THE CANADIAN ENTOMOLOGIST. 105 



female, the 3rd slightly curved. Thorax narrow. Wings much larger than 

 the females. Abdomen very small and much compressed laterally ; in 

 other respects not differing materially from the female. 

 Length — body .09, wing .14, antennae .09. 



This species is often found with C. affinis, but both gall and insect 

 are quite diiferent from that species. 



C. PIGRA, n. sp. 



The galls of this species answer perfectly to Baron Osten-Sacken's 

 description of C. q. tumifica. They are large irregular swellings on the 

 midrib of the leaves of Q_. ti?ictoria, always on the under side and usually 

 on the lower half of the leaf Sometimes two distinct galls are found on 

 the same leaf. Their presence is only indicated on the upper surface by a 

 widening of the midrib and a slight depression of the leaf at that point. 

 They are often an inch in length and in the middle half an inch in 

 diameter, tapering more or less towards the ends. They are of a dense 

 cellular tissue, with the woody fibre of the midrib along the axis. The 

 cellular portion contains a large number of larval cells, which are insepar- 

 able from the enveloping substance. 



Having discovered a young oak nearly all of whose leaves had these galls 

 upon them early in June last year, I made frequent visits to it to watch the 

 development of the larvae. Quite sure that they would prove to be Cynips 

 q. tumifica, I expected to find the insects fully matured early in July, but 

 at that time the larvae could scarcely be seen in the soft, immature vege- 

 table cells that surrounded them, and it was late in autumn when the per- 

 fect insects made their appearance. This extremely slow development 

 suggested the specific name. The gall flies are all females, and differ 

 widely from C. q. tumifica O S. 



Description : Head, thorax and abdomen deep black. Ocelli small, 

 widely separated and inconspicuous in the rather coarsely rugose surface 

 of the vertex. Antennse 14-jointed ; ist joint short, club-shaped, 2nd 

 ovate, 3rd not quite as long as the ist and 2nd taken together; 4th, 5th 

 and 6th each a little shorter than the one immediately preceding it. The 

 remaining joints sub-equal and scarcely shorter than the 6th. Color at the 

 base is a clear yellowish brown changing gradually to a light dusky brown 

 at the end. Tliorax finely nnd evenly punctate. A favorable light re\eals 

 two extremely faint, i^arallcl lines that extend half way from the coUare to 

 the scutellum. They might more properly be called depressions, as they 



