(^24 [December 



rufous, dorsally covered with brown hairs, laterally and ventrally with short 

 white hairs, the ventral hairs apjDressed : sometimes the brown hairs cover the 

 entire dorsal surface, sometimes there are only 2 or 3 of the basal joints dorsally 

 covered with brown hairs on their medial i, sometimes the basal joint is en- 

 tirely covered with brown hairs and the 2 or 3 next only medially covered, 

 each succeedinc; joint for a shorter space, so as to show a wider luteous or rufous 

 band on each succeeding joint. Abdomen 9 with the dorsum sanguineous, rarely 

 dark umber brown: sometimes with the entire dorsal surface covered by short, 

 brown hairs, except the hind edge of each joint, which is covered with cinere- 

 ous hairs, and the sutures, which are glabrous and dark umber brown: some- 

 times covered dorsally with brown hairs, except the sutures, which are glabrous, 

 so as to exhibit each a narrow sanguineous band ; sometimes with joints 1 — 7 only 

 slightly covered between the sutural sanguineous band.? by brown hairs, and the 

 8th or last joint, i. e. the last joint of the oviduct, glabrous and fulvous. Venter 

 always sanguineous with short, appressed, whitish pubescence, longer, whiter 

 and denser towards the dorsum. Oviduct J— i as long as the other part of the 

 abdomen, with the last joint very long and always fulvous or yellowish. Legs 

 (dried) pale, superiorly black or pale fuscous, except the basal V of the femora 

 and sometimes of the tibise, and with the terminal i or | of the tarsi entirely 

 black; rarely almost immaculate except the tarsi. Wings tinged with dusky, 

 from minute, appressed dusky pubecsence ; the cross-vein between the 1st and 

 2nd longitudinal veins obsolete; the 2nd longitudinal vein attaining the mar- 

 gin only a little before the tip of the wing (as in Dipt. N. A. fig. 1. p. 174), and 

 not recurved at tip. The anterior branch of the 3rd longitudinal vein very dis- 

 tinct at its origin and arising from the main vein nearly as in C. s. batatas, with 

 its tip slightly recurved, so that the whole branch nearly follows the curve de- 

 scribed by one edge of a lanceolate leaf 5 times as long as wide. Length % 

 .09— .10 inch, 9 (including oviduct) .10— .15 inch. Length wing % J .13— .14 

 inch. 



Described from 3 S 3 9 all recent, besides 1 % and 1 9 both dried 

 as before stated. Much smaller than C. s. hrasxicoidea and its allies, 

 and distinguishable from them all by the anterior branch of the 3rd 

 longitudinal vein being remarkably distinct at its origin and much 

 straighter and less recurved at tip, and from C. .s. hatatns and all other 

 Cecldomyia known to me, when recent, by the remarkable white orbits 

 of its eyes. In all the dried specimens but one, these white orbits are 

 tolerably distinct but not obvious, and they are so also in the specimens 

 from *S'. brassicoides and *S'. strohUoUhs. The antennal horns of the 

 pupal integument being obsolete, and not distinct, long, and tipped with 

 black, also separates this species effectually from C. s. batatas. 



C. The following bores cylindrical holes, like a Tomicus, in the 

 solid wood of the largest of the willow-stems from which grow the 

 bunches of the gall S. brassicoides, generally pretty close to the points 



