18 PEOCEEDINGS OF THE NATIONAL, MUSEUM. vol.63. 



longer than the rest, broadly transverse; wings slightly infuscated^ 

 extending half the length of the second tergite past the apex of the 

 abdomen. Black; legs and antennae brown, the flagellum, middle 

 and posterior femora, and tibiae, darker. 



Male. — Length 1.20 mm. Pedicel longer than wide, as wide as 

 joint three, a little shorter than four; joint three closely united to 

 four, transverse, not quite as wide as four; four somewhat longer than 

 wide, obliquely excised distally; six to nine a little longer than wide; 

 ten as wide as two, as long as three and four united; abdomen as wide 

 as the head, two-thirds as wide as long, a little longer than the thorax; 

 wings extending two-thirds the length of the second tergite past the 

 apex of the abdomen. 



Type locality. — Kirkwood, Missouri. 



Type.— Cat. No. 2273, U.S.N.M. Type and allotype selected. 



Redescribed from the type series, nine females and two males, in 

 the National Museum. They were reared by Miss Mary Murtfeldt 

 April 3, 1887, from a Cecidomyid gall on Coraus paniculata. 



5. TRICHACIS VIRGINIENSIS Ashmead, 



Trichacis virginiensis Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 297. 



Female. — Length 1 mm. Head more than twice as wide as long, 

 wider than the thorax, not emarginate behind; occiput smooth, shin- 

 ing, separated from the vertex by a sharp carina; cheeks subconvex, 

 unsculptured ; vertex shagreened laterally; frons smooth and shin- 

 ing; length of head above eyes not greater than length below; pedi- 

 cel twice as long as wide, longer and wider than joint three; three as 

 long and as wide as four; five narrower, as wide as long, equal to six; 

 seven to nine broadly transverse; ten as wide as nine, less than twice 

 as long as wide, blunt apically; thorax three-fourths as wide as 

 long, as wide as high, somewhat flattened above; otherwise entire 

 thorax as in cornicola but the scutellum without such distinct dorsal 

 and posterior faces; abdomen elliptical, twice as long as wide, dis- 

 tinctly longer than the head and thorax united ; second tergite as wide 

 as long, not sculptured and with short basal foveae not so distinctly 

 pubescent as in cornicola; tergites three to six united nearly as long 

 as the second; four and five equally long, a little longer than three, 

 like the third very finely punctate; six as long as three and four 

 united, polished, triangular, as long as wide, sharply pointed distally; 

 wings brown, reaching a little beyond the apex of the abdomen. 

 Black; antenna, except club, tibiae and tarsi (except last joint of each) 

 and trochanters, yellow; club and parts of legs not mentioned brown- 

 ish or piceous. 



Type locality. — Arlington, Virginia. 



Type.— Cat. No. 25429, U.S.N.M. 



Redescribed from the type specimen. 



