THE CANADIAN ENTOMOLOGIST 229 



A NEW SPECIES OF SOMATOCHLORA (ODONATA) WITH 

 NOTES ON THE CINGULATA GROUP. 



BY CLARENCE HAMILTON KENNEDY, 

 CORNELL UNIVERSITY, ITHACA, N.Y. 



While gathering material during the past year for a list of 

 western dragonflies, the writer has had the privilege of examining 

 these insects in nearly all the large collections of the United States. 

 Particular attention was paid to the genus Somatochlora because 

 of the meagre data heretofore published on these rare insects. 

 ]\Iuch difficulty was experienced in finding enough material in any 

 one collection to make adequate comparisons of related species. 



The writer wishes to thank Dr. Holland and Mr. Hugo Kahl, 

 of the Carnegie Museum, for the privilege of using the specimen 

 in the Carnegie Museum collection as a type. 



Dr. Walker has promised to monograph this genus. It cer- 

 tainly needs thorough overhauling by someone who can assemble 

 all the material for careful comparison. The identity of many of 

 the females is a matter of conjecture. 



Somatochlora walkeri n. sp. 



Holotype. — Male, collected on the Kuskokwin River, Alaska, 

 by A. Stecker, and now in the Carnegie Museum of Pittsburgh, 

 Pa. 



Allotype.- — Female, a broken specimen in the collection of the 

 Museum of Comparative Zoology. It is a part of the Hagen col- 

 lection and is labeled "Epith. septentrionalis 9 Hag. Saskat. 

 Scudder, F. C. Gray's Fund." Segments 4 and 5 are missing, 

 which give it the small size of septentrionalis. 



Near htidsonica, but colour very dark and appendages dif- 

 ferent. More remotely related to septentrionalis, albicincta and 

 cingulata. 



Length of abdomen, male (exclusive of appendages) 32 mm., 

 length of appendages 3 m.; female with abdominal segments 4 and 

 5 missing, but the abdomen without appendages is probably about 

 34 mm. Length of hind wing, male, 33; female 29 mm. 



Male. — Colour: labium yellow, labrum black, anteclypeus 

 creamy, postclypeus black. Frons black with metallic greenish 



July, 1917 



