PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM issued l^jfv yl v)?^ h i^e SMITHSONIAN INSTITUTION U. S. NATIONAL MUSEUM Vol. 98 Wa5hington: 1948 No. 3225 PARASITIC WASPS OF THE GENUS TRIMORUS IN NORTH AMERICA By Robert M. Fouts Arnold Foerster established the genus Trimorus in 1856/ indi-cating as representatives Gryon nanno Walker and Gryon phlias Wal-ker. These two species differed from other species of Gryon Walker in having the parapsidal grooves distinct, the metanotum aimed with a strong though short spine, and the abdomen elongate. Foerster, not having before him any specimens referable to Trimorus, stated erroneously that the genus was characterized by having the marginal vein short and the postmarginal vein very long. According to Kieff er ^ the types of nanno and phlias have the marginal vein very long and the postmarginal vein absent. Ashmead in 1893 ^ perpetuated F'oer-ster's error when he redescribed Trimorus and included his new species americanus. This species has been made the type of the genus Pro-trimorus Kieffer. Ashmead's numerous species of Prosacantha * were removed from that genus by KieflPer in 1908,* and, since they differed from Hoplo-gryon Ashmead only in the relative length and width of the petiole, a character of doubtful generic value, they were referred to that genus. Alan P. Dodd, in 1930,® wrote a paper on the Australian Teleasinae in which he described many new Australian species and discussed the relationships of the genera, presenting a key to all those recognized by him. He showed that the two genera Trimorus Foerster and Hop-1 Hymenopterologische Studien, vol. 2, pp. 101, 104, 1856. s Ann. See. Sei. Bruxelles, vol. 32, p. 191, 1908. ' U. S. Nat. Mus. Bull. 45, p. 138, 1893. « Ibid., pp. 185-198. » Ann. Soc. Sci. Bruxelles, vol. 32, p. 200, 1908. « Proc. Linn. Soc. New South Wales, vol. 55, pp. 41-91, 1930. 91
BioStor
