1864.] 
381 
their summit; thorax with a widely interrupted line before, extending 
round above the wings, and two oblique lines upon the scutel, yellow; 
wings fuliginous; feet blackish, with dull rufous joints, and tarsal 
hair ; anterior feet before dull rufous; tergum, bands yellow, not at all 
emarginated each side, the basal band widely interrupted, second band 
less widely interrupted, the penultimate one hardly interrupted, the 
ultimate one entire. Length about seven-twentietbs of an inch. 
“ Hah. —Missouri.” 
10. A. dorsale, St. Farg. 
Anthidium dorsale, St. Farg. Hym. ii, p. 384, ^ (1841.) 
“ Male. —Head black; its hairs rufous: clypeus, cheeks, face, upper 
part of the mandibles, of a ferruginous-yellow, as well as a spot behind 
the eyes. Antennas black with the first joint in front yellow. Thorax 
black; its hairs whitish, except those of the back which are rufous; a 
ferruginous line upon each shoulder, prolonged at its two ends; the 
upper emitting at a right angle a line of the same color, which descends 
as far as the middle of the back, and the lateral giving rise to another 
ferruginous line which margins the back along the base of the wings 
as far as the scutelluni. Scale of the wings black, its anterior part 
ferruginous-yellow. Scutellum ferruginous, except the base of the 
middle lobe, which is black. Abdomen black, its first segment ferru¬ 
ginous with the base black : the second, third, fourth and fifth having 
a ferruginous-yellow band, which is dilated upon the sides: the sixth 
and the anus ferruginous, prolonged in the middle. Legs ferruginous. 
Wings tolerably transparent, but a little smoky towards the tips. 
Length 5 lines. 
“ Hah. —Georgia.” 
Gen. CHELOSTOMA, Latr. 
“ Head quadrate, usually wider than the thorax ; the antennoe not longer than 
the head in the female, the flagellum elavate; half as long as the thorax, slen¬ 
der and filiform in the male. The lahrum elongate, narrowed anteriorly, and 
truncate at the apex ; the mandibles bidentate at their apex and densely cili¬ 
ated with hairs on their inner margin ; the ocelli placed in a triangle, the pos¬ 
terior pair in a line with the vertex of the eyes. The labial palpi four-jointed, 
the basal joint about one-third the length of the second, the second joint some¬ 
what attenuated at the apex, the third placed in a line with it, short, the fourth 
joint clavate-truncate, attached to its side near the apex. The maxillary palpi 
three-jointed. The anterior wings have one marginal and two submarginal 
cells j the second submarginal receiving the two recurrent nervures. Abdomen 
