8(56 ZOOLOGY— INSECTS. 



Posterior femora not extending to the tip of the abdomen. Antenna; slightly 

 narrowed at the apex, extending beyond the tip of the pronotnm. Genital 

 segment of the male elongate and acuminate. 



MERMIRIA, Stal. 



This new genus is introduced here, and the description copied from 

 the Recensio, as the single species described under it is the one to which 

 Stal is disposed to refer Opomala bivittata. 



Generic characters. — Posterior tibia? armed with numerous spines ; 

 those on the exterior margin numbering from eighteen to twenty-two. 

 Head ecpial to, or but little shorter than, the pronotum ; fastigium prominent ; 

 the frontal tempora (lateral foveola?, or spaces of the vertex) not or but 

 obsoletely separated. Base of the very obtuse (subtruncate) anterior lobe 

 not shorter than the posterior. Elytra and wings not so long, or but slightly 

 passing the apex of the abdomen ; apex rounded. Frontal costa fiat ; mar- 

 gins sometimes subcallous. Antenna? ensiform ; prosternal tubercle obtuse, 

 distinct, strongly elevated in the middle ; eyes shorter than the portion of 

 the cheeks below them. 



MERMIRIA BELFRAGII, Stal. 

 Mermiria Belfragii, Stal, Receus. Orthop., 1873, 102. 



Pale olive-green. Head greenish-white ; median carina of the prono- 

 tum and an interior vitta of the lateral lobes fuscous ; the lateral carina? 

 pale. Elytra griseo-hyaline, greenish externally and yellow-veined inter- 

 nally ; anal and axillary veins pale. Wings near the base pale greenish- 

 yellow, near the apex fnscous-veined. Spines of the posterior tibia? black 

 at the tips. 



$ . — Length, 44 millimeters. Texas. 



A vitta on the cheeks behind the eyes pale fuscous ; two olive-green 

 lines on the vertex ; fastigium narrow in front, rounded at the apex, slightly 

 impressed near the margins, shorter than the eyes. The portion of the 

 cheeks below the eyes somewhat longer than the eyes. Face obsoletely 

 and frontal costa distinctly punctate. Antenna? broadly ensiform, some- 

 what narrowed at the apex, as long as the head and pronotum. Pronotum, 

 or the dorsum, slightly convex transversely ; lateral margins parallel ; the 



