Biological Papers. 133 



SUBFAMILIES OF ACOCEPHALID^. 

 A. Frontal suture arising or directed between the ocelli ( plate II, fig. 4),0i or the ocelli placed 

 superiorly near anterior margin of vertex. Pronotum usually with a lateral carina. 

 Clypeus with margins parallel or strictly subparallel (except in Platynietopius). 



ACOCEPHALINiE 



AA. Frontal suture arising diiectly beneath ocellus or between ocellus and eye (plate I, fig. 2). 

 Ocelli on anterior margin of vertex before the eye. Pronotum rarely with a lateral carina. 

 Clypeus parallel margined or not Athysanin^e 



GENERA OF ACOCEPHALIN^. 

 A. Ocelli either placed superiorly near anterior margin of vertex or on the anterior margin 

 with the profile of face and vertex broadly rounded. Elytra longer than abdomen. Claval 



suture not distinctly curved at tip Acocevhalini 



B. Vertex not rectangular, including distinctly less than two-thirds the length of 

 the pronotum. Clavus not punctate-striate. 



C. Ocelli superior. Front broad, flat. Size medium or rather small. 



D. Extreme tip of elytron at center of elytron. Vertex with strise 

 parallel to anterior margin Slrongj/locephalus 



DD. Extreme tip of elytron distinctly above center of elytron. Ante- 

 rior margin of vertex not striate Acocephaliis 



CC. Ocelli on obtuse, rounded margin of vertex and margined with pale. 

 Front swollen, very convex. Size very small. 



Xestocephalus (Plate II, figs. 10 and 11.) 



BE. Vertex rectangular, including two-thirds the length of the pronotum. Clavus 

 strongly punctate-striate Goniagnathus ( Plate II, figs. 12 and 13.) 



A A. Ocelli before middle of eye on anterior margin of vertex, Profile of face and vertex 

 usually acute and never broadly rounded. Eyes without an antennal emargination. 

 Elytra often shorter than abdomen. Claval suture curved at extreme tip Dorydxni 



B. Vertex and face in profile not separated by a thin margin or by a line beneath 

 the anterior margin of vertex. Lateral carina of pronotum distinctly oblique. @ 



Memnonia (Plate II, figs. 5 and 6.) 



BB. Vertex and face in profile, separated either by a thin margin or by a pigment line 

 beneath anterior margin of vertex. 



C, Vertex rarely acutely angled, but broad, 'Hgulate, or roundingly produced. 

 Clypeus not expanded at apex. Front usually distinctly less than three 

 times as long as its middle breadth. 



D. Without pigment lines in cells of elytra. 



E. Vertex with a median carina. Claval veins' united pos- 

 teriorly. 



F. Vertex usually ligulate; at least twice as long as 

 broad. Pronotum without a distinct median 

 carina Dorycephalus 



FF. Vertex bluntly conical; less than twice as long as 

 broad. ': Pronotum with a distinct mediam 

 carina. Color black, Neoslossonia (Plate II, fig. 7.) 



. EE. Vertex without a median carina. Claval veins not united 

 posteriorly, but running separately to the margin of 

 elytron (except in Spanbergiella) . 



F. With but one claval vein. Vertex and pronotum 

 bearing converging red stripes. 



Spanbergiella (Plate II, figs. 3 and 4.) 



6. Be careful not to mistake a color line curving inward below the ocellus for the frontal 

 suture. 



7. In forms under BB, likely to be confusing because of the character of the profile, the 

 lateral carina of pronotum is distinctly horizontal. 



8. Only the male of Neosloaaonia is known. The female may more closely resemble Doryce- 

 Vhalus in the character of the vertex. 



