526 U. S. NATIONAL MUSEUM BULLETIN 216 



a distinctly elevated median area between the median longitudinal 

 carinae; first sternite of male surpassing spiracle by about 1.3 its 

 average width; first sternite of female surpassing spiracle by about 

 0.5 its average width. 



There are two subspecies, separable on color as keyed and described 

 below: 



1. Head and thorax black or blackish; range: Canadian, Alleghanian, and 



Carolinian faunas 20a. sligmapterus stigmapterus (Say) 



Head and thorax dusky ferruginous or ferruginous; range: Austroriparian 

 fauna 20b. stigmapterus florid amis (Ashmead) 



20a. Xorides (Xorides) stigmapterus stigmapterus (Say) 



Acoenitus stigmapterus Say, 1824, in Keating, Narrative of an expedition to the 

 source of St. Peter's River . . . , vol. 2, appendix, pt. 1, p. 325 (Leconteed., 

 vol. 1, p. 218); 9- Type: 9, North-west Territory (type destroyed). 



Xylonomus tartarus Morley, 1913, Fauna of British India . . ., Hymenoptera, 

 vol. 3, p. 78; 9- New synonymy. Type: 9, "India" (Oxford). 



Black, the temple sometimes tinged with ferruginous. Clypeus 

 brownish; mandible tinged with ferruginous; female flagellum with 

 a white band covering about five segments; apical margin of femora, 

 sometimes apical margin of front and middle tibiae of male, basal 

 0.12 of all tibiae, basal 0.5 ± of basitarsi, fourth segment of tarsi, 

 often more or less of third tarsal segment, and sometimes second 

 segment of front tarsus of male, white; front femur and tibia of male 

 often brownish in front. 



The type of Xylonomus tartarus is a specimen from the J. O. West- 

 wood collection, labeled "India." It belongs to the present subspecies. 

 It is not from India, but possibly from Indiana. We have seen two 

 other ichneumonids in the Westwood collection labeled "India" 

 which are actually from eastern North America. One of these is the 

 type of Exochilum diabolus Morley 1913, also described by Morley 

 from "India." E. diabolus is a synonym of Therion tenuipes (Norton) 

 1863 (new synonymy), from eastern North America. 



Specimens (19 d\ 1189): From Alaska (Eklutna Lake at 1,000 

 ft.) ; Alberta (Bilby) ; British Columbia (Summit Lake at Fort Nelson) ; 

 Connecticut (Pleasant Valley); Delaware (New Castle Co. and 

 Wilmington); District of Columbia (Washington); Iowa (Ames); 

 Kansas; Labrador (Goose Bay); Maine (Blackwood Camp in Acadia 

 National Park, Brewer, Lincoln Co., and Tim Pond Plantation); 

 Manitoba (Fort Churchill and Gillam) ; Maryland (Beltsville, College 

 Park, Plummers Island, and Takoma Park) ; Massachusetts (Amherst, 

 Milton, and Petersham); Michigan (Lake Charlevoix in Charlevoix 

 Co., Chatham, Cheboygan, Douglas Lake in Cheboygan Co., East 

 Lansing, Isle Koyale, Lake City, St. Ignace, 12 miles west of Stephen- 

 son, Washtenaw Co., and Whitefish Point in Chippewa Co.); Min- 



