THE CANADIAN ENTOMOLOGIST. 207 



segment 7 being the widest portion of body. Segments 6 to 10 are 

 nearly equal in length and much longer than segment 5, but segments 

 7 and 8 are equal and slightly the longest in the body. Segments 9 to 

 II are gradually narrowed aud successively slightly shortened, 12 and 13 

 being much more narrowed and more or less retracted within posterior 

 end of body. Whole integument bare, with a minutely rugose-appearing 

 surface. Anal segment with a perpendicular median wrinkle on lower 

 half; twelfth segment bearing above on posterior margin a pair of minute 

 short horn-like prolongations of the integument, projecting transversely 

 inward towards each other, the tip of each pale brownish. Mouth parts 

 appearing as a pale brownish spot in centre of capital segment, with a 

 minute brownish dot on each side at edge of it. Breastbone pale 

 brownish, nearly as wide as long, or narrowed on basal half or more, 

 with a pair of 2-jointed palpus-like organs on terminal portion, the tip of 

 each minutely darker at the suture dividing the two joints, the basal 

 joint stout and rather elongate subconical, the terminal joint minute and 

 very short conical. 



Described from six specimens, taken from galls on November 13th. 



Puparium of Platygaster obscuripeniiis,h.^\\m.. (containing transformed 

 adult). — Length, 2 3-5 to 2 4-5 mm.; width posteriorly, i to i 1-5 mm.; 

 width anteriorly, about 3-5 mm. Colour light yellowish-brown, appearing 

 dark brown where the adult shows within. Subcylindrical, gradually 

 narrowed and subtruncate anteriorly, rounded oval posteriorly. Surface 

 of whole integument minutely punctured. Circular surface of plate of 

 anterior subtruncate end somewhat wrinkled and roughened, with a small 

 central lighter-coloured tubercle, and with an organ on lower edge of 

 plate forming part of integument and bearing a striking resemblance to 

 the breastbone of the cecid, but probably representing the mouth parts 

 of the hymenopterous larva. 



Described from four specimens taken from galls, Nov. 13. 



Adult of P. obsmripennis. — Length, i 4-5 to 2 2-5 mm. Wholly 

 shining black, legs pale brownish except most of femora and sometimes 

 part of tibiae black. Wings nearly transparent, very faintly smoky, 

 reaching beyond abdomen, thickly and minutely short hairy. 



Mr. Ashmead also identified a second parasite bred from this cecid 

 as Decatoma sp. 



