182 THE CANADIAN ENTOMOLOmST. 



tips. Seen from the side they are thickest at the base and are gradually thinned and 

 slightly declined to their truncate tips, beneath which are three or Four rows of minute 

 black denticles, extending more than half wiy to the base. Inferior appendage bifid 

 for nearly half its length, the branches slightly divergent, truncate R little obliquely on 

 tip, bent up at an angle with the declined basal portion, and bearing on each supero- 

 lateral margin a broad tjuadrangular elevation just before the obtuse apex. 



The appendages of the 2nd segment are very similar to thoSe of 0, carolns. 

 (See plate.) 



Two (^ s from Ithaca ill the Cornell University collection. One $ 

 collected by Mr. J. O. Martin, at Ithaca, June 7th, 1897. A handsome 

 species. 



The occurrence of a Hcrpetogomphus at Ithaca was quite unex- 

 pected. All other species of the genus are from the extreme west and 

 southwest. This one is related to H. elaps^ Selys, of Mexico. 



Ophiogoinphus Jolianiiiis, n sp. Male. — Wilmurt, N. V. 



Length, 43 mm.; abdomen, 30 ; hind wing, 26. 



Black and yellow. 



Labrum pale with a narrow brown margin which is broadened Isllerally. Face 

 yellow ; rear of frons and vertex except the rear black. Occiput yellow, its margin 

 ciliated with black. 



Thorax yellow, with thin brownish hairs ; a narrow middorsal fbScous stripe 

 subobsolete anteriorly, forking above with the carina to unite on either side with the 

 fused humeral and antehumeral stripes, which are separated by a narrow yellow line 

 only in their middle portion. Sides yellow, with an incomplete fuscous stripe on the 

 1st and a complete narrow one on the 2nd lateral sutures, and with fuscous markings 

 above the bases of the legs. 



Wings hyaline (immature). 



Legs fuscous ; front femora paler below. 



Abdomen IJack, marked with yellow as follows : Sides of segments i and 2, 

 except behind auricles ; two lateral spots on 2 to 7; sides of 8 and 9, except the itlferior 

 margin ; apical half of 10 ; a maculose middorsal line reduced to very narrow basal 

 spots on 5 to 8, wanting on 9, 



Superior appendages slightly longer than 10, yellowish, darker at the tip, cylindric, 

 moderately divaricate and equally narrowed in their apical fourth to an acute tip. Seen 

 from the side they are a little angulated near the base and beyond this point irregularly 

 denticulate beneath to a point just before the tip, where they are suddenly contracted 

 from below upward, leaving the point at the upper side. 



Inferior appendage bifid almost to its base, its branches straight, cylindric, about 

 as long as superiors and twice as stout, almost as divergent, each apparently forked 

 by reason of a very large external upturned tooth at two-fifths of its length ; at the 

 extreme apex another stout upturned tooth. (For genital hamules see plate.) 



A single $ , with its cast skin, from Wjlmurt, N. Y-, in the Cornell 

 University collection, 



