264 H. A. HAGEN. 



tucky ; nevertheless the full i^rown ones are so much lon<rer, broader 

 and flatter, that they may belong to another related species. 



17. Oouiphu»$ spec. 



Selys Monogr. Gomphin. p. 125. 



One nympha, perhaps nearly full urown, from Delphi. Ind., by Rev. 

 Hill. Length '.'A) mm. 



Very similar to G. adelphus ,- differs as follows: palpus narrower, the tip is a 

 very sharp bent hook, inside with ten strong teeth from base to tip; middle third 

 of mask straight; wing cases covering half of 4th segment; abdomen a little nar- 

 rower, more slowly tapering; segment 9 a little longer, narrower on tip, three 

 times longer than 10th ; lateral spines on 6 to 9 longer, sharper, the last about as 

 long as segment 10; lateral margins of 7th to 9th serrate; dorsal hooks well 

 marked on segments 2 to 9 somewhat less elevated, but more sharply pointed ; 

 genitals not marked; appendages as long as last segment, laterals shorter; legs 

 similar. 



Though there is no proof I think the nympha may belong to G. fra- 

 ternus, or perhaps to some nearly related species. 



18. GomphuN Orasliiiellus (supposition). 

 Walsh. Proc. Ac. Phila. 1862, p. 394. 



One female nympha skin from Loon Lake, Colville Valley, Washing- 

 ton Territory, July 2ii, 1882, by Mr. S. Henshaw. Length 30 mm. 



Body flat, little hairy ; liead cordate, notched behind, angles globular, rounded ; 

 only the two basal joints of antennae present ; mask quadrangular, one-third lon- 

 ger than broad, channeled below, basal third narrowed; middle third produced in 

 a short rounded lobe, with a comb of flat scales; palpus short, broad, on tip a 

 sharp, end hook, below finely dentated to base; wing cases covering half of 4th 

 segment; abdomen flat, less than three times longer than broad, the last five seg- 

 ments slowly tapering; segments of equal length, 9th a little longer, lOth half as 

 long as 9th, conical; lateral spines on 7lh to 9th; lateral margins of 8th and 9th 

 serrated ; dorsal hook on 4th to 9th well developed ; scars as usual, genitals marked ; 

 appendages about as long as 10th segment, pyramidal, sharp, laterals a little 

 shorter; legs strong, for burrowing ; hind legs flat, long, reaching about 2d seg- 

 ment; tarsi wanting. 



This nympha and one female of the imago were found in the same 

 locality ; no other Gomphus was found there ; so the supposition seems 

 to me warranted. 



A number of young nympha, 10 to 25 mm. long, from shallow water 

 North shore Cedar Lake, Illinois, Oct. 18, 1882, communicated by Prof. 

 Forbes, belong to this species described by Mr. Walsh from Illinois; 

 they agree perfectly with the nympha from Wjishington Territory. The 

 third joint of antennaj twice as long as the basals together, stout, cylin- 

 drical, a little thicker before tip ; fourth joint a short pyramid ; the 

 lateral spines and the dorsal hooks well developed; lateral margins of 

 segments 8 to 9 strongly serrated, and some teeth also on Tti) ; third 



