1929] 
Diptera of Labrador 
139 
Volucella Geoffroy 
V. bombylans arctica Johnson. 
V. facialis form arctica Johnson Psyche, vol. 23, p. 163, 
1916. 
V. bombylans arctica Johnson. Psyche, vol. 32, p. 116, 
1925. 
Rama, 1899 (Stecker and Sornborger), Nain (Sorn- 
borger), Nain, Aug. 18, 1908 (Bryant). 
This circumpolar group of Volucella that live in the nests 
of various species of Bombus, form an interesting but 
difficult group to classify. Recognizing but one species with 
numerous subspecies seems to be the most satisfactory 
method of treating them. 
Eristalis Latreille 
E. arbustorum Linn. Nain, Aug. 18 (Bryant) Battle Harbor 
(Englehardt). 
E. bastardii Macq. “Labrador” (Williston). 
Helophilus Meigen 
H. borealis Staeger. Rama (Stecker and Sornborger), Nain, 
Aug. 18 (Bryant). 
H. groenlandicus O. Fab. Indian Harbor (Packard), Nain, 
Aug. 18 (Bryant). 
H. latifrons Loew. Nain, Aug. 18 (Bryant). 
Oestrid^e 
Cephenomyia trompe Linn? 
The species that infests the Barren-ground Caribou 
(Rangifer articus) is probably the same that frequents the 
reindeer and is circumboreal in distribution. The adult fly 
has not been taken. Dr. Grenfell informs me that in all the 
heads of the caribou that he has examined he found para- 
sitic larvae usually just below the ethmoid. See Insects of 
Labrador, in appendix to “Labrador the Country and the 
People” by Wilfred T. Grenfell, 1909. 
