SuBFAMILY CHRYSOMYINAB ; 199 
Female specimens of cuprina which have the squamae only 
slightly tinged with yellow will run to metallica in the key, but 
females of metallica have the anteroventral surface of the mid- 
dle femur with one or two (usually only one) bristles toward the 
base. 
Distribution. Nearctic: Most abundant in northeastern United 
States but occurring rarely as far south as Virginia and even 
more rarely as far west as California; not common. 
As noted by Townsend in 1919, Coquillett identified this form 
as Calliphora splendida Macquart. He was followed in this by 
Aldrich and Shannon, who used the combination Protocalliphora 
splendida (Macquart). Macquart’s species, said to be from Gal- 
veston, Tex., was described as being 5 lines (10 mm.) long, with 
the thorax and scutellum black, the abdomen greenish blue with 
tip golden, the basal antennal segments short and fuscous, and 
the wing fuscous on the costal border. An unsuccessful attempt 
was made to locate the type of Calliphora splendida Macquart. 
So far as can be ascertained, species of Apaulina do not occur in 
Texas and specimens rarely approach 10 mm. in length. Mas- 
quart’s description of splendida does not accurately cover the 
species known under the name of splendida in North America 
and because of this the name metallica Townsend is used for this 
form. It would not be surprising to find the Maecquart type an 
entirely different species for, aside from the golden fourth ab- 
dominal segment, the description will fit many of the larger 
species discussed in this paper. 
Biology, habits, and immature stages. Larva. Third instar: 
Length 8-12 mm., greatest diameter 2.5-4.0 mm. Translucent 
pearly white; freshly fed larvae with reddish tinge, migrating 
larvae brownish. Cephalic segment nearly bare; second segment 
(pl. 38, D) with a fringe of elongate and narrowed setae on 
posterior margin; each successive segment with numerous spinose 
bands of minute single-pointed setae, these least numerous at 
segmental lines. Posterior spiracles above median line (pl. 38,C) 
in the weak posterior depression, small, separated by a dis- 
tance equal to two or three times the greatest diameter of one 
spiracle; anterior spiracle with eight or nine radially-arranged 
apertures. Cephaloskeleton (pl. 38, E) with small labial sclerites 
which are not strongly curved ventrally; hypostomal sclerite 
stronely sclerotized; parastomal sclerite rather short and thick; 
pharyngeal sclerite strongly sclerotized; no longitudinal ridges 
or grooves on ventral cornua. 
The third-instar larva of metallica differs from that described 
for avium chiefly in that body spines are smaller, the rows of 
