468 PROCEEDINGS OF THE ACADEMY OF [DeC, 



3. Veins of the clavus not attaining the apex, but united with the- 



commissural margin before the apex, 4, 



— . Veins of the clavus either continued to the apex or united with the 

 claval suture before the apex, 5. 



4. Apex of the front without an ocellus; elytra reticulated toward 



their apex, 2, DICTYOPHARIDA. 



— . Apex of the front usually with a third ocellus ; elytra not reticulated 

 apicahy, ' . . 5, CIXIIDA. 



5. Elytra ample, held vertical with the costal margin meeting below 



the abdomen, closely reticulated over the whole surface; the 

 costal and apical margins without transverse veins; front con- 

 tinued over on to the superior aspect of the head without a 



transverse carina, 7, ACANALONIIDA. 



— . Elytra when broad held more horizontal, not meeting below 

 nor closely reticulated over the whole surface, and the front 

 usually distinguished from the vertex by a transverse carina at 

 the apex of the head, 6. 



Head broad, with the eyes nearly or quite as wide as the mesono- 

 tum ; pronotum without cariniie or with a median carina only, 7. 



Head usually much narrower than the mesonotum ; if as wide the 

 pronotum emarginate behind and tricarinate, .... 8. 



Pronotum truncated behind or at most with a shallow rounded 

 sinus, 6, ISSIDA. 



Pronotum angulately emarginate behind, . 9, RICANIIDA. 



Elytra distinctly ampliated within and overlapping beyond the 

 apex of the clavus, 4, ACHILIDA. 



Elytra not ampliated within nor overlapping at apex, ... 9. 



Elytral membrane strongly differentiated from the corium with 

 numerous simple longitudinal nervures, 3, TROPIDUCHIDA. 

 — . Elytral venation simple, without a distinct closely veined mem- 

 brane; pronotum very short, deeply angularly emarginate 

 behind, 10, DERBIDA. 



Subfamily FULGORIDA Stal. 



This subfamily is largely tropical in its distribution; but four genera 

 and five species have thus far been reported from our territory. Doubt- 

 less, however, many of the subtropical forms inhabiting Mexico and the 

 West Indies extend their range across our southern border and must 

 eventually be included in our faunal lists. 



Subfamily DICTYOPHARIDA Stal. 



This subfamily is better represented in our fauna than the preceding; 

 the large genus Scolops being almost precinctive. Our genera may be 

 distinguished as follows : 



Elytra as long as the abdomen or longer, 1. 



Elytra much abbreviated, not attaining the middle of the abdomen, 5. 



