338 



great amount of good in devouring insects injurious to the different 

 crops. This is a question worthy of investigation by our Doraini-^n 

 Entomologist if he has not already examined it. 



Dijjla.v Sootier, Don., is less common, though not rare ; it seems 

 to be a hardy .species. I caught one in Stewarton on the tirst of 

 November, when the weather was so cold that no other insects were to 

 l>e seen, at least flying about. The wings are plain and the body 

 black. 



Diplax Iludsonica, Selys, is much the same as D. Scotia. The 

 abdomen, however, is not of the same shape, and has a yellowish spot 

 on the fifth segment ; besides, it has a very conspicuous white mouth. 



Diplax costifera, TJhler. — Abbe Provancher says this is the first 

 one of this species he has ever seen. I am not positive whether I got 

 it at Casselman, on the Canada Atlantic Railway, or at Stewarton, but 

 am under the impression it was at the latter place, in a meadow near 

 Patterson's creek. I visited the same locality frequently during the 

 past summer for the purpose of seeming another, but could not see one. 

 The specimen I have is so mutilated that it is impossible to ascertain 

 whether it is a male or a female. It somewhat resembles the female of 

 Diplax ruhicundula, except that there is a yellow line on the anterior 

 margin of each wing, extending from the pterostigma to the base. 



Diplax semicincta, Say, is also rather rare around Ottawa. I cap- 

 tured one at Casselman, on the line of the C. A. Ry., summer before 

 last, and I saw another the same year, in the vicinity of Hull, but did 

 not secure it, and have not seen one since. Mr. Fletcher captured a 

 pair of this species on the Aylmer road, on the 20th Aug. last. It is 

 smaller than any of the Diphix described, and the basal half of the 

 wings is clouded a sort of rust colour. 



I have now mentioned all of the insects of the Odonata in my col- 

 lection, but a few more are still in Abbe Provancher's possession await- 

 ing determination. As very little attention has been given to this 

 family, it is s:ife to say that many more of the species mentioned from 

 Quebec, ami porhaps others not included in the Abie's list, will be found 

 here ; and perhaps, some altogether new to science. It would, at least, 

 be reasonable to expect this, in view of the many discoveries entirely 

 new to science made by Mr. Hanington an I Mr. Guignard ii\ connec- 



