296 THE BLOWFLIES oF NortH AMERICA 
Biology, habits and immature stages. Egg: As described for 
vicina. 
Larva. Third instar: Color, size, and habitus as in vicina. 
Segments 2 to 8 (sometimes 9) anteriorly with complete spinose 
bands, segments 2 to 12 anteroventrally with spinose bands, these 
not continuing over dorsum on segments 9 to 12; segments 6 to 
11 with posteroventral spinose bands, segments 10 and 11 with 
posterior band complete over dorsum and the band on segment 
10 weak dorsally. All spines minute and simple. Anterior spira- 
cles each with 8 or 9 (more often 8) circular openings; posterior 
spiracles (pl. 42, E) each with three slit-like apertures, the 
‘‘button’’ and peritreme obvious, the latter complete. Cephalic 
segment with obvious branching oral grooves radiating from 
‘the oral aperture. Cephaloskeleton (pl. 42, F) with pharyngeal 
selerite with ventral ridges. Posterior cavity margined by six 
dorsal equidistant tubercles and eight nearly equidistant ventral 
tubercles; dorsally, the median pair of tubercles largest, these 
separated by a distance equal to two times the diameter of one 
spiracular plate; ventrally, outer two tubercles largest, the inner 
pairs smallest, the usual innermost pair hardly discernible, the 
median tubercle situated dorsally to a line between the inner 
and outer tubercles. 
The species is saprophagous with habits essentially similar to 
those described for vicina and vomitoria. 
It has been assumed in the past that coloradensis is larvi- 
parous, for females of this form are often found in collections 
with first star larvae protruding from their abdomens. This 
species deposits eggs in the normal calliphorid manner and the 
presence of larvae in female flies is probably due to withholding 
the incubating eggs for deposition in a desirable location. 
Wilson (1933) found puparia of coloradensis in the burial 
erypt of a dog, in the “‘hard-pan’’ of the so-called ‘‘White Dog 
Cave’’ in northeastern Arizona. He estimated these to be from 
6 to 10 thousand years of age. 
Calliphora livida, new species 
Calliphora viridescens (of North American authors, nee Robi- 
neau-Desvoidy), Hough, Zool. Bull. 2(6) :286, 1899; Felt, 
26th Ann. Rept. N. Y. St. Ent. 1910:66; Walton, Ent. Soe. 
Wash. Proce. 15(1) :22, 1913; Whiting, Ent. Soe. Amer. Ann. 
6 :265, 1913; Bishopp, Jour. Econ. Ent. 10:273, 1917 (mis- 
spelled iridescens); Malloch, Canadian Arctic Expedition 
Rpt., vol. 3, p. 58¢, 1919; Shannon, Insecutor Inscitiae Men- 
