126 U. S. NATIONAL MUSEUM BULLETIN 216 



12. Triclistus melanocephalus (Cameron), new combination 



Figure 187,k 



Exochus melanocephahis Cameron, 1886, Biologia Centrali-Americana, Insecta, 

 Hymenoptera, vol. 1, p. 280; "&"= 9 . Type: 9 , Northern Sonora, Mexico 

 (London). 



Triclistus thoracicus Ashmead, 1896, Trans. Amer. Ent. Soc, vol. 23, p. 201; 

 9 (new synonymy). Type: 9, Dixie Landing, Va. (Washington). 



Male: Unknown. 



Female: Front wing 4.5 to 6.3 mm. long; face rather strongly mat, 

 its punctures rather small, their interspaces about 0.6 their diameters; 

 temple almost flat, its hairs numerous next to eye and occipital carina, 

 medially very sparse or absent in some areas; metapleurum without 

 hairs; median longitudinal carinae of propodeum absent except for 

 basal and apical pairs of short stubs; hairs on area of second lateral 

 area of propodeum sparse; median apical area of propodeum about 

 0.45 as long as wide; hind spur of hind tibia about 3.0 as long as wide 

 (including hairs) ; second segment of hind tarsus about 2.7 as long as 

 wide; first tergite unusually flat, about 1.4 as long as wide, its dorsal 

 carinae extending about 0.30 its length; tergites without bans except 

 laterally, the number of hairs per tergite increasing towards the pos- 

 terior tergites; apical notch of subgenital plate about 0.3 as deep as 

 wide. 



Head blackish; body ferruginous. Face usually more or less 

 ferruginous; antenna ferruginous brown, paler basally and below; 

 mandible brownish ferruginous, a little infuscate basally; palpi and 

 tegula pale yellow; legs fulvous; abdomen sometimes infuscate 

 apically. 



Specimens: 9, Madera Canyon at 5,600 ft., Santa Rita Mts., Ariz., 

 Aug. 14, 1949 (Townes). 9, Oak Creek Canyon, Ariz., May 20, 1947, 

 H. and M. Townes (Townes). 29, Parker Creek, Sierra Ancha, Ariz., 

 May 2 and 7, 1947, H. and M. Townes (Townes). 29, Hummers 

 Island, Md., June 22 to 23, 1912, and Sept. 2, 1912, H. S. Barber 

 (Washington). 9, Clare Co., Mich., July 3, 1938, R. R. Dreisbach 

 (Washington). 9, Livingston Co., Mich., Aug. 28, 1950, R. R. 

 Dreisbach (Dreisbach). 29, Moorestown, N. J., July 23, 1939, and 

 Aug. 2, 1939, H. and M. Townes (Townes). 29, Big Indian Valley, 

 Catskill Mts., N. Y., July 31, 1905, and Aug. 8, 1905, R. F. Pearsall 

 (New York). 9, Wake Co., N. C, June 12, 1951, H. and M. Townes 

 (Townes). 9, Crystal Beach, Madoc, Ont., July 26, 1951, A. P. 

 Arthur (Martin). 29, Thunder Bay Beach, Ont., June 1943 and July 

 1943, H. S. Parish (Townes). 29, West Chester, Pa., July 8, 1902, 

 J. C. Bradley (Ithaca). 29, Kirks Ferry, Que., Aug. 15, 1950, B. P. 

 Beirne (Ottawa). 29, Knowlton, Que., July 11 and 28, 1936, G. S. 



