306 MOSQUITOES OF NORTH AMERICA 



CULEX BISULCATUS (Coqmllett) Dyar & Knab. 



Micraedes bisulcatus Coquillett, Proc. Eint. Soc. Wash., vil, 185, 1906. 



Culex iisulcatus Dyar & Knab, Joum. N. Y. Ent. Soc, xiv, 208, 1906. 



Gulex Usulcatus Dyar, Proc. Ent. Soc, Wash., vlii, 18, 1906. 



Micraedes Usulcatus CoquUlett, U. S. Dept Agr., Bur. Ent, Tech. Ser. 11, 24, 1906. 



Culex bisulcatus Pazos, Sanidad y Ben., ii, 49, 558, 1909. 



Micraedes Usulcatus Theobald, Mon. Culic, v, 486, 1910. 



Oeigikai. Desceiptioit of Micsaedes bisxtlcatus : 



Scales of palpi and proboscis black, those of the occiput yellow. Mesonotum 

 brown-scaled, a pair of subdorsal bare lines on its anterior three-fourths. Abdomen 

 black-scaled, the front angles of the segments whitish-scaled. Scales of the legs 

 black, those on under side of femora basally whitish; claws of the front and middle 

 tarsi of the male with a tooth under one claw, none under the other, those of the hind 

 feet simple; female with all the claws simple. Scales of wings brown. Length 

 about 3 mm. 



Guadeloupe and Santo Domingo, West Indies. Two males and one female, collected 

 by Mr. A. Busck. 



Tjfpe. — No. 8291, U. S. National Museum. 



The larva differs widely from that of Aedes fuscus; the body bears many large 

 clusters of rather short, stiff hairs, and there are about eight tufts on the breathing 

 tube. 



DESCEIPTION of FBIfAXE, MAI.E, AKD LABVA OF CTJI.BX BISUtCATUS : 



Female. — Proboscis moderate, slightly swollen at apex, labellae conieally 

 tapered; vestiture black, with a purplish reflection throughout; setae minute^ 

 curved black, those on the labellae more prominently outstanding. Palpi long, 

 brown, two-fifths as long as proboscis, three-jointed, last joint longer than the 

 two preceding, with some outstanding setae at base. Antennae moderate, joints 

 subequal, rugose, pilose, black, second joint stout, swollen; tori subspherical, 

 with a cup-shaped apical excavation, pale, yellowish-brown within; hairs of 

 whorls sparse, black, and rather short. Clypeus triangular, convex, brown. Eyes 

 black. Occiput black, rather sparsely clothed with narrow, curv^, pale scales, 

 in middle, white along margin of eyes and lower parts of sides, many erect, 

 forked brown scales on vertex ; a row of bristles along margins of eyes. 



Prothoraeic lobes elliptical, remote dorsally, clothed with narrow, curved, pale 

 scales and brown bristles. Mesonotum pale brown, with two narrow, bare, im- 

 pressed lines; vestiture of coarse but rather sparse narrow, curved bronzy brown 

 scales; bristles brown, long. ScuteUum trflobate, pale, clothed with narrow 

 pale brown scales, each lobe with a group of brown bristles. Postnotum ellip- 

 tical, luteous, brown in the middle, nude. Pleurae pale luteous, with rows of 

 brown bristles. 



Abdomen subcyKndrical, depressed, truncate at tip, clothed dorsaUy with 

 black scales, with a slight bronzy and blue-metallic reflection, a row of lateral, 

 triangular, basal, segmental, dull-white spots ; venter clothed with dirty yeUow- 

 ish-white scales, tips of posterior segments blackish; apical part of abdomen 

 with coarse brown bristles. 



Wings moderate, hyaline ; petiole of second marginal cell nearly one-fourth as 

 long as its eeU, that of second posterior cell considerably shorter than its cell ; 

 basal cross- vein distant more than its own length from anterior cross-vein; 

 scales of veins brownish black, with blue luster on costa, long, linear. Halteres 

 white with black knobs, stems slender, the knobs large. 



Legs slender, rather long; femora black above, basally whitish beneath; tibiae 

 black, with bronzy and blue luster; tarsi black scaled, with bronzy and blue 

 reflection ; femora and tibiae both dark at tips. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3 mm. ; wing 3 mm. 



Male. — Proboscis straight, gradually enlarged towards apex. Palpi two-fifths 

 as long as proboscis, slender, uniform, without hairs, vestiture of brown scales, 

 without markings. Antennae with last two joints long and slender, rugose. 



