86 PROCEEDIlSrGS OF THE ISTATIONAL. MUSEUM vol.79 



are faintly brown or brown black, middle pair somewhat darker, 

 basal four-fifths of hind coxae black, the femora and tibiae brown 

 black, except base and apex narrowly, tarsi almost stramineous, 

 other parts of legs lemon yellow ; stigma dark brown ; peduncle and 

 most of abdomen black, or abdomen in part brownish black on the 

 sides. 



Head three-fifths to four-sevenths as long as broad, face protrud- 

 ing rather strongly beyond eyes, well-rounded and distinctly set oif 

 from eyes, vertex feebly convex above transversely, back edge of head 

 almost straight ; all of vertex finely and densely punctate, with sparse 

 small umbilicate punctures, malar space smooth, shiny, cheeks finely 

 strigose-punctate, scantily hairy, face reticulate-punctate, moderately 

 hairy; pedicel a fourth longer than Fl, latter slightly longer than 

 F2, F2 to F5 subequal in length, each only slightly longer than thick ; 

 mesothorax almost as broad as, and pronotum about one-sixth nar- 

 rower than, head ; pronotum and mesonotum coarsely punctate, punc- 

 tures umbilicate and almost contiguous, anterior half of mesopleura 

 finely and densely pitted, posterior half aciculate-punctate ; propodeal 

 surface rather coarsely and variously reticulate, groove broad, its bot- 

 tom rounded and rugose, the anterior fourth smooth, shiny, groove 

 limited anteriorly by a broadly V-shaped carina with rounded apex; 

 submarginal vein with about 16 setae ; abdomen polished and smooth, 

 and bare except moderately hairy along ovipositor sheath. 



Male. — Unknown. 



Type locality. — Glenn Dale, Md. 



Holotype.— Female, U.S.N.M. No. 20364. 



Originally described from the holotj^pe, and presumably also an- 

 other female from oak at Washington, D. C, which Mr, Girault had 

 at hand. The holotype was collected at large in a woods on June 26, 

 1916. Two additional females were sent me b}^ Dr. J. McDunnough 

 from the entomological collections of the Canadian Department of 

 Agriculture, Ottawa. These agree in every way with the tj^pe and 

 the Washington specimen, and issued June 3, 1911, from the galls of 

 N euToterus hatatus (Fitch). The galls were collected by H. G. Payne 

 at Bear River, Nova Scotia. This is the oak potato gall, and appears 

 on white oak {Querent alha). 



36. DECATOMA FLORmA Girault 



Decatoma ftorida GiRAtrLT, Descriptiones hymenopterorum chalcidoidicarum 

 variorum cum observationibus, pt. 5, p. 6, 1917 ; Proc. U. S. Nat. Mus., vol. 

 58, p. 208, 1920. 



Most like niarylandica Girault from which it may be distinguished 

 by characters given before the description of that species. 



Female. — Length 3 to 3.1 mm., fairly robust, body almost entirely 

 black ; head black except a narro sv ocular band of yellowish brown, an 



