NORTH AMERICAN IIOMOPTKRA. 299 



B. Elytra witli two transverse nervures between the first and second sectors. 



ParaiiieMiiN. 

 — . Klytra witli but one transverse iiervure between the first and second sec- 

 tors (Ci 



C. Frontal suture extending only to tlie antennal pit. HecalllS. 



— . Frontal suture continued to the ocelli on the acute anterior edge of the 



bead, vertex shorter Parabolocratiis.* 



Tribe DELTOCEPHALINI. 



Vertex flat, more or less strongly, angularly jiroduced, meeting the front in a 

 right angle or less (A). 



Vertex short, more or less convex and sloping, not strongly, though sometimes 

 obviously angled before, anterior edge rounded or obtuse, rarely meeting 

 the front in less than a right angle, in which case the elytra are fur- 

 nished with supernumerary transverse veinlets in the costal areole and 

 along the claval suture (B). 



A. Vertex strongly produced and acutely angled before ; front long and nar- 



row Platymetopiiis. 



— . Vertex rarely, if ever more than right angled before : front less than twice 

 as long as broad Delloeephalus. 



B. Anterior edge of the vertex generally obtuse, sometimes quite sharply an- 



gled ; elytra with a number of supernumerary transverse veinlets. 

 mostly along the costa and claval suture, and more or less closely re- 

 ticulated with brown pigment lines on the discal areoles Allygu!^. 



— . Vertex short, rounded almost from the base, but little longer on the middle 

 than next the eye, front very broad, clypeus constricted near its base. 



Ciiouiagiiathii«i. 



Tribe ATHYSANINI. 



Elytra short, without an appendix, rarely exceeding the abdomen in length : 

 front broad, width at the ocelli and the length equal, or the former the 

 greater: vertex convex, more or less angled before, or proniinent and 

 tumid, with the apex and edge rounded AlliyMaiiiis. 



Elytra longer, sometimes considerably longer than the abdomen, valvule, with 

 an appendix, or narrowed to an acute point at apes (Aj. 



A. Elytra normal, hut moderately, if at all narrowed toward the apex, with a 



distinct appendix (B). 



— . Elytra strongly narrowed to an acute point at the apex of the second apical 

 areole. appendix wanting Aciiiopferus. 



B. Vertex flat and produced, strongly angled before, generally marked with 



concentric bands on or below the sharp anterior edge, lengih at the 

 middle at least one and a half times that next the ej'e; outer antiapical 

 areole of the elytra narrowed to a point at apex or striate, the post- 

 nodal generally crossed by one or more arcuated veinlets, which, with 

 the stigmatal and one or two first apical veinlets are strongly recurved 

 to the costa, antennal setae elongated Kcaplioideus. 



* I have been unable to include genus Spanhergiella Sign, as it is unknown to 

 me in nature, and I do not possess that part of Signoret's •' Essai" containing its 

 characters. Mr. Uhler places it near i/ecti/us Stal. to which it must be closely 

 related. 



TRANS. AM. ENT. SOC. XIX. DECEMRKK. l-!f,'. 



