"96 THE CANADIAN ENTOMOLOGIST 



nets, i. e., more than all previous captures of interrogatum up to 

 that time. All the insects were fully adult and flying in coitu. 



Dr. Walker's descriptions and illustrations of this species are 

 so thorough that little remains to be said. In the long series, 

 iiowever, one very obvious colour \ariation attracted attention, 

 viz., that in several of the males, dorsal view, the black marking 

 . nearest the thorax (segment 3) is not pointed, but a plain black 

 band. 



For three seasons I have been on the lookout for interrogatum, 

 and have m_ade a practice wherever I noticed insects of the genus 

 flying to capture a few for examination. At the slough in question 

 I had examined both resolutum and angulatuni before coming upon 

 the prize. Now that I ,ha\e located the spot where the insect 

 anay be described as common, it- might be well to record it. It is 

 the round slough north of the track, to be seen from the train just 

 iDefore pulling into Nordegg. The water is about eighteen inches 

 ■deep and cibounding with "suckers." The bottom is soft mud 

 and free from weeds, though, at the margins, a slight fringe of 

 reeds rises from the moss. A tamarack swamp adjoins the pond. 



Of the specimens tciken I placed 12 couples in alcohol and 

 papered the. balance in pairs. New to Alberta list, and most 

 westerly record. 



Libellulidae. 



CORDULIIN^. 



30-129 Somatochlora aJbicincta Burm.eister. 



At Nordegg between 12th and 19th July I took some 18 

 males and 3 females of this species. Of these two or three we're 

 •captured at the top of what is locally Icnown as Coliseum Moun- 

 tain, 6,500 feet, one or two at the camp 1,200 to 1,500 feet below, 

 and the balance down in the valley, say 4,000 feet. On 19th 

 July, 13 males and 1 female were captured at the round slough 

 •described above (see C. interrogatum) flying with S. hudsonica 

 and C. shiirtleffi. On that day I searched the mossy edges of the 

 pond for nymphs and took a number of exuviae of Mshna eremita, 

 M'hich was in company with A. juncea, on the wing there and a 

 series of what on circumstantial evidence should be S. albicincta. 



With regard to the adults of albicincta that I captured, there 

 was one feature in the general appearance that immediately 



