ART. 28 CHALCID FLIES NORTH OF MEXICO— BALDUF 29 



willow gall, Rhabdophaga batatas {S. hatatus Walsh) and from "an 

 undescribed gall" on swamp white oak {Quercus hicolor) which, he 

 states, was " in all probability cynipidous." I have found no means 

 of determining what the oak gall inhabitant is. None of the original 

 specimens is at hand, and the Walsh description brings out no char- 

 acters that serve as a basis for separation. I am here regarding the 

 Decatoma from willow as having priority right to the name nubili- 

 stigvia^ and believe that the species from swamp white oak will prove 

 to be distinct from it when it is rediscovered. I have no nubill- 

 stigma-like material from the oak, hence it has probably not already 

 been described under another name. 



10. DECATOMA BICOLOR Ashmead 



Plate 1, Figure 8 



Decatoma hicolor Ashmead. Trans. Amer. Ent. Soc, vol. 9, p. xxxii, 1881. 



Similar to D. lanae Ashmead in having F2 to F4 of female as 

 broad as long, but distinguishable from it by its darker body and 

 legs, and the longer, broader, and almost rectangular form of the 

 submarginal band. 



Female. — Length 2.5 mm., mostly yellowish brown to dark or 

 reddish brown ; antennae medium brown, pedicel yellow, scape in- 

 termediate between flagellum and pedicel in color ; head, thorax, and 

 propodeum a mixture of yellow and brown and lightly infuscated 

 above, except pronotum is more nearly brown-yellow, and propo- 

 deal groove and area along anterior margin are black; all femora 

 and fore tibiae mostly reddish brown, hind tibiae mostly brownish 

 black, legs otherwise largely yellowish brown; submarginal band 

 dark brown, extending two-thirds across the wing and about two- 

 thirds as wide as long, proximal margin concave, irregular, distal 

 edge almost entire and broadly rounded and reaching, sometimes 

 strongly, beyond apex of stigmal vein, secondary band exceedingly 

 faint, practically lacking; abdomen deep reddish brov>n and 

 infuscated. 



Head from above robust, its length about four-sevenths of its 

 width, about as broad as mesothorax and slightly narrower than 

 prothorax, hind edge almost straight, eyes on almost the same con- 

 tour level as face, their margins not deeply depressed, head sur- 

 faces coarsely reticulate-punctate to strigose, intervals of reticula- 

 tions sparsely and finely roughened, vertex, chiefly around ocelli, 

 both umbilicately and finely punctate; antennae relatively thick, 

 broadening distinctly from pedicel to first segment of club, Fl 

 scarcely longer than broad, F2, F3, and F4 as long as broad, hairs 

 coarse and partly overlapping next joint; thorax umbilicately punc- 



