514 PROCEEDINGS OF THE NATIONAL MUSEUM VoL, 118 
ation of the Kuropean specimens is much blacker than most of the 
North American specimens I have seen. I suspect that O. hiemalis 
(Loew) may not actually occur in North America and that published 
records of this species were based on specimens which were actually 
O. petersoni (Malloch). 
DistRIBUTION.—Colorado (based on a single female specimen in 
which the palpi are entirely black), Maine (Johannsen, 1941); “late 
fall to early spring”? (Johannsen, 1941). 
Orbellia barbata (Garrett) 
Fiaure 15 
Barbastoma barbatus Garrett, 1921, p. 123; 1924, p. 33. 
Barbastoma barbatum (Garrett), Czerny, 1924, p. 68. 
This species bears a general resemblance to Orbellia petersoni (Mal- 
loch). The fore basitarsus is no longer than the second tarsal segment. 
The yellow “beard” of O. barbata (Garrett) may be used to separate 
males, but the structure of the male terminalia is perhaps more re- 
liable. In O. barbata (Garrett) the surstylus is somewhat rectangular 
and broadly rounded or blunt apically, whereas in O. petersoni 
(Malloch) and in O. hiemalis (Loew) the surstylus is long and tapering. 
Maue.—Front dark orange with setae in anterior half; fronto- 
orbital bristles about equal; upper back of head, posterior portion of 
frontal plates, and ocellar triangle grayish, pollinose; lower back of 
head becoming pale yellow; face and cheeks pale yellow; setae of back 
of head black in upper half, becoming long fine yellow hairs below; 
oral vibrissae weak; black buccal setae anteriorly, becoming long 
yellow hairs behind; palpi yellow; third antennal segment dark brown 
or blackish, arista microscopically pubescent. 
Thorax yellowish brown with gray pollinosity, mesonotum (except 
humeri) darker than pleura; usual 3 pairs of supra-alar bristles present 
(not 2, as in Garrett’s description of the genus Barbastoma); pleura 
bare except for propleural and sternopleural bristle (sometimes an 
additional hair or two near the bristle), and the usual hairs on the 
sternopleuron between the coxae. 
Legs yellow, except for blackish distal tarsal segments; anterior 
femora conspicuously swollen; fore basitarsus equal to or slightly 
shorter than the second tarsal segment; fore basitarsus with a con- 
spicuous curved claw distally on anterodorsal surface; middle tibia 
with 2 dorsal preapical bristles and several ventral apical bristles; 
dorsal preapical bristles of fore and hind tibia very weak. 
Wings with veins brownish, membrane hyaline with faint brownish 
tinge; costal spines sparse; first longitudinal vein long, ending 
about halfway between the level of the 2 crossveins; second vein 
