A. A. GIRAULT. 35 



Posterior wings moderate in width, usual in shape, its 

 blade with three longitudinal, nearly complete and equal rows 

 of discal cilia (including the usual row along each margin, 

 here somewhat away from the margins); marginal cilia of 

 posterior wings normal, short along the cephalic margin, 

 moderately long along the caudal margin where they exceed 

 the width of the wing blade in length ; posterior wings hya- 

 line ; blades widest at their bases. 



Mandibles tridentate, the two outer, lateral teeth distinct 

 and subequal, acute, moderately strong. 



Male. — The same ; abdomen slightly longer, its sides more 

 parallel ; antennae with whorls of long hairs as in Pentarihron 

 Riley but 7-jointed, the joints distinct yet the club not well 

 dilTerentiated from the funicle as in the female, all the joints 

 subquadrate, the terminal joint with an apical bud-like ap- 

 pendage. 



Type. — T?'2chog7-amma nigrum Ashmead. 



A genus mostly distinguished by the 7-jointed antennae 

 with a ring-joint and with a large funicle joint having a pecu- 

 liar twisted appearance, by dissimilar male antennae, by the 

 characteristic fore wings and by the short, straight, uniform 

 marginal vein. It is closely related to Chaetostricha Hali- 

 day as known to me through {Paracentrobia) Chaetostricha 

 flavipes (Girault) but the fore wings of the latter differ re- 

 markably in the shape of the marginal and stigmal veins 

 which are short, strongly clavate and nearly at right angles 

 to each other and the male antennae do not differ from those 

 of the female. 



1. Ufeiis nig-er (Ashmead). 



Trichogranima nigrum Ashmead, 1888, p. 107. — de Dalla Torre, 

 1898, p. 3.— Schmiedeknecht, 1909, p. 485. 



The type species of this genus was described years ago 

 by Ashmead (1888) as follows: 



" (20) Tricliograiiinia iiigrimi. 



Female. Length .02 inch. Robust, black, polished. Antennte short, 

 stout, brown. Legs entirely white. The scutellum is rather high testa- 

 ceous, the extreme tip white. The abdomen is sessile ovate, not longer 

 than the head and thorax, its dorsum somewhat flat. Wings hyaline, 



TRANS. AM. KNT. SOC, XXXVII. 



