WYEOMYIA SYMMACHUS 143 



tion. Abdomen black-scaled, with bluish iridescence, white beneath, the colors sepa- 

 rated on the sides in a straight line. Legs bronzy brown, the femora pale beneath; 

 hind tarsi with the last two joints white-scaled beneath nearly to their apices; mid 

 tarsi with the apical three-fourths of the second, and all of the succeeding joints 

 silvery white-scaled beneath; fore legs dark. Wing-scales broad. 



Male. Unknown. 



Two specimens, bred from larvae in water in bamboo joints, Tabernilla, Canal Zone, 

 Panama (A. H. Jennings). 



Type no. 12056, U. S. N. M. 



Originax, Description of Wyeomyia euethes : 



Female. Proboscis rather short and stout, distinctly swollen at the tip. Occiput 

 dark-scaled, the eyes with a narrow white margin. Prothoracic lobes dark, white 

 below, without a distinct white tip. Abdomen dark above, white below, the colors 

 separated on the sides in a straight line. Wing-scales large, ovate. Legs black, the 

 mid tarsi with the tip of the second, the third to fifth joints white below, hind tarsi 

 with the fourth and fifth joints white below except at tip. 



One specimen, Tabernilla, Canal Zone, Panama (A. Busck). 



Type no. 12134, U. S. N. M. 



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



Female. Proboscis moderate, the tip expanded, the labellse small, rounded, 

 with fine outstanding setaj; vestiture bronzy black. Palpi short, flattened, one- 

 sixth as long as proboscis, bronzy black. Antennae moderate, the joints sub- 

 equal, coarsely pilose, black ; tori subspherical, with a cup-shapel apical excava- 

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

 Clypeus rounded, convex, blackish, 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 white spot at the vertex and a large white 

 spot at lower part of side ; a narrow white margin running up along the eye, not, 

 but nearly attaining the vertex; two long setae at the vertex and smaller ones 

 along margin of eyes. 



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

 with bronzy luster, a silvery patch at base ; a row of setffi on anterior margin. 

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

 reflections, scales below lateral angles silvery gray, some white ones on 

 anterior margin ; bristles over roots of wings dark brown. Scutellum trilobate, 

 with vestiture similar to and continuous with that of mesonotum, each lobe 

 with a small tuft of black 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 hairs ; 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 less than half 

 as long as its cell, that of second posterior cell about equal to its cell; basal 

 cross-vein distant less than its own length from anterior cross- vein; scales of 

 wing beyond cross-veins broadly cuneiform, with subtruncate apices, dense, 

 black, with a blue reflection on costa. Halteres pale with black knobs. 



Legs rather long and slender, black with a bronzy reflection, femora whitish 

 beneath ; tibiae and tarsi of front and middle legs bright brassy beneath ; mid 

 tarsi with outer two-thirds of second and all of the succeeding joints silvery 

 white on outer side ; hind tarsi bright bronzy beneath, the last two joints silvery 

 beneath, except at their tips. Claw formula, 0.0-0.0-0.0. 



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



