NORTH AMERICAN NEUROPTERA. 253 



The nymphae actually known are certainly not sufficient for more strin- 

 gent conclusions. The existence of at least two large groups (palpus 

 with terminal hook or without it, corresponding with the difference in 

 the front margin of mask) is proved ; if there exist more, as it is possi- 

 ble, and indicated by the nymphfe supposed to belong to Cyclogomphus 

 and Epigomphus, farther experience has to decide. 



The question of accepting a higher rank than that of subgenus for 

 some of the groups now proposed, can only be decided after a sufficient 

 knowledge of the nymphae of the other subgenera accepted for known 

 imagos. 



Sub-genus Onychogomphus (raised). 



Head cordate; antennae rather slender. 3d joint long, cylindrical, 4th short, one- 

 third as long as 3d, conical; mask one- fourth longer than broad, middle third of 

 front margin produced in a rounded lobe with pavement teeth and a comb of flat 

 scales ; palpus triangular, tip rounded and a little bent ; movable hook long, sharp ; 

 abdomen three times as long as broad, scarcely broader than the head, all segments 

 of equal length, the four apicals tapering ; dorsum slightly rounded ; lateral spines 

 on segments 2to 9; only indications of dorsal hooks; genital parts not marked; 

 appendages a little longer than last segment, triangular, sharp, the inferiors a little 

 longer; legs short, strong, 3d joint of posterior tarsi visibly longer than the two 

 basal ones. 



The nympha resembles those of Progomphus ohscurus in shape, but 

 is easily separated by the equally distant four anterior legs. The nympha 

 is known of but one of the twenty-two described species, therefore the 

 genus character may have to be modified, when more species are known. 



1. Onychogomphus lineatus (raised). 

 Selys. Monogr. Gomph. p. 48. 



In alcohol fifteen nympha skins and nymphae full grown or less, one 

 very young. With the nympha skins a teneral male imago. 



From swamps of East Jumna, a holy tank near Delhi, East India ; 

 Kev. M. M. Carleton, 1875. Length 21-27 mm.; young, 11 mm. 



Body rather prismatic; abdomen as broad as head, three times longer than 

 broad; head and antennse very hairy; joints 1 and 2 short, 3d long, cylindrical, 

 rather stouter at tip, which is truncate; 4th small, conical, one-third of 3d; mask 

 reaching first legs, one-fourth longer than broad, middle third of front margin 

 produced in a rounded lobe about four times broader than long, with square pave- 

 ment teeth ; above and before the teeth are inserted in a short, rounded base flat 

 scales, forming a comb, four times longer than the teeth ; the scales are divided 

 by longitudinal folds more strongly marked at tip, which is not split, though it 

 looks so, being folded up: palpus triangular, tip rounded, a little curvated ; 

 movable hook much longer, sharp ; the inner margin of both with faint linear 

 impressions; mandibles with four lancet-shaped teeth at tip, the inner ones 

 shorter ; second row very small ; between two sharper teeth are five very small 



