28 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Biology. — Larvae of C. bicarinata as well as larvae of C. pilosissima 

 have been taken from wounds in cacti, C. bicarinata from prickly pear 

 (Opuntia species), and C. pilosissima from maguey (Agave species). 

 No other data are available. 



Genus Dicyphoma James, 1937 



Only 1 species, Dicyphoma schae_fferi (Coquillett) , occm's in the 

 Nearctic area. It is restricted to the southwestern states, where it 

 has been taken from wounded and decaying cacti. 



Generic characters. — As given in key to genera. 



Dicyphoma schaefferi (Coquillett), 1904 



Figures 78, 81, 82 



Description. — Mature larva: length 14.0-15.8 mm, mean 15.2 

 mm; width 3.6-4.1 mm, mean 3.87 mm. 



Biology. — Larvae have been collected from Opuntia (Platyopuntia) 

 species and Myrtillocactus geometrizans in Mexico. 



Material examined. — Mexico : 54 miles north of San Luis Potosi, 

 S.L.P., Aug. 4, 1960, Ryckman, Ryckman and Christianson, ADM 

 61, 2 larvae, WSU; 8 miles south of Aguascalientes, June 19, 1960, 

 ADM 46, Ryckman, Ryckman and Christianson, 1 larva WSU. 

 Texas: El Paso, Aug. 12, 1908, F. C. Pratt, 1 headless puparium, 

 USNM. 



Discussion. — Except for the key characters, there appears to be 

 little difference between the larva of D. schaefferi and that of C. 

 pilosissima. 



Genus Adoxomyia Bezzi, 1908 



James (pers. comm.) lists 11 species for this genus, all of which 

 (except A. subulata, A. lata, and A. rustica) are confined to the south- 

 western and western states. Unfortunately, this group of species is 

 represented by only 3 puparia, all of which lack the head capsule; 

 however, in an attempt to present a complete analysis of the generic 

 characters, 1 have included the description of an Indian species, 

 Adoxomyia heminopla (Wiedemann). 



Generic characters. — As given in key to genera. 



Adoxomyia rustica (Osten Sacken), 1877 



Figures 155, 156 



Description. — Puparium: length 19.6 mm (head capsule missing); 

 width 2.8 mm. Other characters as given in key to genera. 



Biology. — No data available for A. rustica but larvae of A. clari- 

 pennis have been collected from decaying cacti. 



