1908] The Dragoxflies of the Ottawa District. 51 



The characters by which it is separated from the closely 

 allied L. disjundus have been given under that species. 



18. Lestes rectangularis Say. Fig. 2. 



Ottawa, 1 female (Harrington). 



This specimen, which is damaged, was included in L. iin- 

 giiiculaius in the first part of this paper. 



General color metallic brown, the face and under parts pale 

 yellow or greenish. The humeral stripe is rather broad and 

 there arc narrow interrupted yellow rings at the bases of most 

 of the al)dominal segments. The abdomen of the male is 

 extremely attenuated. 



Sub-order. ANISOPTERA. 



Family .^SHNIDAE. 



Antecubitals of first and second series not coincident 

 (except the first and one other) ; inner end of the pterostigma 

 supported by an oblique vein (Fig. 1). 



There are three subfamilies, all of which are represented in 

 the Ottawa collections. These are the Gomphinae, Cordule- 

 gasterinae and Aeshninae. 



In the Gomphinae the eyes are widely separated and the 

 abdomen is without lateral carinae, that of the male being more 

 or less dilated apically. The coloration shews relati\"ely little 

 variation, being usually black or brown with yellow or green 

 bands and spots. They are more local in distribution than most 

 of our dragonflies, but are often exceedinglv numerous where 

 they occu . 



The Cordulegasterinae much resemble the Gomphinae in 

 appearance being black insects conspicuouslv spotted with 

 yellow, but the eyes are larger and are separated above bv a 

 very narrow space or meet at a point. The abdomen is slight- 

 ly or not at all dilated apicalh-. 



In the Aeshninae the eyes are larger and meet for some 

 distance on the top of the head. Lateral carinae are T)re.sent 

 on the abdomen, v.'hich is not at all dilated posteriori v 



Sub-family GOMPHINAP:. 



Of the several genera represented in the eastern provinces, 

 only one, Gomphus, with 4 species, has been met with at Ottawa. 

 Other species of this genus as well as a few belonging to allied 

 genera will be almost sure to reward the efl^orts of the industrious 

 collector in this district, and among these may be mentioned the 

 following: Has,euitis brevistvhis Selys, Opluoi^oiupJius rupin- 

 sulensis (Walsh), Hagen, Dromo^oni pl'ms s pino.sus Selvs, Gomphus 

 scudderi Selys, G. spicaUts Hagen and G. sordidus Hagen. 



Genus Gomphus, Leach. 



