54 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



long and thick, each one-fourth longer than broad, these dimensions 

 slightly various on different specimens, club only a little longer than 

 F4 and F5 combined ; nota of prothorax and mesothorax umbilicately 

 punctured, but more densely and not so coarsely as in many species 

 of the genus, both the front and hind halves of lateral surfaces of 

 mesopleura aciculate, posterior half more plainly so but with fewer 

 minute punctures; propodeum variously and coarsely rugose- 

 reticulate, groove deep with its basin rounded and limited in front 

 by a V-shaped carina, its apex obtuse and feebly rounded, groove 

 crossed by several low rugae; submarginal vein with a row of 15 to 

 19 setae, rarely 19, usually 15 to 17; abdomen smooth, polished, 

 unsculptured laterad, rarely feebly granulose on parts of posterior 

 half, hairy and punctate around sheath of ovipositor. 



Mcde. — Length 3.5 mm., somewhat less robust and darker than 

 female; color of head and antennae as in female; lateral areas of 

 pronotum each with an elongate black patch, metapleura, sides of 

 propodeum mostly, and hind coxae with middle of outer faces and 

 peduncle entirely, black; wing band reduced in length, only two- 

 fifths as long as in female, dorsal half of abdomen solidly brown 

 black; dimensions of head, its sculpture as well as that of meso- 

 pleura and propodeum, and vestiture of wings, as described for 

 female; Fl twice as long as broad, and a sixth longer and slightly 

 broader than pedicel, and a sixth longer than each of F2 to F4, 

 each of latter three-fifths as broad as long, their length uniform, 

 club as long as F3 and F4 combined. 



Type locality. — Oracle, Ariz. 



J'y;?^.— Female, U.S.N.M. No. 42239. 



The type, the allotype, and 14 female paratypes are in the col- 

 lection of the United States National Museum, and I have 5 female 

 paratypes in my own collection. This species is described and 

 known from this series of 20 females and 1 male (Hopk. U. S. 

 15639"^) reared by L. H. Weld on September 28, 1922, at Oracle, 

 Ariz., from the galls of Plagiotrochus {Andrlcus) coxii (Bassett) 

 (determined Weld), on Quercus emoryi. 



Remarks. — Its size, form of the head, color of the body and legs, 

 and shape of the submarginal band combine to make this one of 

 the most distinct species in the genus. It is probable that some 

 variation from the color of the lot at hand will be found in series 

 discovered in the future. Though it approaches -flanvniinneiventris 

 Girault most nearly in color and size, it is far removed from that 

 species in habit. It approximates duhia Walsh in size, in the form 

 of the head, and the dimensions of the wing band, and agrees 

 with it in vestiture of the submarginal vein, but the color differen- 

 tiates it sharply from that species. 



