SYNOPSIS OF SPECIES DESCRIBED. I I 



20 C. flavomaculata Vander Linden (Ra 



( toe male m mpha skin. E 



S ailar to C. metallica; smaller, undulated line on head more marked, behind on 

 each side four ovoid flat spots with a rough stripe in three of them; 

 dorsal hooks on 6th to 9th - pines sharp, benl backwards; lateral spines on 



8th very short, on 9th sharp, flat, longer than 10th as long 



ni'l 10th, trigonal, sharp. 



21. C. albicincta Burmeister. (Suppo 



Nearly lull-grown nympha?. North America. 



Bodj oblong, enlarged ami truncate at tip, dark brown, very hairy: head short, 

 undulated transverse line very slightlj marked; on each side near hind corner a hunch 

 of stiff bristles; abdomen roof-shaped, slightly sloping toward the truncate tip. no dor- 

 sal hooks; lateral spines <>n 8th and 9th segments flat, very short, a little incurved; 

 aual appendages short ; ventral edge of '.ith segment hairy. 



22. C. species ignota. 



One not full-grown male nympha. Hermit Lake. New Hampshire. 

 Body Hatter, very slightly hairy; similar to C. albicincta; under side of abdomen 

 yellow, with three longitudinal black bands; lateral spines longer and more slender. 

 Could it belong to C. Walshii Scudder ? 



23. C. Grayi Selys. (Raised.) 



Nympha skin and two full-grown nymphae, one in transformation. New Zealand. 



Body somewhat rounded above, naked, sloping at tip ; forehead flat : no dorsal 

 hooks; lateral spines on Sth and 9th segments very small, sharp; appendages similar 

 to C. metallica. 



24. Cordulia spec. 



Three nymphae in alcohol, from Prof. Forbes, Pekin, 111., Oct. 9, 1874. 



It differs from the general type of the Cordulina larva?, and resembles more the 

 Libellulina; the eyes, however, probably refer it to the Cordulina. Body oval, breadth 

 more than half length; head twice as broad as long; mask extending to middle legs; 

 dorsal hooks present on segments 7th, 6th, 5th, and 4th. smallest on 7th, largest on 5th; 

 lateral spines small, less developed than in Cordulia generally ; head, antennae, dorsal 

 hooks, and legs hairy. 



Perhaps Libellula obsoleta (Say). 



