76 H. F. BASSETT. 



light yellowisb brown, slightly darker in the niidtlle of the very large second 

 segment, others narrow. Legs dark brownish red. ungues simple. Wings large, 

 hyaline : veins slender, yellowish brown ; areolet not large, but distinct; cubitus 

 fading out close to the first transverse, but not touching it; second transverse 

 bent, but not angulated at the base of the broad, open radial area. Length : 

 body, .13 inch. ; wings, .16 inch. ; antennae, .13 inch. 



5. A. (Callirhytis) sac«*ularius n. sp. 



Small, heniisplierical, pouch-like galls, attached by their full di- 

 ameter to the underside of the leaves of Q. coccinea, the largest not 

 more than three-sixteenths of an inch through. An ordinary ring 

 net for catching insects will give a good idea of the form of this gall 

 as seen on the underside of the leaf. The flat upper surface is formed 

 of the upper lamina of the leaf and is sometimes slightly depressed 

 below and rarely raised above the general surface of the leaf It 

 appears on this side as a circular scar whose outline equals the di- 

 ameter of the gall. The gall w'alls are green like the leaf, and ex- 

 tremely thin, and in each there is a free, oval larval cell like that of 

 A. pimdatoides described in this paper, except that it is a short oval, 

 while the other is very long. I was inclined to consider these two as 

 identical, but an examination of the only fly, a male, that I have 

 reared from these galls ; their shaj)e, and the larval cell, and the 

 position of the galls on the leaves show it to be a distinct species. 

 I have a number of the galls, and each contains the empty larval 

 cell, showing that my specimens were gathered too late. 



Gall-flies. — Head black, vertex rugose, face hairy with white hairs; antennie 

 longer than the body, fifteen joints, color reddish brown at the base to dusky 

 brown at the tip, first short, cup-shaped, second very short, globular, third twice 

 as long as the first and second, fourth and remaining ones one-half as long as the 

 third. Thorax black, mesothorax coarsely and unevenly wrinkled, two closely 

 contiguous parallel lines reach nearly half way to the scutellum, parapsidal 

 grooves entire, but rather obscure anteriorly; lines over the base of the wings 

 distinct, and anteriorly nearly uniting with the parapsidal grooves; scutellum 

 very roughly wrinkled, small ; fovese small. Abdomen small, shining black. 

 Legs: posterior pair dark reddish brown, lighter at the joints; anterior pairs 

 lighter, ungues simple. Wings medium size, slightly fuscous, veins dark smoky 

 brown, all uniformly colored, areolet very small, but very distinct; cubitus 

 slender towards the first transverse, but touching it; radial area open and rather 

 broad. Length : body, .10 inch. ; wings, .11 inch. ; antennge, .13 inch. 



One male specimen from Connecticut. 



6. A. (Callirliytis) seiiiiiiosus n. sp. 



Galls. — Hard, woody knots, sometimes terminating the shoots in 

 a clump of oak sprouts (Q. castanea?), hut oftcner an enlargement 

 of the base of the small lateral branches. In my specimens the ter- 



