166 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



and one-half times as long as thick; face below with prominent striae 

 converging toward the clypeus; upper part of face, vertex, temples 

 and occiput with very fine reticulate-punctate sculpture; thorax 

 sculptured like the head, only more distinctly; propodeum with a 

 well defined median carina and sculptured like the scutellum, only 

 somewhat less distinctly; wings hyaline, the postmarginal vein absent, 

 marginal vein of the hind wing ending in a small rounded knob; 

 abdomen shorter than the head and thorax, ovate, mostly smooth but 

 with the apical segments faintly reticulate above, petiole short. 

 General color pale yellow, tinged with greenish on the dorsum and 

 spotted with black as follows : A spot on the occiput, median lobe of 

 the mesoscutum except lateral margins and apex, basal spot on each 

 scapula, basal spot on each axilla, propodeum basally, spot on the 

 mesosternum, abdominal petiole, and dorsal tergites 2, 3, and 4 for the 

 most part. A blotch medially on the scutellum and most of the pro- 

 podeum usually brownish. 



Male. — Funicle appearing 5-jointed, the club 2-jointed; first 

 funicle joint about one and one-half times as long as thick; following 

 joints subequal and nearly three times as long as thick; abdomen 

 spatulate and mostly black, the extreme apex yellow. The funicle is 

 really but 3-jointed, the first ring-joint being greatly elongate and 

 the basal joint of the club resembling the funicle joints. 



Type-locality. — Brownsville, Texas. 



Type.— Cat. No. 18337, U.S.N.M. 



Twenty specimens reared by E. G. Smyth from galls on Mimosa 

 and recorded under Webster No. 6480, Bureau of Entomology. 



Genus TETRASTICHUS Haliday. 



According to Kourdumoff, typical species of Tetrastichus have only 

 a single stiff bristle on the upper side of the submarginal vein. Those 

 having more than one such bristle he places in the genus Geniocerus. 

 In Geniocerus as thus constituted will fall species having two, three, 

 four, Rye, six, or even a greater number of such bristles and which 

 otherwise can scarcely be separated from species having but one 

 bristle. The writer can furnish no evidence that the number of these 

 bristles varies within any given species, but it is evident that the 

 division is by no means a natural one. Acceptance of Geniocerus as a 

 good genus would necessitate changing the generic name of the major- 

 ity of the American species, which under the circumstances does not 

 seem advisable. It is the intention of the writer, therefore, to treat 

 Geniocerus as a synonym of Tetrastichus, at least until some more 

 satisfactory character can be found to separate them. The presence 

 of but one bristle in some of the species does afford a convenient 

 means of separating the species of Tetrastichus into two groups and is 

 therefore welcome. 



