302 R. OSTEN SACKEN. 



is a little over half an inch long, sometimes much smaller; on the in- 

 side there is a comparatively large hollow space, containing the pupa. 

 Some of the galls were nearly sessile on the central stalk of the plant; 

 in other cases, the branch had grown an inch or two before being de- 

 formed by the gall. In some cases from four to six galls occupied the 

 end of the stalk. The flies after escaping leave a whitish, transparent 

 pupa-case inside of the gall. I found these galls quite frequently near 

 New London Conn., and in the environs of Brooklyn, L. I. As sev- 

 eral of the specimens collected by me produced flies about the middle 

 of September and as T. 2)olita, if I remember right, is frequently found 

 in the spring and in summer, the question remains to be solved whether 

 the flies hybernate, or whether some of them remain quiescent within 

 the pupa until the next season ? 



Cecidomyia antiiophila n. sp. 



Among the racemes of SoJidago I observed (in September 1867, 

 near Brooklyn, L. I.) that some of the flowerlets were deformed into a 

 gall, somewhat analogous to that of Ccvid. racemirola 0. S. {JiJono- 

 graj>Ii>i, Vol. 1, p. 196), on account of the mode of its occurrence, but 

 different in structure. The new gall is elongated-conical, blunt at the 

 end, about 0.25 — 0.3 of an inch long; the basis about 0.1 broad; the 

 surface is pale green, covered with a white down ; the inside of the gall 

 is hollow, divided in two compartments by a delicate, somewhat fun- 

 nel-shaped membrane, placed about the middle of the cavity, point up- 

 wards. At the bottom of the lower compartment, that is, at the lower 

 and broader end of the gall, the small, whitish larva may be found; it 

 shows no sign of a breast-bone, except two, exceedingly minute black 

 dots, visible only under a very strong lens. Towards the end of Sep- 

 tember, numerous Ceci(Inm,//nxi were obtained from these galls. Un- 

 fortunately, 1 have preserved only a few specimens, all males. Thus 

 I am unable to state, whether the antennal joints in the female are pe- 

 dicelled, as in the male, or sessile. The structure of the antennae ren- 

 ders it apparent that this species belongs to the genus Cecidomyia, in 

 the narrower sense, and not to Diplosis. 



Cecidomyia anthophila n, sp. % . — The pale brown antennae count 2 -(- 19 

 joints ;■•■■■ those of the Hagellum are nearly as long as their pedicels ; the length of 

 each joint is nearly double of its breadth ; the shape of the single joints is some- 

 what square (otherwise the flagellum is not unlike Tab. I, f. 5 of Monographs, etc. 

 Vol. I). Thorax pale brown, shining above; a spot on the humeri is pale yel- 

 lowish; stripes hardly indicated by rows of hairs; pleurae brownish in front, 



«It must be borne in mind that the number of joints of the flagellum in Ce- 

 cidomyia sensu str. is often not quite constant in the same species. 



