004 [December 



Fupa. — The first pupse were found March 16 and others were noticed up to 

 April 15. Those first noticed were all bright sanguineous; the last, which were 

 probably just about to transform, had the abdomen dull luteous and the rest of 

 the body, including the legs, blackish. The horns at the base of the antennae 

 are long, elongate-conical, about i as long as the diameter of the thorax, diverg- 

 ing from each other at an angle of about 45° and terminating in a short thorn. 

 The thoracic bristle is i as long as the diameter of the thorax, and is both in 

 the living and the dried specimen basally whitish but terminally black. — 

 Length (1 specimen, dried) .10 inch. 



The pupal iiite<^ument (21 specimens) is whitish, the head and an- 

 tenna?, but not the wing-cases, very slightly tinged with dusky, and 

 the thoracic bristles and the tips of the antennal horns conspicuously 

 black. The pupa, just before transforming into the imago, works i its 

 body out of the gall and generally transforms in that position, but some- 

 times loses its hold and falls entirely out. The horns at the base of 

 the antennae are no doubt elongated in this species, and as shown by 

 their color in the pupal integument terminally thickened, to enable it 

 to bore its way out through the sponge of the gall, whereas all the pre- 

 ceding species, with the single exception of C. s. noduhis^ the pupa of 

 which is unknown, merely have to bore through the filmy substance of 

 their cocoons. They are still longer and in the pupal integument en- 

 tirely black in the incjuilinous C. conntta n. sp., which has to bore its 

 way out through the wood of the willow twig in which it resides. 



Imago. C. s. batatas n. sp. — % 9 (Recent.) Pale reddish-brown, or reddish - 

 brown, or umber-brown, or brown-black, paler beneath. JTead with its poste- 

 rior surface dusky; antennpe % about | as long as the dried body, 18— 19 jointed 

 (2-|-i6 to 2-|-17), the last 2 or 3 joints without any distinct pedicel, the antenna 

 otherwise constructed precisely as in % C. s. brassicmdes. Antennae 9 not quite 

 ^ as long as the dried body exclusive of the oviduct, with apparently a joint 

 or two less than the % , the joints difficult to count, otherwise as in 9 C. n. 

 brassicoides. Thorax with a row of whitish hairs in each longitudinal stria, 

 giving the appearance of two whitish vittse, and with irregular lateral whitish 

 hairs, the three interstices glabrous. Origin of wings and a large spot beneath 

 them orange-color or sanguineous, in the dried specimen dull rufous. Halteres 

 pale, the club often a little obfuscated. Abdomen 9 above and below sanguine- 

 ous with short whitish hairs and generally a lateral subterminal tuft of longer 

 whitish hairs on each joint of the dorsum ; sometimes in the more mature spe- 

 cimens with a broad vitta of short, brown hairs covering nearly the entire dor- 

 sal surface and the lateral hairs whitish with a definite dividing outline ; some- 

 times with the sanguineous color of the entire dorsum completely concealed, 

 except at the sutures, by short, brown hairs and the oviduct also brown. Ovi- 

 duct sometimes protruded so as to be j as long as the other part of the abdo- 



