TIeterugyiuL and Fossoiial Ilijmoioptcra. 265 



NYSSONID^. 



(G) ]. Front wings with only three submargiual cell'^. 



(:!) 2. Front wings with the 2nd submarginal cell not 



petiolated .. .. .. .. .. .. Ilaqiactus. 



(2) '•). Front wings with the 2ud submarginal cell 

 petiolated. 



(5) 4. 1st and '^nd submarginal cells each receiving a 



recurrent nervure . , .. .. .. .. Didiiwia. 



(-i) 5. 2nd submarginal csll receiving both recurrent 



nervures . . . . . . . . . . . . Nys!i07i. 



(1) C. Front wings with four submarginal cells, or at 

 least with the ith almf>st complete. 

 (10) 7. 2nd submarginal cell receiving both reccurrent 

 nervures. 



([>}. 8. -Ith submarginal cell incomplete ; median nerve 

 of hind wing becoming furcate bej'ond the pos- 

 terior transverse nerve . . . . . . . . Gorytes. 



(s) 9. ith submarginal cell complete ; median nerve of 

 hind wing becoming furcate before the origin of 

 the posterior transverse nerve . . . . . . Hoplisus. 



(7) 10. 1st and 3rd submarginal cells each receiving a 



recurrent nervure . . . . . . . . MclUnus. 



Harpactus, Jur. (PL VIIL fig. 31). 



Nouv. Metli. Hym. p. 124, pi. x. 20 =Ar2xictHs, Shuck., &c. 



I have had great doubts as to the natural position of 

 this genus and of the following, as they are so unlike the 

 rest of the forms with which any structural classification 

 seems to throw them, in colour and general appearance ; 

 however, I do not see any better position for them than 

 in the Nyssonidae, where F. Smith has placed them, and 

 I have accordingly followed his views. Harpactus may 

 be known at once from any of the other genera in the 

 family by having only three submarginal cells, and 

 the 2nd not petiolated ; the abdomen shining, and red 

 at the base. 



1. tumiduf!, Panz. Faun. Germ. 81, 15. 



Head and thorax black ; scape of the antennae, clypeiis, 

 and a spot on each side of the face, white ; scutellum 

 generally with a white central spot ; antennae in the <? 

 more or less piceous ; abdomen with the two basal 

 segments red, a small white spot at the side of the apical 

 margin of the 2nd segment, and a white spot on the 5th 

 at the base in the ? , or a white transverse line at its apex 

 in the c? ; the 6tli in the <? sometimes with a pale central 

 line ; these spots are all more or less liable to disappear ; 



