58 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.79 



Fl equal in length, F2 to F4 one-half longer than thick, club com- 

 pact and almost as long as F4, F3, and F2 together; submarginal 

 vein with 11 setae; abdomen entirely polished above, venter in part 

 coriaceous. 



Type locality. — Austin, Tex. 



Jy^e.— Female, U.S.N.M. No. 42242. 



Remarks. — The type and one male and seven female paratypes 

 were reared by Dr. J. T. Patterson from the galls of Andricus 

 irmrtfeldtae Ashmead on Quercus hreviloba at the type locality. 

 The material was sent me by Doctor Kinsey. L. H. Weld reared 

 a female from the gall of Callirhytis flavipes (Gillette) on Q. macro- 

 carpa at Moline, 111. 



The single male at hand exhibits an unusual degree of color 

 variance from that of the female. The sculpture of the vertex and 

 the dimensions of the head also depart strikingly from the condi- 

 tion in the other sex. It may be that further rearings will show 

 these differences of the male to be abnormal. 



22. DECATOMA OCCmENTALIS, new species 



Plate 2, Figuees 19, 20 



Similar to nigriceps Walsh in color, but distinctly larger, head 

 usually shorter and wider, submarginal band usually longer and 

 less variable in length, often almost twice as long as wide ; abdomi- 

 nal segments more extensively coriaceous than in nigriceps. 



Female. — ^Length, 2.5 to 3.5 mm., almost entirely black; head 

 black, mandibles brown, sometimes a faint pcular band either in 

 front of or behind eye, or both, and rarely a fine line on lateral edges 

 of antennal scrobe, brownish yellow; scape yellow, pedicel brown, 

 but yellow at apex and somewhat more extensively so beneath, ring 

 joint yellow, flagellum uniformly chestnut-brown; pronotum black, 

 except a yellowish brown patch on anterior lateral corners, which 

 extends more or less mesad on anterior surface and caudad on lat- 

 eral surface but not beyond middle; rest of thorax and propodeum 

 wholly black; rest of legs brownish black, except trochanters, which 

 are partly yellowish brown, apical half of front femora, most of 

 front tibiae, especially their bases and apices broadly, and these parts 

 of the other femora and tibiae, yellowish brown, tarsi stramineous- 

 yellow ; stigma dark brown, submarginal band medium brown, length 

 varying from one-half longer than wide to twice as long as wide, 

 but somewhat shorter than wide to one-half longer than wide on 

 the specimens from Arizona and New Mexico, and entirely lacking 

 on one male and one female from Arizona, width of band not greater 

 than length of stigma, scarcely touching stigmal vein, distal margin 

 convex, and obtusely angulate just beyond stigmal vein, proximal 



