ART. 15". REVISION OF SUBFAMILY PLATYGASTERINAE FOUTS. 17 



elliptical, as wide as the head, two-thirds as wide as long, as long as the 

 head and thorax united ; first tergite twice as wide as long, thickly pu- 

 bescent laterally, with the median area longer than wide ; second tergite 

 as wide as long, smooth, the foveae unsculptured, pubescent basally, 

 tergites three to six very finely shagreened or covered with wavy 

 reticulations, united a little over half as long as the second, the last 

 four segments becoming gradually shorter toward the apex; sixth 

 tergite as long as the fifth, much wider than long; wings slightly 

 infuscated, reaching a little beyond the apex of the abdomen. Black ; 

 legs bright brownish-yellow; antennae and coxae dark brown. 



Type, locality. — Fort Huachuca, Arizona. 



Tyyc.—CsiXi. No. 2270, U.S.N.M. 



Redcscribod from the type specimen in the United States 

 National Museum. The type was reared May 8, 1883, from a Cecido- 

 myid gall on an unknown plant, sent to the Department of Agriculture 

 by H. K. Morrison. 



4. TRICHACIS CORNICOLA ^Ashmead). 



Synopeas cornicola Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 288. 

 Female. — Length 1.20 mm. Head more than twdce as wide as 

 long, emarginate behind, wider than the thorax; occiput aciculate, 

 separated from the vertex by a carina; cheeks shagreened, convex; 

 length of head above eyes greater than its length below them; frons 

 polished, wider than the greatest diameter of the eyes; pedicel and 

 the four joints following it subequal in width, the pedicel the longest, 

 twace as long as wide; joint three longer than wade, shorter than 

 four, w^hich is one and one-half times as long as wide; five shorter 

 than three, hardly longer than wide; six as long as four; joints seven 

 to nine wider than long; ten as long as two, conical, blunt apically; 

 thorax three-fourths as wdde as long, convex above, higher than wide; 

 pronotum mostly smooth and shining, narrowdy shagreened medially 

 on the sides; mesonotum finely shagreened anteriorly, along its 

 posterior margin densely covered with long golden hairs wdiich extend 

 over the scutellar fovea; notauli distinct on basal two-thirds of 

 mesonotum; median lobe broadly truncate posteriorly; scutellum 

 flattened above and with the dorsal face sharply distinguished from 

 the posterior; on the transverse ridge is a small, dense tuft of w^hite 

 hairs; scutellum highl}^ margined laterally, sparsely covered with 

 long golden hairs; abdomen broadly elliptical, as long as the head 

 and thorax united, as wide as the head, two-thirds as wide as long; 

 first tergite evenly rounded above, the median area not very dis- 

 tinctly indicated, longer than wdde; second tergite a Httle longer 

 than wide, not sculptured; foveae short and deep, pubescent basally; 

 tergites three to six shining, with an indistinct sculpture, subequal 

 in length, united not quite one-half as long as the second; six a little 



