138 MOSQUITOES OF NORTH AMERICA 



tion, brown, with whitish pruinosity; hairs of whorls long, rather abundant, 

 black. Clypeus rounded, convex, luteous brown, pruinose. Eyes separated at 

 vertex by a narrow wedge, bluish black. Occiput clothed with flat brown 

 scales with a bronzy and blue reflection, a small white spot at the vertex, a 

 white patch below, a white border along the eyes not attaining the vertex ; two 

 setse on the vertex and smaller ones along margins of eyes. 



Prothoracic lobes elliptical, well separated, clothed with flat scales, black 

 with a blue reflection; a row of setse along the anterior margin. Mesonotum 

 clothed with elliptical, flat brown scales, with a bronzy and blue reflection; 

 scales below the lateral angles and some on front margin whitish; setae at 

 roots of wings black. Scutellum trilobate, with the vestiture similar to and con- 

 tinuous with that of mesonotum, each lobe with a small tuft of black bristles. 

 Postnotum elliptical, prominent, an obscure median carina, dark brown, a group 

 of small setse near posterior margin. Pleurae dark brown, coxas luteous, clothed 

 with elliptical, flat silvery-white scales. 



Abdomen subcylindrical, expanded apically and with many long, dark-brown 

 terminal setae ; dorsal vestiture black, with a slight metallic reflection ; venter 

 yellowish white, the colors separated at the sides in a straight line. 



Wings moderate, hyaline; petiole of second marginal cell one-third as long 

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

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

 outstanding scales of veins long, ligulate, denser and rather narrowly ovate on 

 second and fourth veins outwardly, black, with a blue reflection on costa. 

 Halteres whitish with black knobs. 



Legs rather long and slender, black wdth bronzy and blue reflection, femora 

 whitish beneath; tibise and tarsi of front and hind legs with a bronzy luster 

 beneath ; of the mid legs with a paler luster, tips of second tarsal, the third 

 and fourth white on the outer side. Mid tarsi with two claws, unequal, sub- 

 opposed, those of hind tarsi small, subequal; claw formula, 0.0-0.0-0.0. 



Length : Body about 2.5 mm. ; wing 3.5 mm. 



Genitalia (plate 4, fig. 24) : Side-pieces over twice as long as wide, the tips 

 conically tapered; three setae in a line towards base; basal lobes rounded tri- 

 angular, setose, Clasp-filament with a long, slender stem, the tips expanded 

 into a lobed clasp ; middle lobe very broad, with a truncate tip, one angle of which 

 IS expanded into a short subquadrate limb, both it and the tip fringed with 

 setag ; outer lobe a small, broad appendage with dentate tip and a row of setae ; 

 inner lobe small, and bearing a stout, erect spine. Harpes rather slender, bent 

 at the tip and obscurely dentate. Harpagones and unci forming small basal 

 cones. Basal appendages represented by two stout setae on each side. 



Larva, Stage IV (plate 91, fig. 292). Head rather squarely rounded, nearly 

 straight on sides, a slight notch at insertion of antennae, front margin arcuate, 

 ante-antennal tuft multiple. Antennae small and slender, with a fine tuft at 

 outer third ; at tip, a long spine, three shorter ones, and a long digit with a basal 

 branch. Mental plate triangular, with a long, prominent central tooth and 

 eleven evenly spaced ones on each side, the basal one smaller and sharper. 

 Mandible quadrangular, with slight spines outwardly towards base; a filament 

 from a notch before tip ; an outer row of cilia from a collar ; a row of promi- 

 nences on outer margin with divided tips ; dentition of four teeth on a process, 

 the first the longest; a spine before, a double tooth at base, a short filament 

 and a row of slender processes with di"vdded tips within ; process below short, 

 widely furcate, taking the place of the basal angle, a row of hairs along margin 

 and a tuft at tip of each limb ; a row of hairs within and one at base. Maxilla 

 elongate hemispherical, divided by a weak suture; inner half with a row of 



