186 Tae BLOwF.ulEs oF NortH AMERICA 
yellow green with bronze luster and covered with whitish pru- 
inosity. Otherwise similar to female of metallica. 
Distribution. Nearctic: Widespread from central California 
to British Columbia and eastward to New England but evidently 
not abundant anywhere. 
In addition to the original type series, there are four specimens 
of aenea in the National Museum collection reared from nests of 
the swallow Petrochelidon albifrons albifrons, during August 
and September 19387, Kamloops, British Columbia (G. J. Spen- 
cer), and four specimens reared from a sparrow fledgling, July 
2,1936, Hamilton, Mont. (C. B. Philip). 
A paulina avium (Shannon and Dobroscky), new combination 
Protocaliphora avium Shannon and Dobrosecky, Wash. Acad. 
Sei. Jour. 14:250, 1924; West, 7» Leonard, Mem. 101, Cornell 
Univ., p. 827, 1928; Jellison and Philip, Canad. Ent. 65(1): 
26-31, 1933. (Type, male from Ithaca, N. Y., No. 26856, 
U.S. National Museum. ) 
Protocalliphora avium var. asiovora Shannon and Dobroscky, 
Wash. Acad. Sei. Jour. 14:250, 1924. (Type, male from 
McElroy Lake, Wash., No. 26858, U. S. National Museum.) 
New synonymy. 
Parafrontale wide in both sexes; the outer forceps of the male 
half as wide as long. 
Male. Head length at vibrissa 8.0 and at antenna 9.0; eye 
height 9.25; head height 12.5; head width 15.0; bucca 0.27 of 
eye height and with abundant rather short and stubby black 
hair; frontale black, 0.60 frontal width; front at narrowest 0.15 
head width, 0.23 at vertex and 0.40 at lunule, black, with light 
yellow to golden pollen, and with several rows of small setae 
outside frontal row of bristles which descend to below the 
middle of the second antennal segment, none near eye margin; 
frontal bristles about 12, these shorter and more hairlike toward 
vertex, the rows slightly divergent and extending anteriorly 
almost to the base of the second antennal segment; parafaciale 
about 0.46 clypeal width and widening above, opposite lunule 
wider than distance between vibrissae in proportion of 3.6:3.2, 
black, with thin silvery yellowish pollen and with scattered 
setae above; faciale bristled one-half the distance to antennal 
base with two rows of short stout setae; palpus 3.5 in length, 
yellowish orange; second antennal segment orange red; third 
antennal segment 1.6 times as long as second, dark orange 
