ART. 15». REVISION OF SUBFAMILY PLATYGASTERHSTAE FOUTS. 93 



58. PLATYGASTER LINEARIS, new name. 



Polymecus lasiopterae Gahav, Proc. U. S. Nat. Mus., vol. 53, 1917, p. 217. (Pre- 

 occupied by loftiopterae Kieffer and Jorgensen, Centralb., Bakt. Paras. 

 Insect., pi. 27, 1910, p. 401.) 



Gahan's description should be used in connection with my own. 



Female. — Length 1.22 mm. Head not quite twice as wide as long, 

 slightly emarginated posteriorly, wider than the thorax, without dis- 

 tinct sculpture of any sort; antennae short, the pubescence not visible 

 except under the high power of the microscope; relative proportions 

 of theantennal joints as follows: Length, 40, 14, 5, 7, 8, 10, 10, 10, 10, 

 15: width, 8, 7, 5, (3, 6, 7, 8, 8, 8, 8; thoracic ratio: Length 15 (0.333 

 mm.), width 9, height 12; mesonotum convex, polished, its narrow, 

 rounded median lobe touching the scutellum; notauli very faint and 

 short, diverging rapidly anteriorly; abdomen nearly twice as long as 

 the head and thorax united, remarkably flat, polished, with little 

 pubescence except near its tip; second tergite not quite as wide as 

 the thorax, longer than wide; basal foveae small, with a few faint 

 striae at their apices; segments three to six united nearly twice 

 as long as the second: wings hj^aline, iridescent, reaching to the apex 

 of the fourth segment. Black; base of scape, trochanters, all tibiae 

 at base, and all tarsi, more or less testaceous. 



Male. — Length 1 mm. Pedicel twice as long as wide, as wide as 

 joint five; third joint broadly transverse, button shaped, a little 

 wider than the pedicel: fourth joint as thick as the scape, less than 

 twice as long as wide, only slightly curved; joint five about as long 

 as ^\'ide, as wide as the pedicel; following joints to the tenth subequal, 

 longer than wide, as wide as the fifth; tenth joint sharply pointed, 

 as long as the third and fourth united: abdomen elliptical, nearly 

 three times as long as wide, as wide as the thorax, a little longer 

 than the head and thorax united, rounded apically; wings reaching 

 beyond the apex of the abdomen, with short cilia marginally. 



Type locality. — ^Elk Point, South Dakota. 



Type.— C&t. No. 20397, U.S.N.M. 



Redescribed from the type series, six females and one male, reared 

 by C. N. Ainslie from Lasioptera species infesting MuJtlenhergia. 

 The specimens are recorded in the Bureau of Entomolgy under 

 Webster No. 11838. 



59. PLATYGASTER ERRANS, new species. 



Platygaster laficeps AsnyfExx), Bull. 45, U. S. Nat. Mus., 189;'., p. 311 (female, 

 not male) . 



FemaU. — Length 1.7 mm. Head a little over twice as wide as 

 long, more or less lenticular in shape, not excavated behind, the cheeks 

 oblique and narrow, subconvex; occiput very strongly transversely 

 striate; cheeks shagreened; vertex rounded, striate; interocellar area 



