1864.] 599 



Proctotrupide which occurs in the imago state in November in the 

 central cell of aS^. strohiloides O. S. ; and in these cells there was no 

 Cecidomyidous cocoon, as is also sometimes the case in the cells of C. s. 

 strohiloidea that are occupied by the above Proctotrupide. 



Xo. 10. GrALL S. HORDEOiDES n. sp. — On S. huuiilis. This gall has 

 some resemblance to a beardless ear of four-rowed barley, and differs as 

 follows from S. triticoides : — 1st. The twig on which the cells are placed 

 is not materially enlarged and is of a uniform diameter throughout. 

 ^Ind. The twig is abnormally shortened as in S. triticoides, but only so 

 that the tip of each deformed bud touches or nearly touches the base 

 of the one that succeeds it in the adjoining row. instead of the base of 

 the one in the same row. 3rr7. The entire cells ai*e only .20 inch long, 

 instead of .42 — .44 inch, and they extend only .05 inch, or \ of their 

 entire length instead of 3-5ths of their entire length, into the woody 

 origin of the bud, the deformed buds being not much elongated, but 

 hollow and. as well as the woody part of the cell, polished internally. Ath. 

 The woody origin of the buds is scarcely swelled and protuberant. — 

 Described from one dead and dry specimen, 1.40 inch long and .10 inch 

 in diameter. It contains 10 deformed buds, regularly arranged with 

 no undeformed ones intervening, as is the case in the monothalamous 

 gall S. cornu, when several of them grow near each other. As in some 

 S. triticoides. the tip of the twig has completely shrivelled up and per- 

 ished. Easily distinguished from the monothalamous, Tenthredinidous 

 gall, S. gemma n. sp., which occurs on the same Willow, by there being 

 no normal buds between the affected buds, and by the buds themselves 

 not being abnormally swelled out laterally, and being hollow, not solid, 

 inside. But for the fact of several of the deformed buds having been 

 bored by minute parasites, I should never have suspected this specimen 

 of being what it most undoubtedly is — a true Cecidomyidous gall ; 

 and but for its strong homologies with S. triticoides. I should hesitate 

 whether to consider it as a congeries of solitary galls, like aS'. cornu. or a 

 true polythalamous gall, where the twig itself is swelled and deformed 

 and converted into a gall, like S. triticoides. It must be very difficult 

 of discovery, when it is recent and the cells are unbored by any parasites. 

 Larva, pupa and imago unknown. 



No. 11. Gall S. nodulus. n. sp.— On S. longifolia. A small, monothalamous, 

 woody gall, sometimes terminal but generally not so, scarcely ever including 



