URANOT-SINIA CALOSOMATA 923 



lateral margin a line of -white scales to the base of the wing; pleura brown with a 

 longitudinal stripe of white scales extending forward over the prothoracic lobe and 

 joining the stripe on the head; metanotum brown. Abdomen black scaled at the 

 sides, above clothed with ochreous yellow dull metallic scales, leaving a narrow 

 black line at the base of each segment, becoming broader on the terminal segments, 

 and a sub-basal median black spot; beneath with black vestiture and apical white 

 bands, which are broadest on the centers of the segments. Legs black with bronzy 

 and brassy luster, the apices of the femora white; on the hind legs the dilated apices 

 of the tibiae have a patch of white scales; hind tarsi with the third, fourth and fifth 

 joints white with metallic luster. Wings heavily dark-brown scaled on the costa, 

 the basal third of the first vein white scaled, the two forked cells small but broad, 

 the second posterior cell slightly longer than the second marginal cell. 



Length, 2.5 mm. 



Five specimens, Tabernilla, Canal Zone, Panama (August Busck, collector), bred 

 from larvae in prints of horses' feet containing water. 



Type. — No. 10866, TJ. S. National Museum. 



Descbiption op Female, Mate, and Labva of Ueanot^nia calosomata: 



Female. — Proboscis rather long and slender, distinctly enlarged towards tip ; 

 labellse small, conical, luteous ; vestiture of brownish-black scales. Palpi small, 

 slender, about twice as long as the clypeus, clothed with dull brownish scales 

 and with a few coarse setae. Antennae filiform, long, the joints subequal, rugose, 

 coarsely pilose, brown ; hairs of whorls sparse, moderate, black ; tori subspherical, 

 with a cup-shaped apical excavation, blackish-brown. Clypeus small but promi- 

 nent, rounded triangular, convex, depressed at base, dark brown, nude. Eyes 

 black. Occiput clothed with broad, flat, dull black scales and with very narrow 

 erect black scales, a row of broad, flat white scales along margins of eyes ; a tuft 

 of very long and narrow white scales projecting forward between eyes ; cheeks 

 white scaled; bristles along margins of eyes long, coarse, black. 



Prothoracic lobes elliptical, remote dorsally, with an oblique line of very 

 broad white scales and some coarse black bristles. Mesonotum dark brown; 

 sparsely clothed with small bronzy-brown hair-like scales which are denser in 

 three longitudinal stripes on the disk separated by two narrow bare stripes, a 

 marginal line of very broad silvery-white scales on anterior edge and along 

 lateral margins to the roots of wings; bristles long and coarse, dark brown; 

 pleurae dark brown, a narrow line of very broad silvery-white scales cross 

 middle to base of abdomen in continuation of white line on the head and across 

 prothoracic lobe, a few coarse blackish bristles ; coxse brownish luteous. Scu- 

 tellum with the mid lobe prominent, dark brown, each lobe with a few long 

 black bristles, the mid lobe with some minute dark scales. Postnotum elliptical, 

 prominent, dark brown, nude. 



Abdomen subcylindrical, dorsally flattened, truncate at tip; dorsal vestiture 

 of small, dense flat scales, metallic pale ochraceous, a very narrow line of black- 

 ish ones at base of each segment, widening into a series of triangular spots at 

 centers of segments ; sides broadly black scaled ; venter metallic dirty yellowisli- 

 white scaled ; ciliation coarse and rather abundant beneath towards apex. 



Wings rather narrow, hyaline; petiole of second marginal cell about three 

 times as long as its cell, that of second posterior cell nearly twice as long as its 

 cell ; basal cross- vein distant more than its own length from anterior cross- vein ; 

 scales on costa blackish brown, basal third of first vein clothed with clear white 

 scales; veins with very small brown scales, outstanding scales on second, third, 

 and forks of fourth veins large and broadly lanceolate. Halteres whitish, with 

 black knobs. 



Legs rather long and slender; vestiture dark brown with a bronzy reflection 

 and marked with white ; femora whitish beneath at base, tips of femora and tips 

 of hind tibiae narrowly silvery-white; hind tarsi with the last three joints 



