28 
scutelli smooth ; metathoracic carina delicate; petiole rather short, cylindrical, and 
rugose; abdomen elliptical, concave above, convex below. Pronotum and mesoscu- 
tum with many white hairs; a longitudinal row of long delicate white hairs on the 
metapleura of each side. Color, dark metallic- green ; scape of antenna? nearly 
white, flagellum, light ochre- yellow ; mouth parts nearly white, mandibles shining 
brown at tips ; all legs yellowish-white, except hind cox*, which are brownish rear 
base; basal half of abdomen above with a bright straw-colored blotch, bounded by 
brown and ending posteriorly in a straight transverse line; venter of abdomen with 
a longitudinal honey-yellow stripe, wider anteriorly than posteriorly. 
Described from 3 $ 's bred, in June, 1873, from larva? of Froteoteras 
cesculana Riley, at Kirkwood, Mo. fC. V. R. Coll.] 
49. (*2) Elachistus cacoeciae, n. sp. 
Male. — Length, 1.93 mm ; wing expanse, 3.84 min ; greatest width of fore wing, 0.74 ,ljr11 . 
Face subtri angular, cheeks nearly straight; mesoscutar and scutellar furrows not 
continuous, interrupted by the angle of the scapulae ; postmarginal vein much longer 
than stigmal. Head and eyes quite thickly covered with short, tine, dusky hairs, 
pronotum and mesoscutum furnished with longer and stouter dark hairs. Head sparsely 
punctured with transverse oblique lines on vertex andclypeus; occiput very finely 
and thickly punctured; scutellum smooth, and mesoscutum only slightly shagreened. 
Color shining black, not metallic ; scape of antenna: whitish below, dark brown 
above, flagellum dark brown, with short, dense, whitish hairs; mandibles light 
reddish-brown ; all legs yellowish-white, hind coxa; slightly darker at base ; first two 
joints of abdomen above with a yellowish-brown spot extending nearly to lateral 
edges, venter light brown at base. 
Described from 6 J's bred, August, 1877, from the leaf curl of Ga- 
coecia rosaceana (Harr.), at Kirkwood, Mo. [C. V. B. Coll.] One $ 
specimen of apparently the same species was bred at Washington, from 
Hyphantria textor, upon which it fed externally. The adult made its 
appearance October 29, 1881. [Dept. Agr. Coll.] 
50. (3) Elachistus coxalis, n. sp. 
Female. — Length, 2.*21' mn ; wing expanse, 4.34 mm ; greatest width of fore wing, 0.7 mm . 
Kesembles E. proteoteraiis very closely, but differs in size, as just iudicated, and also 
presents the following colorational differences: The posterior coxae have upon their 
outer basal portion a large definite metallic-green spot, which in proieoteratis is only 
faintly indicated; the middle coxa? are also faintly green at base; superior surface 
of antennal pedicel tinged with dark brown, superior portion of all the flagellar 
joints darker than inferior surface ; metapleural hairs long and conspicuous ; ventral 
yellow stripe very narrow near tip of abdomen. 
Described from 1 $ caught on window at Washington, D. C, Janu- 
ary 14, 1881. [C. V. R. Coll.] 
Subfamily ELASMLOE. 
Head subglobose: front sparingly but strongly punctate. Funicle 
of antennae 3-jointed. Thorax: Pronotum short, parapsides not distin- 
guishable, mesoscutellum depressed, metascutellum membraneous white. 
Wings narrow, marginal vein long, stigmal very short, almost punctiform, 
postmarginal distinct. Abdomen sessile, with a compressed venter. 
Legs becoming gradually longer and stronger; posterior coxae very 
large, tibise 2-spurred at tip. Antenna? of the male with three branches- 
