CTJLISETA IMPATIENS 485 



of coarse hairs bordered outwardly by golden yellow scales, and traces of similar 

 sublateral ones near the base of the wings. Posterior portion of prothorax smooth, 

 bordered anteriorly by an irregular patch of golden yellow scales, with black hairs 

 intermixed. Scutellum crowned with long, black hairs and with somewhat irregular, 

 obsolete, submedian patches of golden yellow scales; postscutellum smooth, slaty 

 gray. Pleura sparsely clothed with irregular patches of silvery yellow scales. 

 Abdomen dark brown, with rather narrow, basal bands of silvery white scales; 

 sparsely clothed, specially laterally, with slender, golden yellow hairs. Basal portion 

 of clasp stout, thickly haired, yellowish brown; apical portion slender, uniformly 

 curved, yellowish brown. Ventral surface brownish black, that of the second, third 

 and fourth segments being sparsely clothed with silvery yellow scales, and each of 

 the latter with a distinct basal band of the same color. Wings hyaline; anterior 

 margin and first longitudinal vein rather thickly clothed with dark brown scales, 

 others with lighter colored ones; fringe slaty gray. Petiole of first submarginal 

 cell about equal in length to the cell, that of the second about one-fourth longer. 

 Posterior cross vein less than its own length from mid cross vein. Halteres, basal 

 portion pale yellowish white, apical portion capitate, dark brown. Coxae slaty gray, 

 golden yellow apically. Legs dark purplish brown, with apexes of femora and 

 tibiae clothed with golden yellow scales. Anterior and mid ungues uneven, one claw 

 bidentate, one unidentate, posterior simple. Posterior legs enormously prolonged; 

 tarsal segments extremely attenuate and fragile. 



Described from a freshly bred specimen July 14, 1904. 



Larva. Antenna rather stout, curved, with a thick, well developed tuft of plumose 

 hairs at its basal third and a pair of long, slender spines at the apical fifth, in 

 addition to one long spine and two rudimentary, tapering processes at the apex. 

 Labial plate subtriangular, with about 29 rather fine teeth, basal portion with dis- 

 tinct, rather coarse reticulations. Thoracic and anterior abdominal segments 

 clothed with numerous stout, black, plumose hairs, the other abdominal segments 

 bearing slightly compound, weakly plumose hairs. In addition, there are smaller 

 groups of compound hairs. The comb consists of a triangular patch of about 60 

 scales arranged in five irregular rows, each scale with a brown, basal, somewhat 

 spatulate enlargement and terminated by an expanded, nearly colorless tip bearing 

 a series of rather fine subequal, apical spines, smaller spines extend on each side 

 to the extreme base. Air tube about four times as long as wide, slightly infiated 

 and with two rows of pecten at the basal fifth, each consisting of about 14 closely 

 set teeth bearing at their bases one or two conspicuous processes; pecten extended 

 by a well marked row of about 16 simple bristles reaching to the apical fifth of the 

 air tube. There is a posterior pair of compound, plumose hairs at the base of the 

 air tube. Ventral tuft short and consisting of about 14 well developed, compound 

 hairs attached to the barred area, with three anterior. Dorsal tuft composed of a 

 single, stout, compound hair and a pair of very long, slender, simple hairs. 



Descbiption of Female, Male, and Larva of Culiseta impatiens: 



Female. — Proboscis long and slender, uniform; labellae elongate, gradually 

 tapering; vestiture entirely black. Palpi slender, short, about one-fifth the 

 length of proboscis; vestiture dark brown, some scales and the apex with a 

 yellowish-silky luster in certain lights. Clypeus flattened, roimded, brown, 

 faintly pruinose. Antennse filiform, slender; tori globose, dull chestnut, with 

 a patch of light scales within ; hairs of whorls short, sparse, black. Eyes black. 

 Occiput clothed sparsely with narrow, curved yeUowish-white scales, margin 

 of eyes very narrowly whitish, many erect, forked black scales dorsally; cheeks 

 clothed with broad, white scales; stiff black bristles near eye-margins. 



Prothoracic lobes small, lateral, with whitish scales and brown bristles. 

 Mesonotum deep-brown, clothed rather sparsely with small, narrow, curved, 

 bronzy brown scales, witii larger pale-yellowish scales scattered and in patches ; 

 a narrow, median, longitudinal pale line ; two very conspicuous sublateral, light 

 spots medianly on disk; behind each of these a light line, running nearly to 

 scuteUum; on the margin are some irregular light stripes which send out off- 

 shoots anteriorly, one of them in the form of a narrow line joins the discal spot; 

 anterior margin with three distinct yellowish-white spots; antescutellar bare 

 space margined with pale scales. ScuteUum clothed with yellowish-white scales 

 and with three groups of coarse dark bristles. Postnotum brownish, with a 



