AMERICAN HKMIFTKRA 27 



Huinenil angles produced in a short, dentate and truncated lobe 1. 



Humeral angles prominent l)Ut oldique or rounded anteriorly, and minutely ser- 

 rated or unarmed 3 



1. Anterior tibite dilated toward their apex ; cheeks scarcely exceeding the tylus 



(a species not yet found within our limits) tiiipclula. 



Anterior tibiie scarcely dilated 2. 



2. Basal one half of each antennal joint pale I'oyei. 



Narrow base only of antennal joints pale arbor«»a. 



3. Lateral margin of the pronottim behind the sinus entire, unarmed ; befoie the 



the sinus rounded and calloused, smooth or obtusely dentate (Stal). 



my ops. 



Surface of the pronotum punctured to the edge along the latero-anterior 



margins 4. 



4. Cheeks distinctly longer than the tylus and contiguous or nearly so before its . 



apex, or generally leaving a deep narrow sinus; second joint of the 

 antennse shorter than the third; rostrum reaching on to the second 



ventral segment qiiatlripiistiilata. 



Cheeks e(|ualling or slightly exceeding the tylus, in tiie latter case with their 

 apices rounded and not approaching 5. 



5. Cheeks considerably produced before the apical sinus, their tips obtuse, sur- 



])assing the tylus but not contiguous before it ; second antennal joint 



nearly or quite as long as the third (J. 



Head shorter, truncated at apex; cheeks scarcely exceeding the apical sinus, 

 little longer than the tylus but sometimes contiguous over its depressed 

 apex ; second antennal joint distinctly shorter than the third 8. 



6. Ba.sal twojointsof the antennae rufous; latero-anterior marginsof the pronotum 



strongly dentate affiniK. 



Antennpe fuscous or black with the narrow base of the third and fouith jdints 

 pale 7 



7. Size medium; latero-anterior margins of the pronotum with but about three 



distinct teeth obsciira. c ^f 



Size large; latero-anterior margins of the pronotum closely set with strong 

 teeth; color cinerous with a few large black punctures, and nioie 

 numerous smaller nncolored ones carioNa. 



8. Latero-anterior margins of the [)ronotum armed with irregular teeth ; base of 



the pronotum and the elytra with many smooth white points; head 

 truncated before, the apical sinus almost obsolete; Iniccula- armed an- 

 teriorly with a small acute tooth Harriisii. 



Latero-anterior margins armed with numerous regular teeth; pronotum and 

 elytra without dots; bucculje with a large stout to(»th anteriorly. . . .9. 



9. Head before distinctly triangular, the subajiical lobes jirominent, obtuse ; elytra 



with a discal white point aiiniilata. — ■'?:>■ 



Head truncated, scarcely longer on the middle; white discal point on elytra 

 obsolete; size large liiargiiiellii. 



Broeliyinena arborea Say. 



This is a distinct and well-known form that is di.stributed over 

 nearly the whole of the United States and Canada, but seems to he 



TEANS. AM. ENT. SOC, XXX. FEBRUARY, 1904. 



