ICHNEUMON-FLIES, PART 2\ EPHIALTINAE 



257 



1. Acrotapus wiltii (Cresson), new combination 



Figure 324,f 



Epimecis Wiltii Cresson, 1870, Trans. Amer. Ent. Soc, vol. 3, p. 143; ?. Type: $, 



Ohio (Philadelphia). 

 Biology: Shannon, 1913, Proc. Ent. Soc. Washington, vol. 15, p. 162. 



Front wing of male 7.5 to 1 1 mm. long, of female 7.5 to 15 mm. long; 

 ocelli very large, the lateral ocellus almost touching eye; temple weakly 

 concave; occipital carina very high, a little reflexed. 



Fulvous. Head and antenna black, the clypeus brown apically; 

 mouth parts stramineous; apex of abdomen, beginning with the sixth 

 or seventh segment, black or infuscate; wings light fulvous, the front 

 wing with a median and apical transverse fuscous band, the hind wing 

 with a weak infuscation centered at origin or radius. 



Shannon (loc. cit.) reports finding the larva of this species attached 

 to the thorax (!) of Epeira trivittata, on Sept. 14, 1913. The spider 

 was put in a breeding jar, where it spun a web. The larva grew 

 rapidly, killed the spider on the sixth day, spun its cocoon in the 

 spider's web, and emerged as an adult on Oct. 1, 1913. 



Figure 111. — Localities for 

 Acrotaphus wiltii. 



The cocoon of Shannon's specimen is fusiform, 7 mm. by 20 mm., 

 more densely woven than in Polysjthincta but still rather loose and 

 somewhat transparent, with a weakly wrinkled surface, and sur- 

 rounded by a thin layer of looser silk. It is medium brown in color 

 and has a small hole at the hind end. 



Specimens (52 cf, 659): From Alabama (Pyriton); Connecticut 

 (East River, Lebanon, and Volun town) ; Florida (Gainesville) ; Georgia 

 (Atlanta and Dewitt); Kansas (Lawrence and Onaga); Maine (Casco 

 and Kokadjo); Manitoba (Aweme); Maryland (Cabin John, Glen 

 Echo, and Plummers Island) ; Massachusetts (Cohasset and Sherborn) ; 

 Michigan (Cheboygan Co., East Lansing, Gull Lake Biological Station 

 in Kalamazoo Co., Isabella Co., Lake City, and Muskegon Co.); 



