70 H. F. BASSETT. 



They are polythalamous, and there are no ti"ue larval cells that I can 

 discover. The species of oak on which they grew, for it was un- 

 doubtedly an oak, is not known. But. while a good description of 

 the galls is impossible from the material I have in hand ; the insects 

 possess very marked specific characters. I have forty-seven speci- 

 mens of this species, and, strange to say, they are all males ! They 

 are described as follows : 



Gall-flies. — Head yellowish brown to dark yellowish brown ; vertex is some- 

 what rngose, ocelli very pale yellow; antennte somewliat darker than the head, 

 15-joiiited, the first and second of moderate length, the third very long, slightly 

 curved and incised, the remaining joints long and all very slender; the cheeks 

 are grooved ; the thorax, and, indeed, tlie whole body, shining yellowish 

 brown, but varying considerably in intensity in different parts and also in the 

 same parts in different specimens. Thorax narrow and elevated in the middle, 

 and with deep parapsidal grooves that converge towards the scutellum ; pleurte 

 darker than the mesonotnm and less shining; scutellum finely rugose, opaque, 

 fovese small, smooth, shining and widely separated. Legs reddish rather than 

 yellowish brown, and nearly uniforn in color. Abdomen: first segment very 

 long, slender and arcuate, like the first segment in most of the petiolated Bra- 

 conidfe ; second segment very small, triangular, the acute angle joined to the 

 first segment, compressed laterally, and, small as it is. almost or quite covering 

 the remaining segments ; it is smooth and shining, and in some specimens the 

 dorsal portion is indented, though this may be accidental. Wings very large, 

 hyaline, the veins not heavy and rather pale; areolet small, but distinct, the 

 second transverse vein bent in the base of the radial area, but without the stumj) 

 of a vein ; radial area open, long, but of medium width ; cubitus very slender 

 and nearly colorless. Length: body, .12 inch.; abdomen, .05 inch.; wings .20 

 inch.: antennse, .20 inch. 



The pale ocelli, the extremely long antennse, the large wings, the 

 long pedicel, and the extremely small remaining segments of the 

 abdomen, all these taken together mark this as a very distinct spe- 

 cies that, when its history is better known, may form the type of a 

 new genus. 



3. D. ebtirnens n. sp. 



Galls round, smooth, polished, resend:)liug old ivory. They are 

 from one-eighth to three-sixteenths of an inch in diameter, growing 

 in great numbers on both the upper and under surface of oak leaves 

 of a species I have not yet determined. The galls were .sent me by 

 A. H. 8iler from southern Utah. Sometimes the galls are so crowded 

 that they lose their globular form. They are strongly attached to 

 the leaves and the base of the gall is usually grooved by the vein on 

 which it grows. There are often twenty or thirty galls on a single 

 leaf, one-third of which will be on the underside. They are hard 



