62 STUDIES IN NORTH AMERICAN MEMHRACID.E 



-. Crest narrowing above to a rounded point, hind angle 

 scarcely if at all indicated, its front sloping from the 

 metopidium without a sinus at the anterior base, 



2, pyramidata Uhl 



2. Anterior margin of the crest sloping to the front of the 



metopidium, without an obvious sinus at its anterior 

 base, 3. 



Crest nearly vertical before or sometimes overhanging, 9. 



3. Crest if elevated more or less rounded or pointed at apex, 



4- 



-. Crest elevated, square or nearly so at apex but appearing 

 tilted backward by the long slope of the anterior margin, 



7- 



4. Crest more or less conical, rounded or pointed at apex, 5. 

 Crest scarcely elevated, very broad, straight or very feebly 



rounded above, 6. 



5. Crest about as high as its breadth at base, rounded at apex, 



posterior sinus of crest with a lenticular pale vitta, 



3, barbata V. D. 



Crest a mere obtusely conical hump, broadly rounded or 

 very slightly angled above, 4, viridia Ball 



6. Crest obviously raised, rectilinear and horizontal above, 



right angled behind; color pale yellowish or whitish, 

 figured with darker, 6, Westcotti Godg. 



Crest broadly rounded above, scarcely raised above the 

 pronotum ; color grey, marbled with darker, 



5, obsoleta Ball. 



7. Color greenish grey, irrorated with paler, with a pale vitta 



on the posterior margin of the crest, 9, qiterci Fb. 



Color yellowish or greenish testaceous, marked with a 

 brown vitta, 8. 



8. Crest strongly sloping before, its apex usually rounded ; 



scarcely longer than high, 7, rcclivata Fh. 



Crest lower, its width twice its height, nearly rectilinear 

 above with the anterior angle rounded, humeral angles 

 more acute, ?, compacta Ball. 



