1863.] 
165 
were found in the nest. Among the specimens of Apathus elatus, the variation 
was considerable ; all had the black band between the wings, but some had 
the anus entirely black, some black tipped with fulvous or yellow, some en¬ 
tirely yellow and others entirely fulvous. This last variation is doubtless the 
J5. nidulans of Fabr., and seems to confirm my supposition (Proc. Ent. Soc. 
Phil, ii, pp. 107 and 115), that it is an Apathus and a variety of A. elatus. 
‘^On the 7th of October, 1863, a nest of Bomhus Virginicus Oliv., was captured 
near Kaighn’s Point, I7ew Jersey. It contained 30 females, 38 workers and 34 
males. No Apathus were found in the nest. All the females, excepting one 
specimen, were of the largest size ; the workers were all small, varying from 5 
to 8 lines long; the males were mostly 7 to 8 lines long, although one specimen 
measured only 4^ lines. I could not perceive any tendency to vary in the 
coloration of the different sexes. 
In my paper on the N. American Bombi (Proc. Ent. Soc. Phila. ii, p. 90), I 
described a male specimen, named by Dr. Harris Bomhus impatiens, as distinct 
from those which I took to be the males of B. Virginicus, expressing, however, 
a fear that I might have these two kinds of males mixed up. The capture of 
the nest of B. Virginicus, above noticed, seems to confirm my fears, as all the 
males found in the nest were precisely like those described by me as B. impa¬ 
tiens Harris. Those males which I described (ibid. p. 87) as belonging to B. 
Virginicus. are so different from those males found in the nest of that species, 
they cannot possibly belong to the same species. I am, therefore, disposed to 
separate from B. Virginicus, those specimens which I previously thought might 
be a variety of that species, and which differ by having the anterior portion of 
the second segment of the abdomen above, more or less clothed, especially in 
the middle, with rather short hairs, similar to those on the first segment, but 
generally shaded with brown. It may be named 
Bomhus separatus, n. sp. 
‘^Female. Head entirely black. Thorax above and on the sides yellow, some¬ 
times tawny-yellow, with a round patch of black on the disk between the 
wings. Scutellum yellow, sometimes tawny-yellow. Wings fusco-hyaline, api¬ 
cal margins fuscous, nervures black. Legs black, tarsi brov/nish, basal joint 
rufous within. Abdomen with the first segment above yellow, sometimes 
tawny-yellow, the hairs more dense and longer on the sides; anterior part of 
second segment in the middle more or less yellow or tawny-yellow, remainder 
of the abdomen black. Length 10—11 lines. 
^^Woi'ker. Same as the female, except that almost the whole of the first and 
second segments of the abdomen above is brown, and the smaller size. Length 
6 lines. 
'•‘Male. Described under B. Virginicus (ibid. p. 87.) 
“Hah. Rock Island, Ill. (Walsh), Penn., Canada (Saunders), 4 J , 2 9 > 6 ^ . 
Collection of the Entomological Society of Philadelphia. 
“ Differs from B. Virginicus as follows :—Body shorter and more compact ; 
the hairs of the thorax are more dense and with the exception of the round 
spot of black hairs on the disk, there is no mixture of black between the wings 
which are broader, longer, and much darker than in Virginicus, the wings of 
