206 THE CANADIAN ENTOMOLOGIST. 



The above include the smallest and largest. The smallest are not 

 fully developed, and lack the tapering tip ; while the longest depend for 

 their length on this tip being well elongated, since it will be seen that 

 the width of the larger ones is more nearly equal. The smaller galls, 

 while varying in length 8 mm., vary in width 3)^ mm. But the larger 

 ones, while varying in length 7 mm., vary in width only 2 mm. 



Of these 200 galls, thirteen were opened on Nov. 13, the same day 

 collected. Six contained the plump, perfectly white larva ; while the 

 other seven contained smaller light brown, elongate puparia enclosing a 

 transformed hymenopterous parasite alive and ready to emerge. One of 

 the parasites which was pulled from its puparium moved its legs and 

 showed signs of life. The galls containing these hymenopterous puparia 

 were the most dried ones in appearance, and were on dead branches. 

 This parasite seems to remain transformed within its puparium in the 

 centre of the galls all winter, issuing in the early spring. Specimens 

 were bred and identified by Mr. Ashmead as Platygaster obscuripefinis, 

 Ashm. On March 16, 1893, four of the cecids were found issued and 

 dead ; while there was a number of the parasites issued, and only one or 

 two of these dead, most of them being very active and one pair in coitu. 

 Up to March 24, 1893, one more cecid had issued, making five cecids in 

 all ; while of the parasites ten had issued. In issuing, the cecids some- 

 times, if not frequently, leave their pupa-skins sticking by the abdominal 

 portion in the tip of the cone-like gall. On April 9, 1893, 30 more cecids 

 were found issued and dead, 2 more alive, and 2 blackish pupse issued 

 from galls. Not a single parasite had issued since March 24, but ** live 

 one appeared April 9. 



The following are descriptions of the occupants of this gall : — i^arva 

 of Cecidomyia salicis-brassicoides. — Length, 2 3-5 to 3^ mm.; width, 

 I 3-5 to 2 mm. Colour perfectly pure white originally, changed by 

 immersion in alcohol to rosy or pale orange. Oblong-oval in form, 

 plump, fleshy, apodous, consisting of 13 segments. Head rather sunken; 

 and retracted within anterior end of body, little more than one-third 

 width of next segment; latter hardly more than one-half width of third] 

 segment, which in turn is considerably narrower than fourth, and the! 

 fourth is narrower than fifth. These segments are all about the same 

 length so far as length is appreciable in their partially retracted condition. 

 Segments 6 to 8 are very slightly wider than 5, nearly equal in width,] 



