PROCEEDINGS OF THE Entomological Society of Washington VOL. 27 MAY 1925 No. 5 NEW SERPHOID PARASITES FROM THE UNITED STATES (HYMENOPTERA). Bv RoBKR'r M. FouTS. This paper contains descriptions of twenty-four new species and one new genus of Hymenoptera belonging to the families Platygasteridae, Diapriidae and Scelionidae. All measurements except of antennal joints were made with a Bausch and Lomb binocular microscope, 24 mm. objective, No. 5 ocular and a micrometer disc ruled to five mm. in .05 mm. divi-sions. Each division equals approximately .0108 mm. Measure-ments of antennal joints were made with a Bausch and Lomb compcjund microscope, 4 mm. objective. No. 5 ocular, 160 mm. draw tube, and a micrometer disc ruled to five mm. in .05 mm. divisions. The measurements made are close but only approximately correct. A difference of .002 mm. in antennal measurements means nothing. All measurements of a particular part are of its greatest dimensions. The publication referred to as " (Fouts, 1924) " is the author's recent paper entitled, "Revision of the North American Wasps of the Subfamily Platygasterinae. " It was published in the Proceedings of the United States National Museum, Vol. 63, 1924, pp. 1-145. L'nless otherwise mentioned the type material described below is in the author's collection. Superfamily SERPHOIDEA. Family PLATYGASTERIDAE. Trichacis cornuta, new species. Female. — Length, 1.53 mm. Runs to cornicola in the author's key (Fouts, 1924, p. 13). Differs from cornicola and texana in having lateral projections on the cheeks. Length of head 20, width 48; frons polished; occiput without sculpture medially; cheeks just above the middle of the compound eyes with a sliarji laterally projecting tooth; pedicel a little over twice as long as wide, dis-tinctly but only very slightly wider than any of the four following joints, a little longer than joint four which is cylindrical, twice as long as wide; length of thorax 55, width 40, height 44; notauli distinct only on basal third of mesonotum; length of abdomen 67; length of second tergite 42, width 42; first tergite as in texana; interfovcal area on second tergite with many short fine carinae; second tergite, except as just mentioned, and all following tergites, polished, without distinct
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