NO. 2197. NEW PARASITIC HYMENOPTERA—GAHAN. 215 



Eight specimens recorded in the Bureau of Entomology under 

 Webster No. 11815, and reared according to C. N. Ainslie from 

 Mordellistena, species. This species may be distinguished from all 

 other species having a single bristle on the submarginal vein by the 

 pale band at the base of the abdomen. Named for the collector, 

 C. N. Ainslie. 



TETRASTICHUS DOLOSUS, new species. 



Female. — Length 1.3 mm. Falls in the group having more than 

 one bristle on the submarginal vein. Frons, vertex, and occiput finely 

 sculptured ; antennae rather short, the pedicel about equal to the first 

 fiinicle joint, three fiinicle joints subequal and subquadrate ; club 

 about as long as the funicle but broader, three-jointed, the two basal 

 joints slightly transverse, the apical joint shorter and conical; appar- 

 ently a single ring- joint. Mesoscutum and scutellum finely and 

 closely lineolate; parapsidal grooves deep, praescutum divided by a 

 complete but faint median groove; scutellum convex with two dis- 

 tinct longitudinal grooves; metanotum smooth; propodeum practi- 

 cally smooth Avith a median longitudinal carina; marginal vein 

 slightly thickened. Abdomen conic-ovate, about equal to the thorax 

 in length, the tergites finely sculptured except the base of first which 

 is smooth. Antennae black ; head, thorax, abdomen, all coxae and all 

 femora metallic blue-green; all femora narrowly at apex, all tibiae 

 and all tarsi pale, the apical tarsal joint brownish. Wings hyaline, 

 venation brownish. 



Male. — The single specimen lacks the head. In the available char- 

 acters it is like the female, except slightly smaller, with the abdomen 

 narrower and nearly elliptical, and the propodeum more distinctly 

 sculptured. 



Type-locality. — Tallulah, Louisiana. 



Type.— C?it. No. 20395, U.S.N.M. 



Hosts. — Euplectrus platyhypenae and Euplectnis comstocki. 



Two female specimens reared by K. A. Vickery at Tallulah, Louisi- 

 ana, from Euplectrus platyhypenae parasitizing Laphygma frugi- 

 perda and recorded under Webster No. 6439. Also five specimens in- 

 cluding the allotype from Wellington, Kansas, reared by T. S. 

 Wilson under Webster No. 12450 and labeled as reared from Euplec- 

 trus comstocki parasitizing Caradrina, species. 



The type of this species bears the same locality label and Webster 

 number as do the types of Tetrastichus euplectH Gahan, previously 

 described and appears to have been from the same rearing. The two 

 species are quite distinct from each other, however, and may be 

 easily separated by the fact that euplectri has much longer antennal 

 joints, only one bristle on the submarginal vein, and the femora all 

 pale. 



