1864.] 625 



from which the separate galls of the bunch spring, and generally where 

 a good-sized willow-stem has been arrested in its growth by the galls 

 and forms an elongate-oval swelling, from which arise the galls, and 

 intermixed with them a few slender, half-starved twigs. The interior 

 surface of these holes or burrows is always much blackened and disco- 

 lored, and they open outwards through the bark, which gave me the first 

 hint of the presence of an insect in so unlikely a locality. But even in 

 so retired a situation as this, ensconced as he is in his burrow and sur- 

 rounded on all sides by the dense, cabbage-like galls of his Hosts, the 

 avenging Nemesis pursues the unfortunate Guest ; for he is preyed 

 upon to a very great extent by a parasitic Chalcidide belonging to Eu- 

 )\i/tomi(h's<. which I bred to the imago state from pupse found in the 

 burrows of the Guest Gall-gnat himself. Thus, even in Insect Life, 

 sooner or later punishment overtakes those, who live, not on the fruits 

 of their own exertions, but by the unrequited toil of their neighbors. 



Larva unknown. 



Pupa. — Several specimens examined July 16 had the abdomen yellowish or red- 

 dish, and the rest of the body, including the antennae, legs and wing-cases, black- 

 ish. The antennal horns were very long, being l-6th — l-7th as long as the body 

 and projecting almost horizontally forwards so as to touch one another through- 

 out, the basal i of each forming a cone with its sides in an angle of about 40°. 

 the terminal V suddenly contracted into a slender, cylindrical thorn, scarcely 

 tapered and scarcely acute at tip. Length (living) .09 — .12 inch. The pupal 

 integument (1 specimen) has the thorn at the tip of the antennal horn black, 

 showing that that part in the living pupa is thickened for the purpose of ena- 

 bling it to work its way out through the wood in which it resides. The conical 

 part of the antennal horn, and in a less degree the anterior end ot the body, are 

 slightly obfuscated, the rest of the integument, including the antennae, legs and 

 wing-cases, being as usual whitish-subhyaline. 



The antennal horns are much longer in this pupa than in any other 



known to me, whence the specific name. 



Imago. C. cornuta n. sp. 'J, (dried.) — Dull rufous when immature, brown-black 

 when mature, paler beneath. Head with the antennae pale brown, 3-5ths as long 

 as the bodv, 10 — 17-jointed (2-|-14 to 2+15), the same individual in one instance 

 having 16 joints to one antenna and 17 to the other, the flagellar joints globular, 

 the i^edicels 4 as long as the joints, the verticils as long as 2i of the complete 

 joints from which they spring, the last joint whether in the 16- or 17-jointe(l 

 antenna sessile and closely united with the penultimate. Thorax with erect 

 blackish hairs. Scutel and metathorax always dull rufous. Origin of wings 

 and a large spot beneath them dull rufous. Halteres pale, the club blackish 

 even in the immature specimen. Abdomen blackish, with rather long, erect 



