214 PROCEEDINGS OF THE ACADEMY OF [Part II 



The two specimens here recorded show marked size diversity. 

 Length of body d" 41.5, 9 49; length of pronotum cT 11.3, 9 13.3; 

 width of pronotum (^ 16, 9 19.1, length of tegmen cT 40, 9 46; 

 width of tegmen cf 15.7, 9 18 mm. 



CORYDIINAE. 

 OULOPTERYX25 new genus. 



This genus of comparatively medium-small species is one of the 

 most distinctive found in tropical South America. 



Ocelli are absent, the pronotum is transversely strongly impressed 

 just before the cephalic margin, the pronotum and tegmina are 

 coriaceous and polished, thickly impresso-punctate, except distad 

 on the tegmina and very weakly to well supplied with hairs, the 

 wings are exceptionally large for the body bulk and have a large 

 appendicular field, which is not only folded but curled into a tight 

 roll when these organs are at rest, the ventral femoral margins are 

 unarmed except for a single distal spine on the ventro-cephalic mar- 

 gin of the cephalic femora, while pulvilli and arolia are absent. 



The curled tegmina show a further development of the type found 

 in the Ectobine genus Theganopter^yx. The more than usually 

 coriaceous tegmina, particularly in one species, gives to the species 

 a decidedly coleopteroid facies. 



Taking all of the characters into consideration the genus appears 

 to be an aberrant member of the Corydiinae, and we place it in 

 linear arrangement after Buhohlatta Hebard and before Ceuthobiella, 

 here described, though showing a development from a very different 

 stock. 



Genotype. — Oulopteryx meliponaruni new species.^^ 



Generic Description. Size medium small, form elongate elliptical. 

 Head slightly longer than broad, supplied with a few scattered 

 hairs, eyes well separated, ocelli absent, maxillary palpi rather short 

 and heavy. Pronotum shining, coriaceous, with cephalic margin 

 transverse, caudal margin very broadly and weakly convex, greatest 

 width meso-cauded; surface heavily impresso-punctate and very 

 weakly to well supplied with scattered hairs, with a strong trans- 

 verse impression before the cephalic margin, the discal section ir- 

 regularly bossed, the narrow lateral portion weakly reflexed. Teg- 

 mina fully developed in male, showing slight reduction in female, 

 shining, moderately to decidedly coriaceous, with apex rather sharp- 



^^ From ouXo-XTSpu^, in allusion to the curled wings. 

 ^^ Described on page 247. 



