FOSSORES — NYSSONID^E. 1 1 7 



2.— Second submarsinal cell receiving the first recurrent nervure at about the 

 middle, and the second between the middle and apex ; first discoi- 

 dal cell very long and narrow, much longer than the first submar- 

 ginal cell ; submedian cell of posterior wings oblique or sinuate at 

 tip. 



Submedian cell of posterior wings as long or nearly as long as the median 

 cell on the externo-medial nervure; face generally broad, not nar- 

 rowed towards the clypeus. which is transverse; antennre inserted 

 near the base of the clypeus Gorytes Latr. 



Submedian cell of posterior wings longer than the median cell on the 

 externo-medial nervure ; face narrowed towards the cly])cus, which 

 is generally suhtriangular; antennse inserted higher up above the 



clypeus IIopIiNUS St. Farg. 



Second submarginal cell broad, receiving the second recurrent nervure very 

 near the tip, the first recurrent nervure uniting with the first trans- 

 verse cubital nervure ; first discoidal cell diamond shaped, broad in 

 the middle and not longer than the first submarginal cell on the 

 dividing nervure ; submedian cell of posterior wings much shorter 

 than median cell on the externo-medial nervure, truncate at tip ; 



abdomen subpetiolate, first segment nodose Euspoilgus St. Farg. 



3. — Abdomen subscssile ; prothorax subquadrate, narrower than the mesothorax ; 

 posterior femora with a stout tooth near the tip ; apical joint of % 



antennae crescent-shaped .- Alysoii Jur. 



Abdomen sessile ; prothorax transverse, as broad as the mesothorax. 



Three submarginal cells. 



Posterior tibiae serrate; lateral margin of scutellums strongly reflexed, 

 postscutellum bilobed ; apex of % abdomen generally with four 



teeth Parauyssoii Guer. 



Posterior tibise not serrate ; lateral margin of scutellums not reflexed, 

 postscutellum narrow, not bilobed ; apex of % abdomen with not 

 more than two teeth ]Sfyssoii Latr. 



Two submarginal cells Hyponysson Cress. 



The genera Gorytes aud Hoplims are closely allied, diilering prin- 

 cipally in the neuration of the posterior wings ; of the twenty-five 

 species which have been described under the former genus, fourteen 

 are known to belong to Hoplisus. 



Evf^pongns, a very distinct genus, is represented by a single species, 

 blpunctatus !^ay, a small insect of uncommon occurrence. 



The genus Alt/son, characterized by the subquadrate prothorax, 

 petiolate second submarginal cell aud toothed posterior femora, con- 

 tains three species, generally rare in collections. 



Of the remaining genera, Pamnysmn, which has two species from 

 Texas and the far Western States, differs chiefly by the serrate pos- 

 terior tibi;i3 and form of the scutcllum ; while Hiip())ii/.<'<oii, which 

 closely resembles Nij-i!<oii, ditiering only by having two submarginal 

 cells instead of three, is represented by a single species of small size 



