82 H. F. BASSETT.. 



closely resemble pepper corns. The diameter of fresh galls is about 

 three-sixteenths, while the dry ones are about one-eighth of an inch. 

 They contain no true larval cell, separable from the gall walls, which 

 are thin and of a loose texture. They are monothalamous, and the 

 insects were nearly mature in October when they were gathered and 

 came out before the next spring. Their coming out was probably 

 hastened by the warmth of the room in Avhich they were kept. I 

 found them in northern Ohio in 1885 ; they seem to be extremely 

 rare, I having found them on one occasion only and then only seven 

 or eight individuals. From these I reared three female gall-flies, 

 which are described as follows: 



Gall-flies. — Head dull brownish black, the brownish hue only discernible in 

 a strong light, and most apparent on the face and cheeks; a few scattered haii'S 

 on the vertex; antennie dusky brownish black, slender, thirteen jointed, second 

 joint short, globose, the third one-fourth longer than the first and second taken 

 together, and the fourth equaling them in length, remaining ones nearly equal, 

 and the terminal so closely joined that counting them is a difficult matter. 

 Thorax Uavk, somewhat hairy, but not evenly so; parapsidal grooves distinct 

 towards the scutellum, but disappearing before reaching the collare; the two 

 parallel lines on the anterior half of the mesonotum extremely faint, but smooth 

 and shining; scutellum hoary, with suberect yellowish hairs, foveas indistinct. 

 Abdomen black, first segment short, second long, rather densely hairy on the 

 sides; anteriorly the abdomen is compressed, truncate posteriorly and concealing 

 almost wholly the remaining segments; ovipositor exserted, the sheath hairy at 

 the tip. Legs brownish red ; ungues two-toothed. Wings with a faint smoky 

 tinge, large; veins distinct, but not heavy, brownish red; areolet medium size, 

 the veins bounding it, except the second transverse, very slender; cubitus not 

 quite reaching the first transverse, radial area open, rather narrow. Length : 

 body, .12 inch.; wings, .12 inch.; antennae, .11 inch. 



4. A. llowertoni n. sp. 



Galls. — Woody, club-like enlargements of the tips of the twigs 

 one of the New Mexican oaks, species uncertain. They bear some 

 resemblance to the galls of A. clavida Bass, and A. similis Bass. 

 When green they are covered with leaves even more completely than 

 the first named well-known species, and these and their large stipules 

 still adhere to the dried galls. They are nionothalamous, the en- 

 closed larval chamber is not free, and is placed near the base of the 

 gall and immediately above it is a much larger, irregular open space, 

 through which the insect passes in leaving the gall. The galls are 

 rather irregular in shape, but when green are probably about three- 

 fourths by one-half inch in diameter. In some specimens the gall 

 does not wholly retard the axis of growth, and short, leafy stems 

 project out of it. 



