416 U. S. NATIONAL MUSEUM BULLETIN 2 1 6 part 3 



front, the rest fulvous or brownish fulvous; hind coxa fulvous; tro- 

 chanters fulvous, the front ones often paler below and darker above; 

 front and middle femora and tibiae fulvous, the tibiae weakly infuscate 

 above; front and middle tarsi fuscofulvous, their fii'st segment darker 

 and last segment brown; hind femur fulvoferruginous, its apical 0.25 

 to 0.6 black or fuscous; hind basitarsus black, narrowly white at base, 

 its apex sometimes white; segments 2-4 of hind tarsus white; segment 

 5 of hind tarsus black; front wing often with a faint median infusca- 

 tion; ground color of first abdominal segment ferruginous, sometimes 

 partly infuscate; second tergite often stained with fulvous or ferrugi- 

 nous. The white markings on head and body are often smaller than 

 described and figured. 



Type: 9, Cheboygan Co., Mich., July 25, 1947, R. R. Dreisbach 

 (Dreisbach). 



Paratypes: cf , Ann Arbor, Mich., May 4, 1959, H. and M. Townes 

 (Townes). 4cr, collected on Alnus at edges of sedgy meadows, July 

 25, 26, 27, and 29, 1959, Huron Mts., Marquette Co., Mich., H. 

 Townes (Townes). 29, from sand pits, Ottawa, Ont., June 28, 1940, 

 Ed. G. Lester (Ottawa), c?, Alberton, P. E. I., July 15, 1940, G. S. 

 Walley (Ottawa). 9, Gracefield, Que., June 25, 1937, F. A. Urquhart 

 (Ottawa), cf , Laniel, Que., June 4, 1944, A. R. Brooks (Ottawa). 

 Sd', Montigny, Que., June 11, 1941, O. Peck and G. S. Walley 

 (Ottawa), cf , Falls Church, Va., May 17, N. Banks (Cambridge), 

 cf , Vienna, Va., Apr. 22, 1913, R. A. Cushman (Washington). 9, 

 Cheat Mt., 2,000 ft., Randolph Co., W. Va., June (Pittsburgh). 



This species occurs in northeastern United States and southeastern 

 Canada. 



3. Listrognathus (Listrognathus) nubilipennis (Cresson) 



Mesostenus nubilipennis Cresson, 1878, Canadian Ent., vol. 10, p. 205; 9- Type: 

 9, Georgia (Philadelphia). 



Male: Unknown. 



Female: Front wing 6.5 mm. long. Similar in general to the female 

 of L.femorata except that hind coxa has a white spot on its upper side, 

 hind femur is ferruginous with its tip fuscous, and front wing has a 

 more distinct median infuscation. 



Known only from the type, a female from Georgia. 



4. Listrognathus (Listrognathus) nigrescens, new species 



Figure 335,c 



Front wing 5.5 to 8.0 mm. long; frontal horn medium sized; propo- 

 deum with moderately prominent crests, its apical carina between the 

 crests rather weak in male, obsolescent in female; postpetiole moder- 



