Wasps and Bees 31 g 
Botnhus pleuralis (Nyl.) Franklin. 
Botnbus pleuralis Franklin, Trans. Amer. Ent. Soc. XXXVIII, p. 364. 
Male. — Head and thorax clothed with yellow pile; a few black hairs on 
the inner and outer margins of the eyes and around the ocelli and a well-defined 
black interaler band. Abdomen with segments 1 and 2 yellow; segments 3 and 
4 bright red, with a few black hairs at the bases of the segments in one specimen; . 
segments 5 to 7 black, a few red hairs on segment 5; venter mostly pale yellow. 
Length, 13-14 mm. 
Worker. — Head black with a small patch of yellow between the antennae 
and extending above them, and another on the vertex. Thorax yellow with a 
well-defined black interalar band. Abdomen: segments 1 and 2 yellow with, 
in three specimens, a few dark hairs in the middle, segments 3 and 4 red, 5 and 6 
variable. Length, 10-12 mm. 
Two males from Nome, Alaska, August 24-25, 1916 (F. Johansen); four 
workers, Nome, Alaska, August 24-25, 1916 (F. Johansen). 
This is Franklin's "colour variant" of pleuralis. In the red band on the 
abdomen it approaches flavifrons Cr. and centralis Cr. but is distinguished 
therefrom by the clear ])lack interalar band and the weak yellow on the face. 
However, extensive collecting of the three forms in Western Canada by the 
writer shows that flavifrons and centralis are merely varieties of pleuralis. The 
name pleuralis is applied by Vogt to one of the forms of the Kirhyellus group. 
Bombus frigidus, Smith. 
Bombus frigidus, Franklin, Trans. Amer. Ent. Soc. XXXVIII, p. 360. 
Male. — Head and thorax pale yellow, a few black hairs around the margins 
of the eyes, the insertion of the antennae and the ocelli, and a well-defined black 
interalar band. Abdomen: segments 1 and 2 pale yellow, segments 3, 4 and 
base of 5 black. Apex of 5 and remaining segments dingy white with a fer- 
ruginous tinge, evidently faded. Length, 123^ mm. 
Worker. — Face black, vertex pale yellow. Thorax pale yellow with a 
broad black interalar band. Abdomen: segments 1 and 2 pale yellow, segment 
3, and base of 4, black; apex of segment 4 and remaining segments pale fer- 
ruginous. Length, 10-11 mm. 
One male, Nome, Alaska, August 24, 25, 1916 (F. Johansen); two workers, 
Nome, Alaska, August 24, 25, 1916 (F. Johansen). (The Canadian National 
Collection contains a worker of Bombus mixtus Cr. taken in the Porcupine 
Mountain district, Yukon Territory, on June 15, 1912, by D. D. Cairnes.) 
Terrestris Group. 
Terrestris Group, Franklin, Trans. Amer. Ent. Soc. XXXVIII, p. 261. 
.Distinguishable from the other groups by its broad face, very short malar 
space, less than one-fifth as long as the eye, and the very different genitalia of 
the males. 
Bombus lucorum, L., variety moderatus Cr. 
Bombus terrestris, var moderatus Franklin, Trans. Amer. Ent. Soc. XXXVIII, p. 262. 
Worker. — Head black; thorax black, with an anterior pale yellow band. 
Abdomen: segment 1 black, pale yellow at the sides; segment 2 pale yellow, 
segment 3 and base of segment 4 black; apex of segment 4 and segments 5 and 6 
white. Length, 12 mm. 
