PROGOMPHUS. Y 



sions on occiput. Mask extending to fore legs, narrow ; length twice 

 the breadth ; somewhat enlarged forward, with middle channel widen- 

 ing forward; front border produced in semicircular lobe, edged with 

 hairy comb ; the bans forming this are enlarged at tip and flattened, 

 inserted in small basal cylinder. Palpi short, bent, ending in blunt 

 hooks, smooth inside ; movable hooks long, sharp. Prothorax nearly 

 circular, rounded at fore-border, with two oblique impressions ; side- 

 border very slightly raised ; prothorax polished, shining, near borders 

 and middle line slightly granulated. Whig-cases extending beyond 

 4th segment. Legs stout, short, hairy, typical burrowing legs. 

 Hind legs much more widely separated at base than fore and middle 

 legs ; middle legs nearer at base than fore legs. Fore legs somewhat 

 stronger than middle legs, the coxa? being highly developed, and the 

 femora triangular, arcuated and dilated at base. Tibia? thickened at 

 middle, near the end bent and narrowed ; tarsi somewhat shorter and 

 bent up ; 1st joint very short, 2d long, knife-shaped ; hooks stout, 

 rather blunt, outer hook rather shortest. Middle legs similar in shape, 

 coxa? smaller, femora narrowed at base. Hind legs reaching 8th seg- 

 ment, similar in shape to the other legs, flatter. Tarsi 3-joiuted, longer 

 than tibiae ; claws sharp. 



Abdomen as in JEschna, venter flattened, dorsum rounded, largest at 

 5th segment, tapering toward end. Segments 1 to 9 with strong dor- 

 sal hooks. Side-border sharp. Segments 5 to 9 have lateral spines. 

 9th and 10th ventral segments not hollowed beneath, polished. The 

 three anal appendices rather longer than 10 segment, pyramidal, sharp, 

 of equal length ; two lateral ones half as long, blunt, pyramidal. 



This nympha is distinguished by highly developed burrowing legs, 

 fore legs strongest ; coxa?, femora, and tarsi much developed. Middle 

 legs are nearest together at base, a peculiarity also distinguishable in 

 Gomphoides. Hind legs highly developed. Abdomen exactly like 

 JEschna. Segments of equal length, 10th perhaps a little shorter. 

 Ventral 9th not making part of the hollow of rest of abdomen ; stig- 

 mata jdaced outside of hind angles of prothorax. Shape of antennas 

 and mask refer this nympha to Legion Gomphoides. It might be sup- 

 posed to belong to genus Progomphus, if that genus were found in New 

 England. 



A female nympha not fully grown. 2-3 mm. length, precisely like fore- 

 going, but darker in color, from Carundahy, Brazil. Thayer Exp., is in 

 the coll., unless some mistake in locality lias been made in the label. 



