420 BUI-LETIN 45, UNITED STATES NATIONAL MUSEUM. 



fifth stouter, the joints beyond to the last oval -moniliform, the last 

 cone-shaped. The scntellum has a single large fovea at base, thti bot- 

 tom with some raised lines; the median carina distinct only at the tip 

 of the scutellum. Coxie piceous-black, the legs nifoiis. Tegulai black. 

 Wings subhy3,line, with a fuscous pubescence. The third abdominal 

 segment is very little longer than the fourth, the fifth and sixth about 

 eq^lal, and longer than the third and fourth together. 



Habitat. — Ottawa, Canada. \ 



Types in Coll. Ashmead. 



Described from two 9 specimens received from Mr. W. Hague Har- 

 rington. 



' Tropidopiia tetraplasta, Hp. nov. 



9 . Length, not quite 2"'"" Polished, black ; cheeks bare ; collar, met- 

 apleura and petiole woolly ; dorsum of metathorax bare, smooth, with 

 a median carina; mandibles piceous; antenna;, except the club, and 

 the legs, including coxa', pale brownish-yellow. Antennae 12-jointed, 

 terminating in a 4-jointed club; the pedicel is much stouter, but not 

 quite as long as the first flagellar joint ; the first, second, and third 

 flagellar joints equal, the three following a little shorter and thicker, the 

 club rather abrupt, the last joint the largest, oval, but scarcely longer 

 than the penultimate. Scutellum with a large fovea at base, its bot- 

 tom with about 5 raised lines; dorsum of scutellum carinated, but the 

 carinae not extending into the fovea. Wings large, ciliated, the mar- 

 ginal vein triangular, pale brown. Abdomen pointed-ovate, scarcely 

 longer than the head and thorax together, the petiole short, not longer 

 than thick, woolly, the apex pointed, pilose. 



Habitat. — Washington, D. C. . 



Type in Coll. Ashmead. 



Described from a single specimen taken in October. It comes nearest 

 to T. Himnlans, but the antennjB are quite different, Laving a distinct 

 4-joiuted club, and the color of antenna) and legs are pale yellowish. 



DIAPRIA Latreille 



Pr^c, p. 110 (1796); Forater, Hym. Stud., ii, p. 123 (1856). 

 F^lua Pauz. 



(Type D. clegana Jut.) 



Head rounded or subglobose, without a frontal sulcus, the occiput 

 rounded. Ocelli 3, small, placed anteriorly. Eyes rounded. Antennae 

 on a frontal prominence, in $ 12-jointed, clavate, or gradually incras- 

 sated toward tips, sometimes the last three or four joints much en- 

 larged; the scape extends beyond the ocelli; the pedicel is usually 

 longer and stouter than the first fuuiclar joint ; in S 14-joiuted, nodose- 

 pedicellate, with whorls of long hairs, the first funiclar joint longer 

 than the second, the second curved or dilated toward one side, 



Maxillary palpi rather short, 0-joiuted. 



Mmidibie^ bifid at ti{>s. 



