344. THE BLOWFLIES oF NortTH AMERICA 
postacrostichal and post supraalar bristles three each row; scu- 
tellum large, flattened on dise, with one discal bristle, four to 
six lateral bristles, the foremost intermediate lateral placed 
further down on side of scutellum than the others in the series, 
and laterally with fine tawny hair which extends to lateral 
dorsal margins. 
Legs with fore femur with scattered bristles on the posterior 
surface; middle femur with about five anterior bristles in a series 
toward middle, two anteroventral bristles toward middle, and a 
ventral row of bristles basally; middle tibia with two antero- 
dorsal bristles near middle, one ventral bristle near apical third, 
four posterodorsal bristles, one near basal fourth, two near 
middle and one near apical sixth; hind tibia with three antero- 
dorsal bristles, two toward middle and one near apical fourth, 
three anteroventral bristles between middle and apical third, one 
long dorsal, subapical bristle, and a row of five or six postero- 
dorsal bristles which are shortest basally; claws and pulvilli 
small. 
Wing without costal spine; subcostal sclerite with a few long 
fine hairs; bend of fourth vein rather rounded, without fold or 
apical section; apical cell usually clearly open; anterior cross 
vein oblique; posterior cross vein doubly arcuate. 
Abdomen with scutellar depression extending from 0.20 to 
0.25 the distance to the hind margin of the first segment; third 
segment with a marginal row of short weak bristles; first ster- 
nite of male as long as broad, third and fourth sternites smaller, 
edges overlapped by margins of tergites; margins of tergites 
and the sternite with long yellowish pile. 
Male genital segments of medium size; first segment with a 
marginal row of bristles. 
Pollenia rudis (Fabricius) 
(The cluster fly) 
Musca rudis Fabricius, Entomologia Systematica, vol. 4, p. 314, 
1794; Systema Antliatorum, p. 287, 1805; Fallen, Mono- 
eraphia Muscidum Sueciae, p. 48, 1821; Meigen, Systema- 
tische Beschreibung der bekannten europdischen zweifliige- 
ligen Insekten, vol. 5, p. 66, 1825. (Type, ‘‘Germania Dom. 
Smidt,’’ evidently lost.) 
Pollema rudis (Fabricius) Robineau-Desvoidy, Essai sur les 
Myodaires, Paris, p. 412, 1830; Hoffmeister, Die bis jetzt 
bekannten Arten aus den Regenwiirmer, Braunschweig, 
