INSECUTOR INSClTly-E MENSTRUUS 159 



Acanthodotheca, new genus. 



Differs from Sarcophaga as follows (omitting subfamily and 

 tribe characters above given) : Facialia considerably flattened, 

 but showing convexity. Vibrissse well constricting facial plate. 

 Proboscis not as long as head height. Arista plumose a little 

 over halfway. Male vertex hardly one-half eye, female vertex 

 hardly three-fifths eye. Frontal bristles diverging obliquely 

 two below base antennae. Female without proclinate fronto- 

 orbitals. Male frontalia narrowed. Ocellars present in both 

 sexes. Parafacialia half as wide as clypeus, with row of hairs 

 which are mostly bristly. Cheeks a little over one-third eye- 

 length in both sexes. Postsuturals 3. Preacrostichals present. 

 Costal spine strong. Squamae longer than wide. Male hind 

 tibiae not villous. Male hypopygium not very large. Female 

 hypopygial tergum entire, second hypopygial sternite elongated 

 into a broad sheath densely covered with prickles. Genotype, 

 Sarcophaga prohibita Aid., Sarc. and Allies, 133 (1916). 



Blaesoxiphotheca, new genus. 



Differs from Sarcophaga as follows : Female. Proboscis 

 not as long as head-height. Arista plumose halfway. Eyes 

 proportionately large in front view. Frontals diverging 

 obliquely two belov/ base antennae. Cheeks a little over one- 

 third eye-length. Three postsuturals, preacrostichals present. 

 Strong pair of discal scutellars. Large and strong median 

 marginals on second and third abdominal segments. Apical 

 cell terminating farther from wing-tip. Female hypopygial 

 tergum entire; third hypopygial sternite modified into a re- 

 curved subcylindrical but tapered sheath rounded apically and 

 obliquely shaved off dorsally, in which lies the larvipositor. 

 Genotype, Blaesoxiphotheca caudata, n. sp., being female de- 

 scribed by Aldrich as Sarcophaga coloradensis, Sarc. and Allies, 

 140 (1916). Holotype, No. 21582, U. S. Nat. Mus. 



The holotype of coloradensis Aid. is a male and belongs to 

 Acridiophaga. Its coloration as well as its structural char- 

 acters indicate that it does not belong with the female here 

 named caudata. 



