SuperfamOy ICHNEUMONOIDEA 379 



Exyston variatus Provancher, 1879. Nat. Canad. 11: 249. 9. Preocc. by Provancher, 1877. 

 Contrary to the discussion of Barron (1975), Provancher indicated this as being a 

 description of a new species. The variant spelling "vaiatus" also appears on p. 249. 



Exystoti abdominalis var. rnfinus Davis, 1897. Amer. Ent. Soc, Trans. 24: 239. 9. 



Taxonomy: Barron, 1975. Nat. Canad. 102: 581 (discussion of lectotype). 

 venustum (Cresson). S. Dak., Sask., Colo., Utah, B. C, Wash. 



Cteniscus venustus Cresson, 1865. Ent. Soc. Phila., Proc. 4: 263. 9. 



Genus SMICROPLECTRUS Thomson 



Microplectron Foerster, 1868. Naturh. Ver. Rheinlande, Verb. 25: 195. Preocc. by Streubel, 

 1842 and Dahlbom, 1857. 



Type-species: Exenterus erosus Holmgren. By subsequent monotypy from inclusion 

 by Woldstedt, 1877 (1876). 

 Smicroplectuis Thomson, 1883. Opusc. Ent. 9: 888. 



Type-species: Exenienis jucuvdus Holmgren. Desig. by Viereck, 1914. 

 Anderis Davis, 1897. Amer. Ent. Soc, Trans. 24: 233. 



Type-species: Cteniscus albilineatus Walsh. Desig. by Viereck, 1914. 

 Auderis Davis, 1898 (1897). Amer. Ent. Soc, Trans. 24: 348 (errata). Emend. 



Revision: Mason, 1956. Canad. Jour. Zool. 34: 124-151 (including Excavanis). 

 apicatus (Provancher). Que., Maine, N. Y., Ont., Colo., Alta., B. C. Host: Nematus currani 

 Ross. 



Cte7iiscus apicatus Provancher, 1879. Nat. Canad. 11: 263. "3" = 9. 

 californicus (Cresson). Que. w. to B. C, s. to N. C, Minn., Ariz., and Calif. 



CtenistesH) califoniiciis Cresson, 1879 (1878). Acad. Nat. Sci. Phila., Proc. 30: 374. 6. 



Smicroplectrus disseptus Walley, 1933. Canad. Ent. 65: 256. 9. 

 eburneus Mason. Ont., Tex. 



Smicroplectrus eburneus Mason, 1956. Canad. Jour. Zool. 34: 141. 9. 

 incompletus Walley. N. S. w. to Alta., s. to Pa. and Ariz. Host: Pikonema sp. 



Smicroplectrus incompletus Walley, 1937. Canad. Ent. 69: 134. 9. 

 jucundus albilineatus (Walsh). Que. w. to Alaska, s. to Colo, and Calif. S. jucundus jucundus 

 (Holmgren) is Palearctic 



Cteniscus albilineatus Walsh, 1873. Acad. Sci. St. Louis, Trans. 3: 107. "d" = 9. 

 robustus Walley. Que. w. to Alta., s. to N. Y., Mich., and Nev. Ecology: Observed on Populus 

 ovipositing on Nematus sp. Host: Nematus sp. 



Smicroplectrus robiistus Walley, 1937. Canad. Ent. 69: 135. 9. 

 takomae Mason. N. W. T., Alaska, Wash. 



Smicroplectrus takomae Mason, 1956. Canad. Jour. Zool. 34: 131. S, 9. 

 walleyi Mason. Que., N. Y., Pa., Md., Va., Ont., Ohio, Ky., Nebr. 



Smicroplectrus walleyi Mason, 1956. Canad. Jour. Zool. 34: 132. $, 9. 



Genus ACROTOMUS Holmgren 



Acrotomus Holmgren, 1857 (1855). Svenska Vetensk.-Akad. Handl. (n. f.) 1: 222. 



Type-species: Tryphon lucidulus Gravenhorst. Desig. by Viereck, 1912. 

 Delotomus Foerster, 1868. Naturh. Ver. Rheinlande, Verb. 25: 194, 215. Unnecessary n. 

 name for Acrotomus Holmgren. 



Taxonomy: Mason, 1962. Canad. Ent. 94: 1285-1287. 

 succinctus (Gravenhorst). N. Y., Ont., Mich.; Europe. Adventive. 



Tryphon succinctus Gravenhorst, 1829. Ichn. Europaea, v. 2, p. 166. d, 9. 



Genus CTENISCUS Haliday 



Cteniscus Haliday, 1832. In Curtis, Brit. Ent., v. 9, no. 399. 



Type-species: Tryphon sexilituratus Gravenhorst. Monotypic. The type-species is 

 regarded as a synonym of Cteniscus pedatorius (Panzer). 

 Eudiaborus Kerrich, 1952. Brit. Mus. (Nat. Hist.) Ent, Bui. 2: 415. 



