288 THE BLOWFLIES oF NortH AMERICA 
(which is narrowest) 0.36 head width. Wing with costal sec- 
tions 2 to 6 in the proportions 80:40 :90 :52 :8. 
Length. 7-8 mm. 
Type. Male, No. 54933, U. S. National Museum. 
Type locality. San Luis Potosi, Mexico. 
Three male and 6 female specimens of this saprophagous spe- 
cles were reared from decaying beef Mar. 23, 1931, by R. A. 
Roberts (Bishopp No. 17216). 
ALDRICHINA TOWNSEND 
Aldrichina Townsend, Rev. de Ent. 4:111, 1934; Manual of 
Myiology, vol. 2, p. 170, 1935; ibid., 5:135, 1937. Genotype. 
Calliphora grahanuw Aldrich. Monobasie. 
Aldrichiella Rohdendorf, nee Hendel, Zool. Anz. 95(5-8) :177, 
1931; Villeneuve, Arkiv for Zool., 27A (34) :9, 1936. Geno- 
type, Calliphora grahami Aldrich. Isogenotypie with 
Aldrichina. 
Male and female. Head width considerably greater than head | 
height; length at antenna and at vibrissa about equal in male 
but vibrissal length greater than antennal length in female; 
epistoma elongate, nearly as wide as clypeus and warped for- 
ward from eclypeal plane at an angle of nearly 30 degrees; meta- 
cephalon hardly apparent in profile view; eye large, ovate, set at 
a low but obvious angle from rear of head; parafrontale wide in 
both sexes but wider in female; frontale striate; rows of frontal 
bristles moderately divergent anteriorly; inner vertical bristles 
reclinate in male, decussate in female; outer vertical bristles two- 
thirds as long as inner vertical bristles in female; frontoorbital 
bristles absent in male, two proclinate and one reclinate in 
female; ocellar triangle large in both sexes, reaching nearly half 
way to lunule in female; eclypeus about twice as long as wide; 
facial carina absent; parafaciale but slightly narrowed below, the 
upper half or more setose; faciale slightly concave in profile, and 
with two or three rows of short black setae extending about four- 
fifths the distance from the vibrissa to the antennal base; vi- 
brissa above the oral margin; haustellum nearly one-third as 
long as head height; palpus long clavate; antenna at eye middle 
when head is viewed in profile, bases approximated; arista with 
long plumosity above and below for about two-thirds its length; 
back of head rather flat in male but more or less rounded in 
female. ) 
Thorax with four humeral bristles, three of which are in 
