18G4.] 605 



men, sometimes so as to be only J as long. Abdomen % , unless my memory 

 fails me, liiteous when recent, otherwise much as in 9 • Legs (dried) silvery 

 white or yellowish white with the superior surface, especially towards the 

 knees, and also the tips of the tarsi, sometimes strongly, sometimes scarcely, 

 blackish. Wings slightly tinged with dusky from minute, appressed, dusky 

 hairs, in 3 9 (both recent and dried) tinged with brown throughout, in 2 J 

 (both recent and dried) tinged with brown towards the tips. The costal vein 

 generally coarse a id brown black, sometimes finer and the color of the wing. 

 The cross-vein between the 1st and 2nd longitudinal veins obsolete. The 2nd 

 longitudinal vein scarcely recurved at its tip. The anterior branch of the 3rd 

 longitudinal vein distinct throughout, and springing from that vein at an angle 

 of about 135° for a very minute distance, when it suddenly curves round and 

 assumes such a direction, that it appears at first sight to be a continuation of 

 the main vein rather than a branch of it: and it is scarcely recurved at tip. 

 proceeding nearly in a straight line, till it almost attains the margin, when it 

 fades out. — Length (dried) % .08 inch, J (including oviduct) .10 — .18 inch. 

 Length wing % .13 inch, 9 -H — -^3 inch. 



Two S , forty-one 9 • I" this species, unlike all the preceding, the 

 abdomen % 9 retains its colors very tolerably in the dried specimen. 

 The 9 9 ^^6ry greatly outnumbered the S S . and the 9 9 came out 

 April 8 — May 10 and subsequently, and what is unusual in insects the 

 % S not till long after the 9 9 > or the last of April and the beginning 

 of May. Mr. Edwards has remarked to me that in many species of 

 butterflies the S S make their first appearance several weeks before 

 the 9 9 • ''^"fl I have observed the same thing myself, not only of seve- 

 ral butterflies, e. g. NathalU lole Bdv., but of many other insects be- 

 longing to diffierent Orders, and believe it to be a general, though by 

 no means a universal' rule. This species differs from the inquilinous 

 Cec. nlhovittata n. sp., which infests this as well as several other Wil- 

 low galls, in its much larger size, and in the % antennae being 18 — 19- 

 jointed instead of 14 — l5-joiiited, and in the comparative shoi-tness of 

 their pedicels. In other respects the two species, even when recent spe- 

 cimens are placed side by side, cannot be distinguished, except by a re- 

 condite character in their venation. From the inquilinous C orhitalis 

 n. sp.. which infests this and several other Willow galls, it is easily dis- 

 tinguishable when recent by the posterior surface of the head being 

 uniformly dusky and showing no white ring round the eye. From both 

 species the pupa is at once separated by the very elongated horns at 

 the base of the antennas. My other inquilinous species are quite dis- 

 tinct. 



