WYEOMYIA ABIA 113 



and prominent, well separated, clothed with dark scales, the apex silvery scaled as 

 also the base below; mesonotum and scutellum clothed with brownish and blackish 

 scales which show a bluish luster, setae of the scutellum brown; metanotum deep 

 brown with a group of setae towards the apex; abdomen compressed, black scaled 

 above, beneath creamy white, the colors separated in a straight line on the sides; 

 legs dark with metallic luster, brassy beneath, the middle legs with the tip of the 

 second and succeeding joints silvery white on the inner side; wings with the scales 

 of the veins short and broad on the outer half. Length, 3.5 mm. 



One specimen, Tabernilla, Canal Zone, Panama (August Busck, collector), bred 

 from a pupa found in a bamboo joint. 



Type. No. 10860, U. S. National Museum. 



Descbiption of Female of Wyeomyia hosautus (Male and Larva Unknown) : 



Female. Proboscis rather short, swollen apically, vestiture black, with vio- 

 laceous and bronzy reflection; labellse small, rounded, with fine outstanding 

 setffi. Palpi short, flattened, one-sixth as long as proboscis, bronzy black. 

 Antennas moderate, the joints slender, subequal, rugose, coarsely pilose, black ; 

 tori subspherical, with a cup-shaped apical excavation, blackish, slightly prui- 

 nose; hairs of whorls long, rather sparse, black, Clypeus rounded, convex, 

 blackish, pruinose. Eyes separated at vertex by a narrow wedge, bluish black. 

 Occiput clothed with flat brown scales with iridescent metallic reflection, a 

 white patch at the sides below ; two long setae at vertex and a row of short ones 

 along margins of eyes. 



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

 with a white tip and base ; a row of setae along anterior margin. Mesonotum 

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

 scales below lateral angles and on front margin whitish ; bristles over roots of 

 wings dark brown. Scutellum trilobate, with vestiture similar to and con- 

 tinuous with that of mesonotum, each lobe with a small tuft of black bristles. 

 Postnotum elliptical, prominent, a broad, low median carina, dark-brown, a 

 group of small setae near posterior margin. Pleurae dark brown, the 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 bronzy and blue 

 reflection ; venter yellowish white, colors separated at the sides in a straight line. 



Wings moderate, hyaline; petiole of second marginal cell less than one-half 

 as long as its cell, that of second posterior cell slightly longer than its cell; 

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

 of veins rather broadly ligulate, dense and ovate on second to fourth and tip 

 of fifth veins ; black, with bronzy reflection on the costa. Halteres whitish with 

 black knobs. 



Legs rather long and slender, black with bronzy and blue reflection, femora 

 whitish beneath; tibia with pale-brassy luster beneath; brighter on fore tibiae 

 and their tarsi; hind tarsi bronzy beneath; mid tarsi with the apical two-thirds 

 of second and all of succeeding joints silvery yellowish white on outer side; 

 hind tarsi with fourth and fifth joints white beneath except at their tips. Claw 

 formula, 0.0-0.0-0.0. 



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



The larvae live in the water in broken bamboo-joints and in similar locations. 



Panama. 



Tabernilla, Canal Zone, a single specimen, bred from a pupa found in a 

 bamboo- joint (A. Busck). 



WYEOMYIA ABIA Dyar & Knab. 



Wyeomyia ochrura Dyar & Knab (in part), Journ. N. Y. Ent. Soc, xiv, 227, 229, 1906. 

 Wyeomyia abia Dyar & Knab, Proc. U. S. Nat. Mus., xxxv, 67, 1908. 

 Wyeomyia abia Theobald, Mon. Cullc, v, 626, 1910. 



8 



