THE CANADIAN ENTOMOLOGIST. 



from these galls during the last week of April, 1887, and I failed to 

 separate them from Toronto specimens. 



From 1883 to 1888 several annual collections of galls were made, all 

 from S. humilis, from Toronto and from a locality 35 miles north. From 

 these emerged numerous specimens of the producer, the parasite Tory 111 us 

 spkndidus, and a few specimens of the Chalcid parasite Encyrtus buccu- 

 latricis, Howard, a species seldom reported as occurring in Ontario. 



Rhabdophaga cornu, Walsh, Cecidomyia salix-cornu. 



These galls are deformed lateral buds towards the ends of branches 

 of upland willow ( Sa/ix humilis). They vary much in form and size, 

 from semi-cylindrical, measuring 9 x 25 mm., to somewhat ovoid, 

 measuring 7x10 mm.: the average of 200 galls was 8 x 20 mm. The 

 galls are flask-shaped, slightly curved, rounded at the base, tapering to- 

 wards the upper end, which ends in, a slightly curved beak, out of which 

 the occupants emerge. The) resemble the galls of R, siliqua, but are 

 considerably larger. They are hard and woody, of a greyish-brown 

 colour resembling that of the branches, and often bearing leaves, occasion- 

 ally branchlets 1 to 3 inches long, and rarely £ and 9 catkins. On 

 August 1st, 1S93, I found these galls full size, but soft, easily cut with a 

 knife, and of a greenish-yellow colour corresponding to that of the branches 

 of the season. Annual collections of galls were made from 1883 to 

 1893 — most of these from near Toronto, some from distant points, Port 

 Sydney, Muskoka, Temagami, and other localities. The date of emergence 

 of producers varied from April 26 to May 12; the parasites Torymus 

 sp/endidus, Walk., and Encyrtus bucculatricis, Howard, emerged about 20 

 days later, and still later emerged two species of Chalcid parasites, Pter- 

 oma/us (?) especially numerous one season (1885). From a lot of galls 

 sent to me from Owen Sound I reared two specimens of the parasite 

 Torymus Brodei, Ashm., which is a more or less common parasite of the 

 White Oak leaf galls, Acrespis pczomachoides. Two seasons there emerged 

 many specimens of a thrips ; the function of these was probably inquiline. 

 In cutting open some of the old galls, in one I found a curculionid beetle. 

 The interior cell of the gall is ample, extending from the base to apex of 

 tube, and in spring the larvae and pupa} are enclosed in a fragile silken 

 cocoon. The producer is a fine large Cecidomyid, one of the most 

 beautiful of the group. 



The geographical range is wide ; I have received specimens from 

 Oak Lake and Souris, Man., and from Tisdale, Sask. 



