bristles. 



Abdomen subcylindrical, tapering posteriorly, clothed above with submetallic 

 violet-blue scales, apices of segments with lateral triangular large yellow spots 

 reaching anterior borders of segments; first segment clothed dorsally with 

 brownish scales and with many pale setge ; venter entirely yellow scaled with a 

 metallic luster. 



Wings rather narrow, slightly infuscated, particularly towards the costa and 

 along basal portion of fourth vein ; petiole of second marginal cell more than 

 half as long as its cell, that of second posterior cell shorter than its cell ; basal 

 cross-vein distant less than its own length from anterior cross-vein; scales of 

 veins blaclcish, those on costa with a blue reflection, outstanding ones narrowly 

 lanceolate, densest on forks of second vein. Halteres pale, with darker white- 

 scaled knobs. 



Legs rather long, vestiture dark violet blue ; front and hind femora yellow at 

 bases and beneath nearly to tips; mid femora blue scaled to base; knees silvery- 

 white scaled ; tibiae and tarsi entirely smooth, blue black, last two joints of the 

 hind tarsi white above, fourth joint black-marked beneath in an interrupted 

 stripe, the black forming a very narrow apical ring at tip of joint. Claw 

 formula, 1.1-1.1-1.1. 



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



Male. Proboscis straight, slender, slightly thickened at apex. Palpi long, 

 exceeding the proboscis by nearly the length of the last two joints ; end of long 

 joint and last two joints somewhat thickened and bearing long blackish hairs ; 

 vestiture blue-black, a rather broad white ring devoid of scales at the false 

 articulation before middle of long joint. Antennae plumose; last two joints 

 blackish, ciliate, the others short, whitish, with blackish rings at insertions of 

 the hair-whorls; hairs of whorls long, moderately dense, black. Coloration 

 similar to the female. Wings narrower than in the female, the fork-cells shorter, 

 the vestiture sparser. Claw formula, 2.1-2.1-1.1. 



Length : Body about 4 mm. ; wing, 3.5 mm. 



Genitalia (plate 21, fig. 148) : Side-pieces about twice as long as wide, 

 the tips conically tapered; clasp-filament broadly expanded in the middle, 

 a short, stout, inserted terminal spine. Harpes concave, with revolute margins, 

 the tips pointed and bent. Harpagones long, far exceeding the harpes, their 

 tips narrowly expanded, bearing a row of stout setge and two terminal filaments, 

 one disk-shaped, the other curled. Unci forming a long-pointed basal cone. 



Life history and habits unknown. 



Cuba. 



San Cristobal (J. H. Pazos) ; Vuelta-Abajo (J. H. Pazos). 



We have been obliged to credit the authorship of this species to Dr. Pazos, 

 since he published a photograph of it, together with the manuscript name, which 

 had been sent him, in advance of the appearance of the description by Dyar and 

 Knab. The general coloration is very similar to Psorophora sayi, but the 

 absence of suberect scales from the hind tibiae and tarsi will at once distin- 

 guish it. 



