56 Hymenoptiera in America North of Mexico 



Genus NEMATINUS Rohwer 



Nemafimis Rohwer, 1911. U. S. Dept. Agr., Bur. Ent. Tech. Ser. 20: 99. 

 Type-species: Tenthredo abdominalis Panzer. Orig. desig. 



A holarctic genus which is found in North America from N. S. to Alaska south to N. Y., Mich., 

 S. Dak., Colo., and Calif. This genus has not been studied, and the following is merely a list of the 

 described species with their type localities. 



ochreatus (Rohwer). N. B. (St. John). 



Pteronus ochreatus Rohwer, 1910. U. S. Natl. Mus., Proc. 38: 198. 9. 



oronus (Kincaid). Alaska (Yukatat Bay). 



Pachynematus oronus Kincaid, 1900. Wash. Acad. Sci., Proc. 2: 347. 9. 



pontanioides (Marlatt). Oreg. (Mt. Hood). 



Neinatus pontanioides Marlatt, 1896. U. S. Dept. Agr., Div. Ent. Tech. Ser. 3: 89. 9. 

 unicolor (Dyar). N. Y. (Keene Valley). Host: Betula alba. 



Neynatus unicolor Dyar, 1895. Amer. Ent. Soc, Trans. 22: 308. Larva. Dyar's description 

 precedes that of Marlatt, 1896; previous listings give Marlatt as author. 



Genus PACHYNEMATUS Konow 



Pachynemattis Konow, 1890. Deut. Ent. Ztschr., pp. 233, 238, 246. 



Type-species: Nematiis capreae Panzer. Desig. by Rohwer, 1911. 



Known hosts for this genus in North America are grasses, sedges, and dock. Some species in 

 Europe also feed on Salicaceae and Coniferae. Several species reared from wheat and other 

 grain crops may be of economic importance. So far as is known, the grass feeding species are 

 single brooded with the flight and feeding activities occurring early in the spring. Some of the 

 species on sedges apparently have several generations a year. Very little biological work has 

 been done. The taxonomy of this genus is almost entirely based on males. Females of a number 

 of species cannot be separated; consequently, the lists of unplaced taxa below. Larvae are com- 

 monly collected, but so few have been associated with the adults that it is impossible to identify 

 them except to genus. 



Taxonomy: Ross, 1945. Ent. Soc. Wash., Proc. 47: 105-120 (key to N. Amer. species). 

 —Benson, 1948. Ent. Monthly Mag. 84: 58-65 (British species). —Benson, 1962. Brit. Mus. 

 (Nat. Hist.) Ent., Bui. 12: 405-406 (holarctic species). —Benson, 1963. Roy. Ent. Soc. 

 London, Proc, Ser. B: Taxonomy 32: 162-164 (Rumicis group). 



Species Group Clitellatus 



anolita Ross. Kans., Tex., Mont., Colo. Host: Wheat. 



Pachynematus apicalis Marlatt, 1896. U. S. Dept. Agr., Div. Ent. Tech. Ser. 3: 107. 6. 



Preocc. in Pachynematus by apicalis Hartig. 

 Pachynematus anolita Ross, 1951. In Muesebeck et. al., U. S. Dept. Agr., Agr. Monog. 2: 

 39. N. name for apicalis Marlatt. 

 auratus Marlatt. N. Y., Ohio, Ind., 111., Iowa, Kans., Mont. 



Pachynemattis auratus Marlatt, 1896. U. S. Dept. Agr., Div. Ent. Tech. Ser. 3: 99. 9, d. 



clibrichellus (Cameron). N. H. to Alaska; arctic Eurasia. Host: Carex. 

 Nematus clibrichellus Cameron, 1878. Fauna Scotland, v. 1, p. 32. cJ. 

 Nematus Thomsoni Cameron, 1882. Ent. Soc. London, Trans., p. 540. 9, d. 

 Nematus clibrichensis Cameron, 1885. Monog. Brit. Phytophagous Hym., v. 2, p. 88. 6. 

 Pachynematus pubescens Marlatt, 1896. U. S. Dept. Agr., Div. Ent. Tech. Ser. 3: 100. 9. 

 Pachynematus gotarius Kincaid, 1900. Wash. Acad. Sci., Proc. 2: 348. 6. 

 Pachynematus venustus MacGillivray, 1921. Calif. Acad. Sci., Proc. (ser. 4) 11(14): 190. 9, 



6. 

 Pachyyiematus vermis MacGillivray, 1921. Calif. Acad. Sci., Proc. (ser. 4) 11(14): 191. 6. 



clitellatus (Lepeletier). Labrador, Que.; Europe. Introduced ?. Host: Gramineae. 



Tenthredo capreae Panzer, 1799. Faunae Ins. German, v. 6, p. 65, t. 8. Preocc. by Linnaeus, 



1758. 

 Nematus clitellatus Lepeletier, 1823. Monog. Tenthred., p. 62. 9. 

 Nematus trisignatus Foerster, 1854. Naturh. Ver. Rheinlande, Verb. 11: 292. 9. 



