1864] 
379 
side of the middle of the anterior margin, the anterior half of the tu¬ 
bercles, the posterior margin of the scutellum, slightly interrupted in 
the middle, and a small spot on the extreme sides of the scutellum at 
base, yellow; sides of the metathorax clothed with long pale hairs; 
tegulae ferruginous. Wings fuliginous, the marginal cell almost black; 
nervures black. Legs black; tips of femora yellowish-ferruginous; 
tibiae and tarsi yellowish, with an oblong black spot on their exterior 
surface; tarsi clothed beneath with golden-yellow hairs. Abdomen 
very convex, shining, black, rather densely, deeply and uniformly punc¬ 
tured, the apical margin of the segments smooth, impunctured; first 
segment with a short transverse median basal yellow line, and at the 
extreme sides a basal subquadrate yellow spot, very slightly emarginate 
within; an oblong yellow spot or stripe obtusely pointed within and 
rather deeply indented posteriorly, on each side of the second, third 
and fourth segments; a large yellow spot, slightly emarginate exteri¬ 
orly, on each side of the fifth segment; the extreme lateral edge of the 
yellow spots on each side of the second, third and fourth segments are 
slightly emarginate; apical segment black; ventral scopa golden-yel¬ 
low. Length 4 lines. 
Male .—Kesembles the female, but differs as follows :—size rather 
larger; the clypeus, mandibles and sometimes a small spot immediately 
above the clypeus, yellow or yellowish-ferruginous; the posterior mar¬ 
gin of the scutellum sometimes very narrow, with the lateral basal spot 
wanting; posterior coxae each with a stout yellow spine; the middle 
spot at the base of the first segment of the abdomen is smaller and 
quadrate; the oblong spot on each side of the fifth segment resembles 
those on the three preceding segments, the sixth segment entirely 
black; the apical segment yellow, black at base, dilated and rounded 
on each side, with the apex produced in the middle into an obtuse 
tooth ; ventral segments stained with rufous. 
Hah. —Mass., Conn. Coll. Ent. Soc. Phila., and Mr. E. Norton. 
The 9 of this species differs from the description of the 9 of A. 
curvatum Smith, as follows:—There is no “ minute yellow spot before 
the anterior stemma”; the collar is black, not “yellow”; there is a 
yellow spot on each side of the thorax anteriorly; the legs are black, 
vittate with yellow, and not “yellow varied with ferruginous”; the 
basal segment of the abdomen has three spots, and the fifth segment 
