206 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



have bred many specimens, coming forth in twelve or fourteen days.'^ 

 (Norton.) 



Larva. — They are naked, slimy slugs, like those of S. cerasi, 2"^-foote(l ; color pale 

 greeu, at times almost white, enlarged near head. Head white, the six anterior legs 

 amethystine brown, tail segment constricted, rather sharp. (Norton.) 



Saw-fly. — Male and female: Shining black, short and compressed; antennfe slightly 

 enlarged in middle, third joint nearly as long as fourth and fifth ; head polished ; 

 lower ocellus in an oval basin, with three pits beneath ; body wholly black ; legs 

 black, the two anterior pairs clear white below the middle of femora ; tips of their 

 tibiiB waxen ; the basal two-thirds of posterior tibi:e and of first tarsal joint white; 

 tarsi fuscous, apical joint of all the tarsi waxen- white; inner tooth of claws minute, 

 beneath the middle. Wings hyaline, iridescent, nervures blackish, first submarginal 

 cell rounded at base. (Norton.) 



287. Selandria dilufa Cress. 

 Order Hymenoptera ; family Tenthredinid^. 



The following account of this saw-fly has been furnished by Prof» 

 Eiley : 



Spring larvje feeding on the under side of the leaves of the post-oak, often several 

 together during the latter part of May. Just previous to entering the ground the 

 larva sheds its spring skin; enters ground the last of May or early in June. Flies 

 emerge about the first of May following. (Unpublished notes.) 



Larva. — Length of full-grown larva, f inch. Color, pale translucent green, pur- 

 plish on dorsum ; head, green, with two large black spots near the top, and four mi- 

 nute black dots below them, just above the jaws. Dorsum and sides quite thickly 

 covered with spiny tubercles, those on dorsum bifid, while the lateral ones are single. 

 Thoracic legs yellowish, prolegs of the same color as the general surface. (Riley.) 



288. Cecidomyia q.-pilulw Walsh. 

 Order Diptera ; family Cecidomyiid^. 



Fig. 68. Galls of Cecidomyia q.-pilulce. After Riley. 



The following notes on this Dipterous gall-fly have been copied from 

 Professor Riley's notes. I have found it common on the oak iu Octo- 

 ber, at Providence : 



Found in abundance on the laurel-leaved oak, the gall always on the upper surface 

 with the nipple on the under surface of the leaf (October 25, 1869). I find in every 



