86 MOSQUITOES OF NORTH AMERICA 



black with a slight submetallic-blue reflection; venter silvery-white; colors 

 separated on sides in a nearly straight line. 



Wings moderate, hyaline ; petiole of second marginal cell 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 broadly linear, 

 brown with a bronzy reflection, denser and slightly broader on forks of second 

 vein and apices of third and fourth. Halteres largely blackish. 



Legs slender, black with a blue reflection, trochanters silvery white beneath, 

 femora whitish beneath ; tibiae and tarsi with a bronzy luster beneath ; mid tarsi, 

 with apex of second, all of third to fifth joints white-marked beneath; fore and 

 mid tarsi without white markings. 



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



Male. — Abdomen somewhat expanded towards apex, the tip with numerous 

 coarse brown bristles. Antennae scarcely distinguishable from those of the 

 female. Coloration as in the female, the middle legs with a strong brassy luster 

 beneath. Claw formula, 0.0-0.0-0.0. 



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



Genitalia (plate 3, fig. 15) : Side-pieces over twice as long as wide, much 

 tapering to the tips ; basal lobes narrowly triangular, setose ; three long setae in 

 a row. Clasp-filament stout, swollen beyond the base, tip expanded into three 

 lobes, the inner one long and slender, the middle one broad, conical, with hooked 

 tip and a row of setae, outer one curved and slender. Harpes slender, concave, 

 tips curved and obscurely toothed. Harpagones forming a broad cone. Unci 

 forming a similar but smaller cone. Basal appendages small, each with two 

 short, stifE setse. 



Larva, Stage IV (plate 87, fig. 274) . — Head rounded, with slight angles be- 

 hind eyes; antennae small, slender, a small two-haired tuft beyond the middle; 

 upper pair of dorsal head-hairs three-haired, lower two-haired and long. 

 Lateral abdominal hairs on third to seventh segments single. Air-tube over six 

 times as long as wide, gently tapered, more rapidly so at terminal fifth, with 

 evenly distributed single hairs, those nearest the base double or triple and 

 shorter ; terminal hooks small, straight. Comb of eighth segment of rather long 

 single spines in a dense row, becoming smaller ventrally; the hair behind the 

 comb single. Anal segment somewhat longer than wide, with a large dorsal 

 plate ; dorsal tuft of two long hairs on each side ; lateral hair at angle of plate 

 single; subventral tuft large, multiple, short. Anal gills equal, over twice as 

 long as anal segment, broadly ensiform. 



Mr. Busck collected the larvae in two instances in water between the leaves of 

 epiphytic bromeliads, Tillandsia sp., in a native village near Tabernilla. They 

 were associated with Wyeomyia cvrcumdncta, Culex jennmgsi, and Orthopodo- 

 myia phyllozoa. Mr. Jennings also collected the larvae in simUar locations at 

 Gatun and Porto Bello. 



Panama. 



Tabernilla, Canal Zone, larvae in leaves of bromelias, January 25, 1907, July 

 10, 1907 (A. Busck) ; Gatun, Canal Zone, larvae in a bromelia in a swamp, 

 August 11, 1908 (A. H. Jennings) ; Porto Bello, from a bromelia near the 

 alcalde's ranch, March 16, 1909 (A. H. Jennings). 



WYEOMYIA MELANOCEPHALA Dyar & Knab. 

 Wyeomyia melanocephala Dyar & Knab, Proc. Biol. Soc. Wash., xlx, 140, 1906. 

 Wyeomyia melanocephala Theobald, Men. Culic, v. 624, 1910. 

 Orioinai. Descbiption or Wtbx)mtia melanocephala: 



Prothoraclc lobes entirely dark bluish; head dark behind, without white margin 

 to the eyes; hind feet with the last two tarsal joints white. 



One specimen, Trinidad, B. W. I. (A. Busck). 



Type. — Cat. No. 9998, U. S. Nat. Mus. 



