ENTOMOLOGICAL SECTION. XXV 



As my species presents characters widely diiFerent from any cynipidous 

 genera known, I propose to erect a new genus for its reception. Like 

 Biorrhiza niger, it secretes, when handled, a strong waspy odor. 



DRYORHIZOXENUS n. g. 



Form slender ; maxillary palpi ^-jointed, labial palpi '^-jointed, the third joint 

 globular ; mandibles tridentate, outer two teeth acute, inner one obtuse ; areolet 

 closed, radial area open, radial vein regularly curving upwards and thickening 

 at tip. 



9 . — Antennse 14-jointed, filiform, pubescent, first joint stout, attached to the 

 head by a short peduncle, second small, moniliform, third longest, slightly curved 

 and excised, thickest at tip, the following subequal in length, uniform in thick- 

 ness, terminal joint longer than penultimate, all the joints from the fourth have 

 a narrow bead-like annulus at tip, quite noticeable in living, almost obsolete in dry 

 specimens. Abdomen globose, smooth and shining, with a very short peduncle, 

 second segment occupying half the portion of the surface ; ovipositor exserted 

 slightly beyond tip of abdomen; ventral valve well developed and projecting 

 considerably, tip of abdomen deeply emarginate ; tibise somewhat flattened, armed 

 with two large curved spines (which are evidently used in digging), and densely 

 and strongly hirsute; pleurte smooth and shining, parapsidal grooves distinct; 

 scutellum of moderate size, longer than wide, rugoso-punctate, depressed and 

 bifoveolate at base, contracted in middle and elevated posteriorly, with the hinder 

 margin round. 



%. — Antennse 15-jointed, filiform, second joint small, slightly elongated, third 

 longer than in 9 > excised, each joint widening and truncate at tip and without 

 the bead-like annulus. Abdomen long-ovate, attached by a short peduncle, front 

 tibipe frequently unarmed ; otherwise as J • 



l>ryorIiizoxeniis floridaniis n. sp. 



Galls. — Clusters of irregular somewhat wedge-shaped, soft, fleshy 

 galls, of the consistency of a potato, surrounding the rootlets of Quercus 

 vlrens^ brittle and easily detached, varying in length from one-half to 

 three-fourths of an inch ; externally rough, irregular, and of a yellowish 

 color ; internally composed of numerous cells one above another, and 

 separated by thick fleshy partitions. 



Gall-Fly. — 9- — Length .20 inch. Slender; bright shining brownish-yellow; 

 head finely punctate, eyes, tips of mandibles and ocelli black; antennte brown, 

 basal joint paler; thorax convex, smooth and shining, two deep longitudinal 

 grooves converging towards scutellum, which is coarsely rugoso-punctate and 

 slightly pubescent, posterior margin dark brown; abdomen smooth and shining; 

 legs brownish-yellow, densely hirsute; wings hyaline, areolet closed, petiolate, 

 radial area open, all the veins dark brown and bordered with brown, the brown 

 border widening at tip of subcostal and radial veins, the blotch not quite reaching 

 outer edge, the anal vein rather straight and thick, broken opposite middle of 

 areolet, the brown border surrounding the broken part and extending along to 

 near the tip of the vein. 



% . — Length .18 inch. Head finely punctate, a slight depression extending 

 from outer ocelli over to eyes ; mandibles reddish-brown ; palpi paler, a few 

 microscopical hairs on face; antennae 15-jointed, entirely brown-black : tibiffi and 



