170 ENTOMOLOGICAL NEWS. [April, '16 



fully colored, and has suffered an injury at emergence, by 

 which the fifth segment is spread out flat and bent at a right 

 angle. Apparently the body cavity is completely separated at 

 this point. The injury will explain its weak flight. 



C. conchimis, as a comparison of the figures will show, has 

 the peculiar characters of the genitalia and appendages of 

 zvalthcri still more exaggerated. It is separated at once by 

 these characters from ivalthcri. From demerarae it is separ- 

 ated at once, so far as I can judge from the description, by 

 the sectors of the arculus less widely separated, by the convex 

 distal side of the triangle of the front wings, and by the 3- 

 celled, not 2-celled, anal triangle. There are some differences 

 in the color of the abdomen, and the striking hamules of con- 

 chinus could hardly have escaped de Selys' notice. From 

 tumens it is separated at once by the venational character 

 mentioned above under tumens — the position of the arculus 

 relative to the proximal angle of the subtriangle. C. deme- 

 rarae, hind wing 23, is a smaller species than zvaltheri, hind 

 v/ing 27, and is separated from the latter by the anal triangle, 

 2-celled in demerarae, 3-celled in zvaltheri. Apparently both 

 are separated from tiuj'icns by the closely approximated sec- 

 tors of the arculus of tumens. 



In the figure of the wings of zi'altheri the cross-veii. shown 

 in the supertriangle is undoubtedly not normally present. The 

 brace vein at the stigma is less marked in conchinus than in 

 zvaltheri; in zvaltheri the sectors of the arculus are widely 

 separated at their origin, in conchinus they are still separated 

 but are very close together; conchinus has the proximal angle 

 of the subtriangle more basal, relative to the arculus, than 

 zvaltheri, which in turn has it more basal than tumens: in the 

 number of distal rows of cells posterior to Cu2 in the front 

 wings, tumens and conchinus are alike with 2 rows, zvaltheri 

 has 3 rows; but in the hind wings zvaltheri and tumens have 3 

 rows, while conchimis has but 2; in zvaltheri there are 2 rows 

 of postrigonal cells in the hind wings, and i row in tumens and 

 conchinus. 



The grand genre Gomphus of de Selys has long been a prob- 



