224 Benj. D. Walsh on the Insects inhabiting the Galls 



on a bush of S. discolor growing among numerous S. humilis, on which 

 last willow alone this gall had previously occurred. A very similar gall, 

 but differing in the tips of the leaves not being beaked, was gathered 

 on S. Candida by Dr. Geo. Vasey, in Illinois. I have 8 dried speci- 

 mens of it from Mr. Bebb. 



No. 5. Cecidomyia s. rhodoides Walsh. — A % bred in 1865 

 had 24-jointed antennas, counted while recent. The other 8 % bred in 

 1864 had 23 — 25-jointed antennas. Within certain limits the num- 

 ber of joints in the Cecidoinyidous % antenna seems to be constant, 

 and to differ often in different species. 



No. 6. Gall S. coryloides Walsh. — I have since fouod two addi- 

 tional specimens in a different locality, and as before on S. discolor. 

 Thus, in addition to the occurrence of two very distinct but closelv 

 allied bud-galls on the same species of Willow, S. humilis, viz : .S'. 

 rhodoides and *S'. gnapltalioides, we find two very distinct but closely 

 allied bud-galls on the same species of Willow, S. discolor, viz : S. 

 strobiliscus and S. coryloides. 



Xo. 7. Cecidomyia s. cornu n. sp. — (The larva only known 

 before.) % $ . Scarcely differ from Cec. s. batatas Walsh, except 

 in the antennas % being rather shorter and 21-jointed (counted 

 when recent) with the last joint sessile or connate with the preceding 

 not 18 — 19 jointed. Two % , 3 9 , bred May 1-9. In the pupal in- 

 tegument the tips of the antennal horns are scarcely, and the thoracic 

 bristles not at all black, while they are conspicuously so in Gee. s. ba- 

 tatas ; and the larva, as already shown, has a Y-shaped, not as in Gee. 

 s. batatas, a clove-shaped breast-bone. 



No. 8. Gall S. siliqua Walsh. — Besides the single one found on S. 

 discolor, I have since found about a dozen others on that Willow, 

 and received through Mr. Bebb over a dozen gathered on that Willow 

 in New Hampshire by the Rev. W. J. Blake. They can only be dis- 

 tinguished from galls found on S. humilis by their uniformly larger 

 size, which may be due to the rank growth of this species of Willow. 

 Mr. Blake also sent me many specimens of this same gall gathered on 

 S. rostrata in New Hampshire, which were about the same size as 

 those found on S. cordata ; and I have a single dried specimen 

 gathered in Illinois on S. petiolaris by Mr. Bebb. Thus we have 

 what seems to be the same gall growing on six different Willows. S. 

 humilis, S. discolor, S. rostrata, S. cordata, (=S. rigida), S. petiolaris. 

 and according to Dr. Fitch on S. lucida. I said {Proc. etc. III. p. 

 592) that the terminal beak of this gall is never recurved in speei- 



