280 THE BLOWFLIES OF NortH AMERICA 
beneath apparent fourth tergite, mesolobe of same length but 
narrower than paralobes, both clothed with rather short fine 
dark hairs. Legs with usual chaetotaxy, including a strong ven- 
tral bristle just beyond middle of middle tibiae. Squamae whit- 
ish, upper side of thoracal with a few hairs on basal half only. 
Halteres darkened about base of knob. Length 7.5 mm. (females 
9-10 mm.). One male, five females. On herbaceous valley slope, 
6,1¢,22 2:on plateau dip wet from recent snow, 28 viii, 1 9 ; 
near tent, 29 viii, 192; in tent, 9 ix, 19, 1981.’’ 
This species evidently differs from popoffana by the long, out- 
standing bristles across the hind margin of the second tergite, 
and by the possession of discal as well as marginal bristles on the 
third tergite, the latter being not so strong as those on the 
fourth, however. The lobes of the fifth sternite of the male (pl. 
26, A) are not so prominent, the second sternite is about as 
long as broad in male, distinctly longer than broad in female 
and the hypopygium is smaller. 
This species has not been seen during the course of the present 
study, and the characters used in the key were abstracted from 
the above original description. 
Acronesia montana (Shannon), new combination 
Steringomyia montana Shannon, Wash. Ent. Soe. Proce. 28(6) : 
135, 1926; Curran, Ontario Ent. Soc. Ann. Rpt. 56:58, 1925. 
(Type, male, apparently lost.) 
Male. Supposedly differs from alaskensis (Shannon) in that 
‘‘forceps of male are distinctly more slender, similar to ys 
of aldrichia (Shannon).’’ 
The types of this species cannot be found in the National 
Museum although it was stated in the original description that 
they were deposited there. No specimens have been seen during 
the course of these investigations which would appear to belong 
to this species. No formal description is possible, and no at- 
tempt has been made to differentiate between this and other 
species of Acronesia in the key. 
Acronesia popoffana (Townsend), new combination 
Calliphora popoffana Townsend, Smithsn. Mise. Collect. 51:117, 
1908. (Type, female from Popoff Island, Alaska, No. 10885, 
U. 8. National Museum.) 
Cynomyopsis popoffana (Townsend) Townsend, Insecutor In- 
scitiae Menstruus 3:118, 1915. 
