2 O DON ATA. 



As this nympha is very similar to Gomphus, it probably belongs to 

 Herpetogompbus, which is found in South America, while Gomphus is 

 not. 



There is in same collection and from same locality a larva 5 mm. long, 

 wing-cases just visible ; more hairy ; teeth on lobe of mask ; inside 

 of palpus more marked ; dorsal hooks just visible ; middle anal appendix 

 not thickened at base. 



2. Gomphus pilipes. 



Sei.ts, Monogr. des Gomph., p. 148. 



Plate I., fig. 3, a. b. c. 



Nympha, full-grown female. Locality : S. Carolina. Coll. Hagen. 

 Museum Comp. Zool. Length, 25 mm.; breadth, 10 mm. 



Body flat, lanceolate, sparingly covered with hairs. Head cordate, 

 flat. Eyes rather prominent, large. Ocelli developed. Vertex flat, an 

 oblique groove extending from lateral ocellus to front angle of eye. 

 Antennae, two basal joints globular, 2d a little shortest, 3d twice as long 

 as both basal, straight. 4th rudimentary. Part behind eyes short, 

 notched at middle, hind angles rounded, 2 flat tubercles near hind-border. 

 Mask reaching fore legs, small, oblong, sides bent up ; fore border pro- 

 duced at middle third in small rounded lobe, with comb of bristles. 

 Palpi short, not meeting ; end hook not longer than denticulations ; 

 movable hooks thin, sharp, long. Prothorax narrow, oval, border 

 elevated at sides. Wing-cases reaching to middle of 4th segment. Legs 

 strong, hairy, formed for burrowing. Hind legs more separated at 

 base. Fore and middle legs of equal size, short ; femora short, strong, 

 arcuated; tibia? a little longer, nearly straight; tarsi very short, 2-jointed. 

 Hind legs reaching 8th seg., flat ; tarsi 3-jointed ; claws short, sharp. 

 Abdomen flat, broad, narrowing after Gth segment. Segments 9 and 

 10 very contracted. Segments have three spots on each side, 9th a 

 linear spot. No dorsal hooks. Segments S and 9 have lateral spines. 

 Side-border sharp. Segments of equal length except two last ; 9th 

 longer than 8th ; 10th | as long as 9th ; nearly cylindrical. Anal 

 appendices very short, not | as long as 10th segment, pyramidal, sharp, 

 nearly equal in length. Two lateral a little shorter. A small bifid tu- 

 bercle at end of eighth ventral segment. 



Another specimen from South Carolina, Coll. Hagen, is identical, but 

 smaller ; 25 mm. 



These nymphas are, of course, only referred to G. pilipes as probably 

 belonging there or to a related species. 



