NO. 2332. VARIO US NEW SPECIES OF HYMENOPTERA—GJRA ULT. 211 



Types.— Cat. No. 20872, U.S.N.M. Three females on tags, a head, 

 fore wing and caudal legs on a slide. 



TRIPOLYCYSTUS CRYPTOGNATHAE, new species. 



Female — Length, 1.05 mm. Short, rather stout. 



Dark metalHc green, the wings hyaline, the venation dusky, the 

 tibiae, tarsi, knees, scape, pedicel, ring-joints, and funicles 1-3 

 brownish yedow; femora washed with metallic, coxae concolorous. 

 Differs from the genotype structurally in that the head is wider than 

 the thorax but only a little so; the scuteUum bears a distinct cross- 

 carina before apex; the propodeum is conical, short at the small 

 round, cephalic spiracle and with no spiracular sulcus; segment 2 of 

 the abdomen is somewhat longer, occupying nearly half the surface. 

 Clypeus projected somewhat as in Tridy7nus but its apical margin 

 is concaved across the meson. 



Head and thorax reticulate-punctate. Propodeum punctate. 

 Caudal tibial spur long and slender. Pedicel a little longer than 

 funicle 1 which is subquadrate. Flagellar joints with scored white 

 marks running their length from near base (like flattened white 

 setae). Club with no terminal nipple, no wider than the thorax. 

 Ring-joints subequal, scape slender, long. Male the same but 

 smaller. 



From numerous pairs reared from pupa of CryptognatJta nodiceps 

 Mskl., July, 1914 (F. W. Urich). Trinidad. 



Types— Csit. No. 20873, U.S.N.M. One male, three females on 



tags and a slide bearing male and female head and female caudal 



legs. 



Genus ARTHROLYTUS Thomson. 



KEY TO NORTH AMERICAN SPECIES. 



Based on the female types. The species apatelae {pimplae) 

 Ashmead belongs rather to Dibrachys; it bears no spiracular sulcus. 

 The genus ArtJirolytus is characterized by the short postmarginal 

 vein and insertion of the antennae (as regard Pteromalus) . 



Scape concolorous: apex of pedicel, funicle and club fulvous. Ring-joints unequal. 

 Coxae, femora and tibiae (except at apex) metallic. Clypeus produced, sinuate 

 at apex, barely striate. Spiracular sulcus deep, distinct, elbowed, nonfoveate. 

 Antennae inserted slightly above the ventral ends of the eyes, a little below the 

 middle of the face. Propodeum with a short neck, tricarinate, the spiracle ellip- 

 tical. ScuteUum simple. A distinct sulcus on dorso-lateral aspect of the pro- 

 podeum. Postmarginal vein subequal to the stigmal. Segment 2 of abdomen 

 short, entire. Pedicel shorter than funicle 1. Mandibles 4-dentate. 

 aeneoviridis Girault. 



The same exactly but more robust, the postmarginal vein slightly longer than the 

 stigmal, the propodeal spiracle more linear and curved (reniform), the median 

 carina of propodeum absent, the lateral carina distinct at the neck only, sepa- 

 rated at base by a round fovea. Mandibles 3 and 4 dentate, the second tooth of 

 the 4-dentate one, minute. Pedicel slightly longer than funicle 1. Legs entirely 

 concolorous except tips of tibiae, knees, tarsi, and most of cephalic tibiae. 

 Jcavsensis, new species. 



