WYEOMYIA ABRACHYS 141 



reaching well down the sides ; dorsal tuft of two long hairs on each side ; lateral 

 hair single, long, arising from angle of plate; subventral tuft short, multiple. 

 Anal gills about as long as the segment, stout, with rounded tips, equal. 



The larvffi live in water between the leaves of epiphytic Bromeliaceas. Mr. 

 Busck found the larvae " in true Bromelia water on a calabash tree near town." 



Panama. 



Tabernilla, Canal Zone, July 33, 1907, larvae in bromelia water (A. Busck). 



WYEOMYIA ABRACHYS Dyar & Knab. 



Wyeomyia airachys Dyar & Knab, Smiths. Misc. Colls., quart, iss., lii, 262, 1909. 



Original Description of Wyeomyia abrachys: 



Female. Proboscis rather long, distinctly swollen towards the tip. Occiput dark- 

 scaled, the eyes with a narrow whitish margin. Prothoracic lobes black above, the 

 tips shining but not distinctly white, the lower part white-scaled. Abdomen dark 

 above, white below, the colors separated on the sides in a straight line. Wing-scales 

 narrow, spatulate, broader and denser at the tip. Legs black-scaled, the mid tarsi 

 with the fourth joint distinctly white beneath in the female, the third and fourth 

 joints white in the male, hind tarsi v/ith white bands at the bases of the second and 

 third joints, the fourth and fifth white below except at tip. 



Three specimens, Caldera Island, Porto Bello Bay, Panama (A. H. Jennings). 



Type no. 12133, U. S. N. M. 



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



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

 with fine outstanding setae ; vestiture black with bronzy luster, beneath with a 

 brassy luster nearly to tip. Palpi short, flattened, one-seventh as long as 

 proboscis, bronzy black. Antennas moderate, the joints slender, subequal, 

 coarsely pilose, black; tori subspherical, with a cup-shaped apical excavation, 

 brown, with whitish pruinosity; hairs of whorls long, rather sparse, black. 

 Clypeus rounded, 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 the vertex and smaller ones along 

 margins of eyes. 



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

 with a bronzy luster, a pale reflection at tip, the base silvery scaled ; a row of 

 setae on anterior margin. Mesonotum clothed with elliptical, flat dark-brown 

 scales with bronzy and blue reflection ; scales below lateral angles silvery gray, 

 some white ones on anterior margin ; bristles over roots of wings dark brown. 

 Scutellum trilobate, \vith vestiture similar to and continuous with that of 

 mesonotum, each lobe with a small tuft of dark-brown bristles. Postnotum 

 elliptical, prominent, with a broad, low, median carina, dark brown, a group 

 of small setae near posterior margin. Pleurae dark brown, coxae luteous, clothed 

 with elliptical, flat silvery-white scales. 



Abdomen subcylindrical, compressed, truncate apically and with many long 

 dark-brown terminal setse ; dorsal vestiture black, with a slight metallic reflec- 

 tion; venter yellowish white, colors separated on sides in a straight line; the 

 scales somewhat raised along the mid-ventral line. 



Wings rather narrow, hyaline; petiole of second marginal cell one-third as 

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

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

 ligulate, becoming broader, denser and subcuneiform on apical half of forks 

 of second and fourth veins and outer part of third, black, with a blue reflec- 

 tion on the costa. Halteres whitish with black knobs. 



