NORTH AMERICAN NEUROPTERA. 257 



angular, sharp prolongations ; lateral spines only on segments 7 to 9 ; 

 lateral appendages shorter than in the other species ; legs and abdomen 

 rather more hairy ; no linear blackish spots on the segments ; the smaller 

 nymphse with less marked dorsal hooks. 



The large nympha Cabot p. 1, pi. 1, fig. 2, formerly supposed to 

 belong to Herpetogomphus is now described as Epigomphus. 



Sub-genus Ophiogomphus (raised). 



Head cordate ; antennae stout, joint three enlarged, fourth very small, conical or 

 rudimentary ; mask quadrangular, scarcely longer than broad, a little narrowed 

 at base ; middle third produced in a very short rounded lobe with pavement teeth 

 and a comb of fiat scales; palpus short, straight, rounded at tip, very finely ser- 

 rate; movable hook short, sharp; abdomen lancet shaped, about half as broad as 

 long, dorsum roof shaped ; lateral spines short on segments 6 to 9 or only on 7 to 

 9; dorsal hooks on segments 2 to 9 sometimes merely indicated on the middle 

 segments; segments of nearly equal length, 10th only half as long; the four apical 

 segments tapering; genitals of both sexes visibly marked; appendages longer 

 than last segment, triangular sharp, the lateral ones a little shorter: legs short, 

 the four anterior equally distant at base, the posteriors more separated ; joint three 

 of posterior tarsi as long or longer than the two basal ones. 



'i'he nymphae of Ophiogomphus are very much alike to those of sub- 

 genus Gomphus, but visibly stouter. There is no difference among the 

 nymphae of Ophiogomphus and Herpetogomphus. 



The nympha is described for six of the ten known species. 



6. Ophiogoinplius coltibrinus (raised). 



Selys Monogr. Goniphin. p. 76. 



A dry female nympha with the imago half transformed. 

 Orono, Maine, by Prof. Fernald.' Length '^3 mm. 



Head strongly cordate, eyes prominent ; antennae short, third joint less than 

 thrice the length of the two basal ones, flat, very much enlarged to tip; fourth 

 joint rudimentary, represented by a larger rounded knob, a little pointed inter- 

 nally, forming the tip of joint three; mask quadrangular, narrowed at base, mid- 

 dle third produced in a short rounded lobe with pavement teeth and a comb of 

 scales: palpus short, straight, somewhat narrowed to the rounded tip, very finely 

 serrate; movable hook sharp, not reaching the base of the opposite one; wing 

 cases covering segment 4; abdomen half as broad as long, tapering on tip, convex 

 ai)ove; segments of equal length, only 10th half as long ; lateral spines short, on 

 segments 7 to 9 ; dorsal hooks forming rounded lobes on segments 2, and 7 to 9, 

 very little indicated on the others; a sear on each side of the segments and some 

 ill defined darker spots; part between the ventral sutures as broad as the lateral 

 ones; female genitals represented by two small brown knobs ; appendages about 

 twice as long as segment 10; triangular, sharp, laterals one-third shorter; legs 

 short, slender; joint three of posterior tarsus longer than the two basals together. 

 In the collection of Mr. McLachlan, England, is a nympha skin with 

 the just emerged imago from Newfoundland, labeled ; Terra Nova River, 



TRANS. AMER. KNT. SOC. XII. (.37) DECEMBER, I SS6. 



