148 THE BLOWFLIES OF NortTH AMERICA 
in less than 48 hours; they observed a maximum migration of 
15.1 miles. 
Economic importance. As already stated, macellaria is a 
‘‘secondary’’ mylasis-producing species of minor importance. 
Only twelve cases of myiasis caused by macellarra were reported 
in 1936 from the southern United States by Knipling and Rain- 
water (1937). Sarcophaga plinthopyga Wied. occurs more fre- 
quently in pure cultures in cases of myiasis in southwest Texas 
than macellaria, and Phormia regina is of more importance in 
the southeast. 
According to Knipling and Travis (1937, p. 783), the larvae 
apparently kill infested animals, but the species is not of par- 
ticular importance in areas where americana is not present ex- 
cept under certain conditions where soiled wool or other factors 
render sheep susceptible to severe maggot infestation. 
Callitroga macellaria is frequently involved in the blowing 
of meats in shops and homes and, when abundant, is of consider- 
able economic importance in abattoirs. It is the common fly 
about the market places in the American tropics. 
Callitroga minima (Shannon), new combination 
Cochhomyia minima Shannon, Wash. Ent. Soe. Proe. 28 (6): 
124, 1926; Cushing and Hall, Wash. Ent. Soc. Proce. 39 (7): 
196, 1937. (Type, male from San Francisco Mountains, 
Santo Domingo, West Indies, No. 28886, U. S. National Mu- 
seum). 
A small species with the same general appearance of macellaria, — 
but the fourth abdominal tergite cupreous. 
Male. Similar to macellaria but head height 9.0; width 11.1; 
length at antenna 4.6 and at vibrissa 4.8; eye height 6.8; bueca 
0.26 of eye height, with dark hair above which becomes yellowish 
below and toward the metacephalic suture; eye larger than nor- 
mal for the genus, the facets on inner and upper margins slight- 
ly larger than those laterally and below; frontale black, approxi- 
mately 0.5 frontal width at narrowest; front at vertex 0.16 of 
head width, 0.07 at narrowest (slightly anterior to anterior 
ocellus) and 0.25 at antennal base, blackish, with silvery pollen 
which is slightly tinged with yellow, and with pale hairs outside 
the frontal row, these continuing anteriorly on the parafaciale; 
frontal row of bristles, about 11 in number, becoming vestigial 
toward occiput, the rows diverging anteriorly as they follow the 
frontale, and extending to the base of the second antennal seg- 
ment; reclinate frontoorbital bristle one; vertex with dull black 
