134 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. G3. 



Type locality. — Washington, District of Columbia. 



Type— Cat.'^o. 25466, U.S.N.M. 



Redescribed from the type specimen. The male type from Wash- 

 ington does not represent the same species as the female and is there- 

 fore not described here. Two females from Virginia and Maryland, 

 belonging to the type series, also represent different species. They 

 too remain undescribed. 



The characteristics which distinguished this species are as follows: 

 The finely reticulate frons; the slightly flattened and truncately 

 excised mesonotum; the polished and regularly shaped abdomen; 

 and the hyalme wings without cilia on the anterior pair. 



24. LEPTACIS ACICULATA, new species. 



Plate 1, figs. 16, 17. 



Female. — Length 1.27 mm. Head about as wide as the thorax, 

 full behind the eyes; frons transversely aciculate in a manner com- 

 mon to many species of Platygaster; vertex separated from the occiput 

 by a high, sharp ridge; occiput shagreened; antennae rather long and 

 slender, shortly pubescent, thoracic ratio: Length 25, width 17, height 

 20; mesonotum convex, shagreened, sparsely covered with short white 

 hairs; notauli absent; mesonotum behind with a short U-shaped plate 

 extending over the fovea to the scutellum; fovea traversed by short 

 white hairs; scutellum highly convex, densely covered with short 

 white hairs; spine of scutellum verj^ short, acute, directed upwards; 

 abdomen 0.62 mm. long, elliptical, two-thirds as wide as long, a little 

 longer than the thorax, pointed apically ; second tergite a little longer 

 than wide, polished, without sculpture; next three tergites short, 

 subequal in length, narrowing rapidly toward the apex, polished; last 

 tergite triangular, not quite as long as the three preceding united, 

 polished, considerably wider than long; wings slightly brownish, the 

 anterior pair without cilia. Black; mandibles, base of scape, tro- 

 chanters, most of anterior tibiae, and all tarsi (except the last joint 

 of each) yellow; antennae brown and fuscous, the club darker; rest 

 of legs brown and black, with varying shades of each, the bases of 

 the tibiae, as is usual in this group, lighter. 



Male. — Length 1 mm. Similar to the female in most respects. 

 Antennae, especially the scape, rather long and slender; abdomen as 

 long as the thorax but distinctly narrower, elliptical, broadly rounded 

 posteriorly, two-thirds as wide as long; apex of second tergite with a 

 narrow shagreened band (more distinct in some specimens than in 

 others) ; tergites following the second narrow, each traversed apically 

 by a narrow shagreened band. Black; appendages as a whole lighter 

 colored than in the female; the antenna may be yellow with the 

 terminal joints a little darker or the whole antenna may be yellowish 

 brown or blackish, always darker distally; the legs likewise vary 



