104 
[July 
beneath; corbicula fuscous ; tarsi brownish, inner side of the basal joint 
bright rufous. Abdomen above with the basal segment and the poste¬ 
rior margin of the fourth segment yellowish; the second and third seg¬ 
ments reddish; remaining segments black. Beneath black, mixed 
with yellowish hairs. Length 8 lines. 
Worker. Colored same as the female, except that the yellowish 
fringe on the fourth abdominal segment is not so conspicuous. Length 
62 ^—7 lines. 
Male. Colored same as the female, except that the hairs of the head 
and the anterior part of the thorax are more yellowish, with a very 
slight mixture of black, and the black band between the wings much 
more distinct. Length 62 lines. 
Six ( 89 , 2 ^ , IS) specimens examined: Lake Athabasca, and 
(xreat Slave Lake. Mr. B. Kennicott. (Coll. E. Norton and Smith. Inst.) 
This is closely allied to jB. ternarius and ornatiis^ but differs from 
both species. 
83. B. ornatus. 
Bomhus ornatus Smith, Brit. Mus. Cat. Hym. ii, p. 398. 52. 
‘■’•Female.. Length 7 lines.—Black; the pubescence on the head 
black, mixed with yellow hairs at the insertion of the antennae; the 
thorax has a rich fulvo-ochraceous pubescence, and has a broad black 
band between the wings, the sides of the thorax anteriorly yellow; the 
legs have a black pubescence, with a few pale hairs at the base of the 
femora beneath; wings fusco-hyaline. Abdomen, the pubescence on 
the basal segment yellow, on the three following segments it is fulvous, 
having a narrow border of yellow, which divides it from the black pu¬ 
bescence which clothes the apex. 
“ The coloring of the male and the worker is the same, but less 
bright, and the pubescence is longer in the male than in the other 
sexes. 
‘•‘Hah. North America; Hudson’s Bay; Arctic America.” 
Unknown to me. Very closely allied to B. ternarius. 
34. B. ternarius. 
Bomhus ternarius Say, Bost. Jour. ITat. Hist. 1, p. 414. 
Bomhus Hunth Greene, Ann. Lyc. Hat. Hist. H. Y. 7, p. 172. 
Female. Head black, more or less yellow on the face and vertex. 
Thorax with its anterior portion, sides, and the scutellum lemon-yellow; 
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