

Vol. 30, pp. 43-50 March 31, 1917 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



NEW GENERA AND SPECIES OF AMERICAN MUSCOID 



DIPTERA. 



BY CHARLES H. T. TOWNSEND. 



The following are descriptions of new forms of exceptional 

 interest, which it seems desirable to publish at this time. 



Spirobolomyia new genus. 



Genotype, Sarcophaga singularis Aldrich, 1916, Sarcophaga & Allies, 

 184-6. 



Differs from Sarcophaga as follows: Vibrissal axis hardly two-thirds 

 head-height. Vibrissae not constricting facial plate. Proboscis about 

 three-fourths head-height. Frontals diverging obliquely two bristles 

 below base of antennae. Parafacials about half as wide as clypeus. 

 Cheeks less than half eye-length. Preacrostichals present but very small. 

 Lateral scutellars two. Hind tibiae of male with only short villosity on 

 distal half or less. No median macrochaetae on second or third abdomi- 

 nal segments. Forceps of male large and carinate. First hypopygial 

 tergite of female entire. 



In addition to the material cited by Aldrich, the National Museum 

 collection contains a specimen reared by Mr. H. S. Barber from a dead 

 Julus sp., from Jackson's Island, Md. 



Thelyiepticocnema new genus. 



Genotype, Sarcophaga incurva Aldrich, op. cit. , 260-2. 



Differs from Sarcophaga as follows: Vibrissal axis much less than head- 

 height and slightly less than antennal axis. Clypeus not as wide, the 

 epistoma but moderately projected. Vertex of male over two-thirds 

 width of one eye, that of female nearly eye-width. Both verticals devel- 

 oped in male. Frontals diverging one bristle or so below base of anten- 

 nae. Frontalia of male over twice as wide as one parafrontal in middle, 

 those of female slightly less than same. Cheeks of male hardly two-thirds 

 eye-length, those of female over two-fifths same. Preacrostichals present. 



13— Proc. Biol. Soc. Wash., Vol. 30, 1917. (43) 



