358 [May 



37. C. VENTRICOSA Bassett. Proc, etc., Ill, p. 681. ( 9 . Q. llici- 



/otlu.) 



38. C. cornigera 0. S. I have described the gall, which I observed 

 in considerable number on Q. palustris (Proc, etc., I, p. 251). Since 

 then, I have obtained the gall-fly, and let its description follow. Whe- 

 ther the gall observed by Mr. Bassett on Q. Uicifolia (Proc. II, 328 ) 

 belongs to the same species is very uncertain. I have not seen it. 



C. cornigera n. sp. 9 • 0. 11 long. Black; the head comparatively broad, as 

 broad as the thorax; face finely and indistinctly pubescent: irregularly rugose, 

 semi-opaque : a few indistinct striae converging towards the mouth on both sides : 

 mandibles reddish, their tips black: palpi brownish-yellow: front opaque, ver- 

 tex with some more lustre, finely, irregularly sculptured; antennae 1-t-jointed, 

 yellowish-brown, brown towards the tip: third joint nearly as long as the 

 two preceding taken together : the following joints gradually diminish in 

 length ; joints 8 to 13 differ but little in length; the last joint is about once and 

 ahalf the length of the preceding. Humeral parts of the collare coarsely rugose, 

 opaque, in contrast to the comparatively smooth and shining mesonotum ; the 

 latter with delicate, dense transverse microscopic rugae, not much diminishing 

 the lustre of the surface ; three moderately distinct impressed lines run from 

 the collare some distance backwards; parapsidal grooves very distinctly mark- 

 ed, but their margins are less well cut or less smooth than usual, as if the groove 

 was formed by a series of confluent punctures; the lateral grooves partake of 

 the same character, and are somewhat curved, with the convexity on the out- 

 side ; tegulae yellowish-brown: pleurae densely and irregularly sculptured, 

 opaque, except a shining spot on their upper portion: scutellum deeply and 

 coarsely rugose; abdomen black, or rather dark-brown, polished, the margins 

 of the segments lighter brown : second segment comparatively large : ventral 

 valve ending in a short apieule, bearing a tuft of hairs; feet brownish-yellow, 

 tips of tarsi brown ; hind femora and tibiae infuscated : middle femora some- 

 times also. Wings hyaline, somewhat whitish, stout veins pale-brownish : areo- 

 let distinct. 



I possess only two specimens, bred from the gall ; one of them is 

 certainly a female ; the abdomen of the other is somewhat injured, and 

 as, at the same time the 14th antennal joint shows an indistinct sub- 

 division in two, it is not impossible that this is a male. 



39. C. punctata Bassett, Proc. etc. II, p. 324. ( 9; Q. rubra.) 

 10. C. podagra Walsh. Proc. etc. II, p. 492. ( 9 ; Q. tinctoria.) 

 About these species probably being merely phytoghapic varieties, com- 

 pare Walsh, 1. c. in the foot-note. Although more than 120 specimens 

 were reared by both authors, no male has yet been found.* 



41. C. scttula Bassett, Proc. etc. Ill, p. 683. (S }. Q. tinctoria.) 

 The difference in the size notwithstanding, there is a striking analogy 

 in shape and sculpture between this species and the former. I have 



* I have found nearly 600 specimens — all females. — H. F. Bassett. 



