328 [MOSQUITOES OF NORTH AMEEICA 



white basal segmental bands above, the eighth segment entirely white scaled. 

 Length, 3.5 mm. 



Eight specimens, Tabernilla, Canal Zone, Panama (August Busck, collector), 

 bred from larvse in water in bamboo joints. 



Type. No. 10873, U. S. National Museum. 



Allied to C. hesitator D. & K., described below, but differing in the shape of the 

 wing-scales. 



Description of Female, Male, and Larva of Cijlbx equivocator: 



Female. Proboscis long and slender, somewhat enlarged towards apex, 

 labellge conically tapered; vestiture black with a bronzy and blue reflection, 

 labellas pale with small outstanding setae. Palpi short, one-fifth as long as 

 proboscis, blackish brown. Antennse moderate; joints subequal, rugose, pilose, 

 black: hairs of whorls sparse, moderate, black; tori subspherical with a cup- 

 shaped apical excavation, yellowish brown. Clypeus rounded triangular, dark 

 brown, nude. Eyes black. Occiput black, clothed Avith narrow, curved bronzy- 

 brown scales on vertex, flat whitish ones on lower part of sides, and numerous 

 erect, forked black ones on vertex, margin of eyes silvery-white scaled. 



Prothoracic lobes elliptical, remote dorsally, brown, clotlied with pale scales 

 and dark bristles. Mesonotum dark brown with two narrow impressed bare 

 lines; vestiture of narrow, curved golden-brown scales and stiff dark-brown 

 bristles. Scutellum trilobate, with similar but paler vestiture to mesonotum, 

 each lobe with a tuft of dark-brown bristles. Postnotum elliptical, prominent, 

 dark brown, pruinose, nude. Pleura greenish luteous, coxae luteous, a few 

 narrow, elliptical white scales and pale bristles. 



Abdomen subcylindrical, depressed, truncate at tip : dorsal vestiture of brown- 

 black scales with a slight bronzy reflection, the second segment with a narrow, 

 transverse yellowish-white basal band ; a row of lateral segmental basal yel- 

 lowish-white triangular spots; venter yellowish-white scaled, tips of segments 

 blackish, with yellowish hairs. 



Wings ample, hyaline ; petiole of second marginal cell less than one-fourth as 

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

 cross-vein distant about its own length from anterior cross-vein ; scales of veins 

 long, dense, the outstanding ones broadly linear, brown, with blue reflection on 

 costa, densest on forks of second and fourth veins and apical half of third. 

 Halteres whitish, with black knobs. 



Legs moderate, femora whitish beneath except at tip ; tibiae and tarsi black, 

 tarsi with a bronzy and blue reflection, paler beneath, tips of tibise whitish ; a 

 patch of white scales at base of first hind tarsal joint. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3 mm. ; wing 3.5 mm. 



Male, Proboscis straight, slightly and gradually enlarged apically. Palpi 

 exceeding proboscis by nearly the length of last joint, slightly enlarged towards 

 apex, end of long joint and the last two joints with long, dense black hairs; 

 vestiture of bronzy scales, without annulations. Antennae plumose; last two 

 joints long and slender, rugose, pilose, black, the others short, whitish, with 

 black rings at insertions of hair- whorls; hairs long, dense, black. Coloration 

 similar to the female. Wings much narrower, the stems of the fork-cells longer. 

 Abdomen long, slender, somewhat widened towards apex; segments dorsally 

 with narrow whitish bands at their bases, last segment entirely pale scaled; 

 tip with numerous coarse bristles ; lateral ciliation coarse, rather sparse. Claw 

 formula, 1.1-1.1-0.0. 



Length : Body about 4 mm. ; wing 3 mm. 



Genitalia (plate 15, fig. 106) : Side-pieces over twice as long as wide, tips 

 bluntly conical ; inner lobe at outer third, stout, quadrate, bearing a leaf -like 

 appendage, three rods and a stout seta; clasp filament stout, curved, slightly 

 larger at base, with a stout, short terminal claw. Harpes divided, inner limb 



