714 Hymenoptera in America North of Mexico 



validus Dasch. Mass. and s.e. Alta., s. to e. N. C, n.w. S. C, n. La., Okla., s. Ariz, and central 

 Calif. 



Mesoclwrus validus Dasch, 1971. Amer. Ent. Inst., Mem. 16: 130. S, 9. 

 varianus Dasch. Newfoundland (insular) w. to central Alta. and s.w. B. C, s. to n.w. S. C, s. 

 Wis., Minn., and n.w. Oreg. Host: Lamachus angularius (Davis). 



Mesociiorus variamis Dasch, 1971. Amer. Ent. Inst., Mem. 16: 150. 6,9. 

 vittator (Zetterstedt). Newfoundland (Labrador) w. to n.w. Alaska, s. to Ala., w. Tex., Ariz., 

 and s. Calif.; Eurasia; Mexico, Costa Rica. Ecology: Reared or presumed to have been 

 reared from parasites of two species of Tenthredinidae and many species of 

 Lepidoptera (too numerous to list) of diverse habits. Host: Diadegma insulare (Cr.), 

 Dimophora sp., "Hyposoter annidipes (Cresson)" ex Lambdina fiscellaria lugubrosa 

 (Hulst) and Nepytia umbrosaria nigrovenaria (Pack.), Phobocampe n. sp., P.flavipes 

 (Prov.), Apanteles glomeratus (L.)?, A. medicaginis Mues.?, Microgaster peroneae Wly. 

 M. vittator is apparently by far the most frequently collected species of Mesochorus in 

 North America. 



Tryphon vittator Zetterstedt, 1838. Ins. Lapponica Descr., Hym., p. 387. 9. 



Mesochonis brunneus Brischke, 1880. Naturf. Gesell. Danzig, Schr. (n. f.) 4: 184. 6. 



Campoplex pieridicola Packard, 1881. Boston Soc. Nat. Hist., Proc. 21: 20. "9" = 6. 

 yosemite Dasch. Colo., s. Idaho, n.e. Calif. 



Mesochorus yosemite Dasch, 1971. Amer. Ent. Inst., Mem. 16: 196. 9. 



Genus STICTOPISTHUS Thomson 



Stictopisthus Thomson, 1886. Soc. Ent. de France, Ann. (6) 5: 327, 344. 



Type-species: Stictopisthus bilineatus Thomson. Desig. by Viereck, 1914. 



This is a moderate sized genus of worldwide distribution. 



argaleus Dasch. Que., s. Sask., and w. Yukon, s. to Md., w. N. C, and n.w. Ark. Ecology: Should 

 be presumed as having been reared from parasites of the following- Tortricidae 

 {Archips argyrospilus [Wlk.], Choristoneura pinus Free., C. rosaceana [Harris], and a 

 "tortricid sp."), Pyralidae {Desmia funeralis [Hbn.], Nephopteryx subcaesiella [Clem.]), 

 Yponomeutidae (Zelleria haimbachi Bsk.), Gracilariidae {Lithocolletis robiiiiella Clem.), 

 and a leaf miner on Robinia pseudoacacia. The paratypes in the U. S. Natl. Museum 

 collection show considerably more variation than is allowed for in either Dasch's key to 

 Stictopisthus females or in his description of argaleus (the key and description also 

 disagree with each other in respect to the dimensions of the ovipositor sheath), and two 

 species may be confused under the name argaleus. 

 Stictopisthus argaleus Dasch, 1971. Amer. Ent. Inst., Mem. 16: 277. 6,9. 



artus Dasch. N. Y., s. Ind., w. Mont. 



Stictopisthus artus Dasch, 1971. Amer. Ent. Inst., Mem. 16: 283. 6,9. 



bilineatus Thomson. Southern Sask. s. to w. Tex., w. to s. Alta., Wash., and s. Calif.; s. Mexico; 

 Europe. Ecology: Can be presumed to have been reared from parasites of the following 

 microlepidoptera- Scythris sp. and Plutella xylostella (L.). 

 Stictopisthus bilineatus Thomson, 1886. Soc. Ent. de France, Ann. (6) 5: 344. [male, 

 female]. 



crenatus Dasch. Newfoundland (Labrador), w. N. W. T., and s.w. Alaska, s. to N. J., Mich, and 

 n. Idaho. Ecology: Can be presumed to have been reared from parasites of the following 

 microlepidoptera-- Gracilaria burgessiella Zell., Lithocolletis sp., Acleris sp., and 

 C horisto7ieura pinus Free. 

 Stictopisthus crenatus Dasch, 1971. Amer. Ent. Inst., Mem. 16: 281. cJ, 9. 



electilis (Cresson). Eastern N. C, n.w. S. C, Kans., Okla., Tex., s.e. Ariz.; Mexico. 

 Mesochorus electilis Cresson, 1872. Amer. Ent. Soc, Trans. 4: 171. 9. 



exilis Dasch. Central Utah. Known only from the holotype. 



Stictopisthus exilis Dasch, 1971. Amer. Ent. Inst., Mem. 16: 287. 6. 



flaviceps (Provancher). Que. w. to w. N. W. T., s. to Md., n.w. S. C, Mo., Colo., and n. Calif. 

 Ecology: Can be presumed to have been reared from parasites of the following- 

 Tortricidae (Archips argyrospilus [Wlk.], C horistoneura fumiferana [Clem.], C. pinus 



