200 



basal. 1 A very large specimen, rather larger than any female 

 I have yet seen. Joints of antennas rather stouter at top than 

 bottom, not globose." Then follow various remarks about 

 head, abdomen, etc. : " When at rest the wings extend be- 

 yond the abdomen one third of its length, of just about the size 

 of Say's fig. 1. His figure errs in making the abdomen 

 extend to the tips of the wings. Abdomen of a dull clay 

 yellow," etc. 



" May 13. Another male evolved. . One antenna has sixteen 

 joints besides the basal, and the other has fifteen joints besides 

 the basal, but the terminal one (in the latter) is rather larger 

 than usual." " When the antennas of the male are perfect, each 

 joint has two sets of hairs. Each joint in fact consists of two, the 

 upper one globose, and rather larger than the lower, which is 

 rather paler." (According to my recollections there is only a 

 slight stricture visible here with a high magnifier, but indicative 

 of a tendency to division, or perhaps rather of the union of two 

 joints. And in some species of Cecidomyia we find this sepa- 

 ration clearly carried out.) 



" May 18. A male evolved ; both antennas have sixteen 

 joints besides the basal. 



" Sept. 6, 1833. On opening a box containing stalks with 

 pupas collected from wheat in garden, July, 1833, I found a 

 male Hessian Fly, and three very small Hymenoptera, etc." 

 "Antennas have seventeen joints besides basal." " I have no 

 doubt that this Hessian Fly came from a pupa of last fall," etc. 

 Sept. 9 (doubtless 1833). " The fly 9 . Posterior part of 

 each joint, of abdomen naked." " Antenna dark red," etc. 

 " Of sixteen joints besides basal ; ultimate longer than penulti- 

 mate." 



" Sept. 23, 1833. 9 . Antennas about half the length of 

 body; fourteen joints besides basal; the terminal joint twice 



1 " Basal " means here, and beyond, what I often called " bibasal " ; the joint sessile 

 on the head, and apparently double. Some persons would consider it , and perhaps 

 properly, as making two joints. 



