WYEOMYIA CHRESTA 139 



short, stout spines on margin and dense cilia within ; a tuft of hairs at tip and 

 a long, articulated spine; outer half with a single filament at outer fourth and a 

 band of hair between it and base of palpus ; a short spine on margin from a 

 slight notch. Palpus small, with four rudimentary digits. Thorax rounded, 

 wider than long; abdomen moderate, anterior segments shorter; lateral hairs 

 in fours on second segment, in twos on third to sixth, single on seventh ; short 

 hairs in stellate tufts. Air-tube straight, tapered on outer half, over five times 

 as long as wide; two irregular rows of single hairs and a triple tuft near base 

 behind. Lateral comb of eighth segment of twenty-two spines in a straight 

 row ; single spine elongate, with a pointed tip, very faintly fringed with spin- 

 ules. Anal segment longer than wide, with a dorsal plate reaching well down 

 the sides ; dorsal tuft of two long hairs on each side ; a single, long lateral hair ; 

 a stout stellate subventral tuft. Anal gills four, subequal, longer than the 

 segment, bluntly pointed. 



The larvae live in water in the leaves of epiphytic Bromeliacese. Mr. Urich 

 obtained them associated with Wyeomyia trinidadensis, Wyeomyia autocratica, 

 and Culex imitator. 



Trinidad, British West Indies (F. W. Urich) . 



Our specimen was at first determined as Wyeomyia quasiluteoventralis and 

 later the larva was made the basis of the name Wyeomyia telestica. Dr. Howard 

 has examined the type of Wyeomyia quasiluteoventralis, and reports that it has 

 coppery-golden prothoracic lobes. It therefore has nothing to do with the 

 present species, which has black lobes. 



WYEOMYIA CHRESTA Dyar & Knab. 



Wyeomyia chresta Dyar & Knab, Smiths. Misc. Colls., quart, iss., lii, 263, 1909. 

 Wyeomyia adelpha Busck (not Dyar & Knab), Smiths. Misc. Colls., quart, iss., lii, 72, 

 1908. 



Original Description of Wyeomyia chresta: 



Female. Proboscis rather long and slender, distinctly swollen at the tip. Occiput 

 dark-scaled, the eyes with a narrow white margin, interrupted subdorsally. Pro- 

 thoracic lobes dark, white below; abdominal colors separated on the sides in a 

 straight line. Wing-scales large, ovate. Legs black, the mid tarsi with tip of second 

 joint, third and fourth white below, hind tarsi with bases of second and third nar- 

 rowly white, fourth and fifth white below except at tips. 



Two specimens, Tabernilla, Canal Zone, Panama (A. Busck). 



Type no. 12135, U. S. N. M. 



Description of Female, Male, and Larva of Wyeomyia chresta: 



Female. Proboscis rather slender, the tip expanded, the labellae small, 

 rounded, with fine outstanding setge; the vestiture black, with bronzy luster, 

 beneath with bright bronzy luster nearly to the tip. Palpi short, flattend, 

 one-seventh as long as proboscis, bronzy black. Antennae moderate, the joints 

 slender, subequal, rugose, coarsely pilose, black; tori subspherical, with a cup- 

 shaped apical excavation, brown with, whitish pruinosity ; hairs of whorls long, 

 rather sparse, black. Clypeus rounded, subtruncate in front, convex, dark 

 brown, pruinose. Eyes separated at the vertex by a narrow wedge, bluish 

 black. Occiput clothed with flat brown scales with a bronzy and blue reflection, 

 a small metallic spot at the vertex and a large white spot at lower part of side, 

 a narrow white margin running up along the eyes, not attaining the vertex ; two 

 setae at vertex and smaller ones along margins of eyes. 



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

 with bronzy luster, a row of setse on the anterior margin. Mesonotum clothed 

 with elliptical, flat dark-brown scales with bronzy and blue reflections; scales 

 below the lateral angles silvery gray, some white ones on anterior margin; 

 bristles over roots of wings dark brown. Scutellum trilobate, with the vestiture 



