1908] 



Dragonflies of the Ottawa District 



23 



14. Enallagma exsulans (Hagen), Selys. Fig. K. 



Ottawa, July 28th, 1907, 1 male (Young). 



A longer and more slender insect than the two preceding 

 species, the males readily distinguished from these bv the 

 coloration as well as by the form of the abdominal appendages. 

 In E. H agent and ehrimn, segment 2 is blue above wdth a black 

 spot, that of exsulans entirely black. The abdomen in the first 

 two is blue with black markings, in the latter, black with blue 

 markings. 



Several other species of Enallagma will probably appear 

 about Ottawa. Of tliese the most likely to be found are E. car- 

 uncnlatum Morse, Calverti Morse, pollutum Hagen, and E. 

 signatum Hagen. 



(To be concluded in June issue) 



EXPLANATION OF PLATE. 



A. Hind wing of a member of the Zygoptera, Enallagma Hageni. 



Upper sector of the triangle. 



Lower sector of the triangle. 



Arculus. 



Antecubitals. 



Postcubitals. 



Nodus. 



Basal postcostal vein. 



Pterostigma. 



Basilar space. 



Quadrilateral. 



Antenodal cells. 



Dorsal view of the male abdominal appendages of: 



B. Lcstes congener. E. Lestes disjunctus. 



C. Lestes unguicidatus. F. Chromagrion conditum. 



D. Lcstes uncatus. 



Lateral view of the male abdominal appendages of : 



G.J Enallagma Hageni. K. Enallagma exsulans. 



H. Enallagma ehrium. 



