27 
quite dark at banes; yellow blotch on dorsum of abdomen, occupying nearly its whole 
surface, leaving only a narrow band of black around the edge : venter the same 
Male. — Rather smaller than the 9, hut agrees otherwise, except that the scape of 
the antenna- lias h ventral leaf-like expansion; the abdomen is even more ronnded 
than in the 9, and the yellow blotch is much smaller. 
Described from 1 $ and 1 9 bred, July 11, 1882, from the larva of 
Platyhypena scabra (F.), District of Columbia. |"C. V. R. Coll.] 
46. (4) Euplectrus catocalae,n. sp. 
Length, 2.3 mm ; expanse of wings, 4.3 mm ; greatest width of fore wing, 0.7 niul - 
Differs from E. comstockiim its larger size, more rounded abdomen, and in the appear- 
ance of the abdominal blotch. This in the $ occupies the whole of the anterior half 
of the dorsum of the abdomen, while the venter is entirely yellow except at tip. 
With the 9 the spot occupies the anterior center of the dorsum of the abdomen, is 
oval in form, and is bounded on all sides by a broad margin of dark brown ; th e 
venter is as with the $ . The metascutellum is finely striated longitudinally. The 
yellow spot on the lower front extends to the base of the antennae. 
Described from 3 $ 's and 2?'s bred, July 5, 1873, from the larva of 
a species of Catocala at Saint Louis, Mo. [C. V. R. Coll.] This species 
has also been bred from a geometric! larva on birch, found at Hyatts- 
ville, Md., July 9, 1882. [Dept. Agr. Coll.] 
47. (5) Euplectrus frontalis, n. sp. 
Female. — Length, 2 mm ; wing expanse, 4.7 mm ; greatest width of fore wing, 0.81 imu . 
In this species the sculpture of the thorax is more definite than in any other so 
far considered. The pronotum is deeply but sparsely punctuate except at its posterior 
border; the mesoscutum is quite coarsely shagreened, and its median carina is faint : 
the metascutellum is plainly longitudinally striate. The yellow spot of the lower 
front includes the bases of the antennae, but the cheeks below this point are black to 
the bases of the mandibles. In other respects it resembles E. catoeahv. 
Described from 1 9 , bred, September 13, 1882, from an unknown 
noctuid larva on walnut, collected at Arlington, Va. [C. V. R. Coll.] 
Genus TClachistus Spinola. 
Antennae inserted considerably below the middle of the face, tlagellum very rarely 
incrassate; funicle 4-jointed; club 2-jointed. Thorax with a large conico-semiglobose 
pronotum: mesoscutum short; niesoscutelluni with two Longitudinal grooves, meet- 
ing at the apex; metanotal median carina acute. Fore wings with the postmarginal 
vein plainly Ion get than the stigmal; stigmal club small but with an acute uncus. 
Abdomen usually with a short smooth petiole. Posterior tibiae I -spurred. Body 
black, immaculate: head always more or less metallic. 
48. (1.) Elachistus proteoteratis. n. sp. 
Female.— Length, 1.8b""": wing expanse, 3.12 mm ; greatest width of fore wing 0.53 a,m . 
Head broadly oval, cheeks well rounded, antenna] fossa- converging dorsally : the su- 
tures of the mesoscutar parapsides and of the soapulssare continuous: the postmargi- 
nal vein is rather longer than the stigmal. which is very Straight, with a small club 
and a sharp claw. Face smooth : occiput and top of bead near eyes slightly punetu- 
late; pronotum sparsely punctured, exoepl at its smooth posterior border; meeosou- 
tum transversely Bhagreened; mesoscutelUim very finely coriaceous: rneta and post- 
