1864.] , 623 



we know that they must be in C s. hatatas (pupa), from their tips in the 

 pupal intetrument of that species being quite black, instead of whitish 

 hyaline as they are in (7. albovittata (pupa). 



B. Or THE FOLLOWING species 1 S 3 9 were bred from the Cecido- 

 myidous Gall S. batatas and 2 % from the Tenthredinidous Gall S. 

 ovubim. As there is one variety of S. batatas that is undistinguisha- 

 ble externally from S. ovidum, which grows on the same willow, it is 

 proper to add here that 1 S 1 9 were bred from a variety of *S'. batatas, 

 very distinct from S. ovulum, which had been placed in a separate vase 

 from the other varieties, and that of the two S % bred from *S'. ovulum, 

 I recognized the gall from which one S had made its exit by its being 

 the only bored gall in the vase, and on cutting into it found it to be a 

 true *S' ovulum and not a S. batatas. I have also a 9 bred from »S'. 

 strobiloidts which can only be referi'ed to this species, though I did not 

 take a description of it while recent, and a % bred from tS. brassicoides 

 in 1862, of which the same may be said. Thus we find the same spe- 

 cies inquilinous in certainly 2, and most probably 4 distinct galls, 3 of 

 them made by Gall-gnats and 1 by a Saw-fly. 



Larva unknown. 



Pupa (from the pupal integument.) — The antennal horns are obsolete, and the 

 thoracic bristle is about \ as long as the thorax is wide. The color of the inte- 

 gument is white, the anterior parts scarcely or not at all tinged with dusky. — 

 Two specimens. 



Imago. C. orbitalis n. sp. % 9 (Recent.) — Dull uraber-brown, paler beneath. 

 Head with conspicuous white hair above the mouth, and with its posterior sur- 

 face blackish except a conspicuous, linear, white orbit behind each eye, not in- 

 terrupted between the eyes, which is apparently produced by very minute 

 white hairs. (In the dried specimen this becomes indistinct, but rarely obso- 

 lete.) Antenuffi % g — 3 as long as the dried body, 18 — 19-jointed (-'+16 to 2-|-17), 

 scarcely tapered towards the tip, the flagellar joints globular, the pedicels i as 

 long as the joints and whitish or hj'aline. the verticils full as long as the two 

 complete joints from which they arise, the last joint in the % with 18-jointed 

 antennae sessile and apparently almost connate with the penultimate, in the 

 other % pedicelled as usual. Antennse 9 nearly half as long as the dried body 

 exclusive of the oviduct, slightly tapered, the joints sessile, almost cylindrical, 

 especially towards the tip, and difficult to count, the verticils reduced to an ir- 

 regular pilosity half as long as the % verticils. Thorax with a row of white 

 hairs in each longitudinal suture, simulating a double white vitta. Origin of 

 wings and a large spot beneath them fulvous or sanguineous. Scutel blackish, 

 a little polished. Halteres whitish, the knob sometimes dusky, and in the spe- 

 cimen from S. brassicoides (dried) deep black. Abdomen % dull luteous or dull 



