H. F. BASSETT. 311 



Mr. W. H. Ashmead kindly determimed the generic place of 

 this species. Named for Mr. Leavenworth, to whom I am indebted 

 for the species. 



Amlricus (Callsirliylis) tuherosa n. sp. 



Galls. — Woody, polythalamous, growing on Q. ilicifolia and 

 reaching maturity in June. They are the young shoots of this oak, 

 checked in their terminal growth, by the sting of the insect. They 

 resemble the galls of A. scitulus B., but more closely those of A. 

 tectus B. The largest are not more than f of an inch in length 

 and \ in diameter. They are quite rare. 



Gall-fly. Male. — Black. Antennas fifteen jointed, first and second joints 

 thick, ovate, first dark brown at the base, lighter above; second and the six or 

 seven following yellowish brown, remaining joints dusky, the third joint is 

 curved but not incised. Head punctate. Thorax obscurely wrinkled as seen 

 under a strong magnifier. Pleurae beautifully striate. Parapsides fine and very 

 distinct. Scutellum finely rugose ; fovse small. Abdomen small, briefly petio- 

 late. Legs brownish yellow. Wings hyaline, and with a microscopic pubes- 

 cence. Veins pale, areolet distinct; cubitus slender, and reaching to the first 

 transverse vein. Radial area open, broad. Body, .06; antennae, .06; wings, .09. 



Female. — Antennae thirteen jointed, first and second globular, all pale brown, 

 towards the apex becoming somewhat dusky brown, all the joints are very short. 

 Head, thorax and scutellum as in the male. Legs paler brown and more uni- 

 form in color than those of the male. Abdomen briefly petiolate ; second seg- 

 ment large. Wings as in the male but shorter. Body .07, antenna; .05, wings .08. 



Waterbury, Conn. Not abundant. 

 Amlricus priiiuosus n. sp. 



Galls. — .12 to .15 of an inch in diameter, perfectly round and 

 variously situated on the leaves, and occasionally on the sterile 

 aments of Q. obtusiloba. Outside they are densely pruinose, and 

 the walls are very thin. There is no larval cell. In many instan- 

 ces the blade of the leaf, or the part affected by the gall, is reduced 

 to a mere rudiment of irregular form and varying size, but in such 

 cases the gall is always banded by a minute ridge answering to the 

 leaf blade. It bears a rather close resemblance to A. utricula B. 



Gall-fly. Female. — Shining black. Antennae, thirteen jointed, first and second 

 very minute and light brown, all the following gradually shorter to the apex 

 which is dusky brown. In a few specimens there is a faint suture in the thir- 

 teenth joint. Thorax narrow or subcompressed, finely punctate and with a few 

 scattered hairs. The two median lines and the parapsides all even and distinct. 

 Scutellum microscopically wrinkled ; fovae small, deep and shining. Abdomen 

 large ; second segment very long, almost tubiform and covering all the others in 

 the dry specimens. Legs dark translucent brown but paler at the joints and 

 tarsi. Wings subhyaline. Veins not heavy but distinct in the basal portion of 



TRANS. AM. ENT. SOC, XXVI. JULY 1900. 



