CHARLES P. ALEXANDER 15 
4. Dark brownish black; legs dark brown; wings uniformly suffused with 
dark, the veins ahuost black. (Guatemala) argenteo pleura Alexander '^'^ 
Light brown with a gray bloom; legs medium brown; wings subhyaline, 
the veins pale brown. (Colombia) andina sp. n. 
Genus ATARBA Osten Sacken 
Atarba brunneicornis sp. n. 
Antennae l^rown; femora vmiform in color throughout; wings very light yel- 
low. 
Male. — Length, 4.8 mm.; wing, 5.3 mm. 
Rostrum rather long, dark brown; palpi dark brownish black. Antennae 
very long and slender, longer than the head and thorax together; the flagellar 
segments elongated, covered with a thick white pubescence and with one long 
hair on the outer face; antennae with the basal segments reddish brown, the 
flagellum dark brownish black. Head with a delicate impressed line extending 
from the occiput cephalad to a slight frontal tubercle which is provided in 
front with two small hairs; head brown, thinly whitish polhnose. 
Thoracic dorsuin dull yellow without apparent darker stripes. Pleura 
whitish yellow. Halteres pale, the knob brownish. Legs with the coxae and 
trochanters dull yellow; femora yellow; tibiae and tarsi brownish yellow. 
Wings very light j^ellow, iridescent, a faint brown ill-defined suffusion in the 
region of the stigma; veins pale brown. Venation: (see plate I, fig. 6) Sc end- 
ing opposite the origin of Rs; Rs straight or nearly so, oblique; cell 1st Mi 
twice as long as broad; basal deflection of Cui under the middle of cell 1st Mi. 
Abdominal tergites dark brown, the apex of the segments rather paler; 
liypopygium brownish yellow; sternites dull yellow. Hypopygium (see plate 
IV, fig. 2) with the pleurites rather long and slender, liearing two chitinized 
appendages, the ventral apical appendage rather flattened, the caudal or outer 
edge with about five sharp teeth, the tip produced into a point; the dorsal 
apical appendage is slender, subcylindrical, curved slightly dorsad, and 
shghtly longer than the ventral appendage; guard of the penis a little shorter 
than the pleurites, cylindrical. 
Habitat. — Colombia. Holotype, cf, La Cumbre, Colombia, 
altitude 6600 feet, May 18, 1914 (Parish coll.). 
A. brunneicornis is allied to A. columbiana Alexander ^^ also from 
Colombia but the two forms may be separated by means of the 
following key : 
Femora with a brown ring just before the tip; Rs longer, arcuated; cell 1st 
Mi short and almost square; basal deflection o' C«i just beyond the fork 
of M. Columbiana Alexander^^ 
2° 1913. argenteo pleura Alexander, Psyche, xx, p. 48, pi. 2, fig. f. 
2iJourn. N. Y. Ent. Soc, xxi, p. 199, 1913. 
22 1913. Columbiana Alexander, Journ. N. Y. Ent. Soc, xxi, p. 199, pi. 5, 
fig. 4. 
TRANS. AM. ENT. SOC, XLII. 
