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228 Annals Entomological Society of America [Vol. XII, 



toward the tip. The callosity behind the eye, instead of being 

 wanting, as Stal states, is merely usually smooth without acute 

 points, although a few specimens of C. antennator from Kansas 

 and Nebraska are at hand in which this tubercle is distinctly 

 muricate. 



The following synopsis is based on specimens in the col- 

 lection of Dr. E. D. BaU, Mr. Wilham J. Gerhard, of Chicago; 

 Mr. H. G. Barber, Mr. Garl J. Drake, the Wisconsin Agricul- 

 tural Experiment Station, and the Milwaukee Museum, except 

 for C. armatiis and C. albiventris, for whose positions reliance 

 was placed on descriptions. The distribution of each species 

 is indicated in the synopsis for the sake of brevity. 



KEY TO THE SPECIES OF Chariestenis. 



a. Antennae dilated equally on both sides of third segment. 



b. Dilation of third antennal segment only three-tenths as wide as 

 long; legs and antennae ferrugineous; size 9 x 1.2 mm. (Antilles). 



gracilicorjiis Stal. 

 bb. Dilation of third antennal segment at least four-tenths as wide as 

 segment is long; legs and antennae black; body above brown, 

 below albo-farinaceous; length 11 mm. (Texas and Mexico). 



albiventris Burm. 

 aa. Antennae with third segment more angularly dilated on lower side; length 

 over 10 mm. 

 b. Lateral margins of pronotum armed with distinct tubercles in front 

 of humeri; first antennal segment armed with distinct acute 

 tubercles, larger near base. 

 c. Pronotum with expanded, elevated lobes at each lateral angle, 

 armed with four or five acute processes of similar size; head 

 with prominent, multispinose tubercle behind each eye. 



(California) balli n. sp. 



cc. Pronotal angles not expanded, armed with one large tooth 

 preceded by several smaller ones; head with tubercles behind 

 eye smooth or slightly muricate. (United States, east 



of the Rocky Mountains) antennator Fabr. 



bb. Lateral margins of pronotum unarmed in front of humeral spine; 



first antennal segment armed with acute tubercles at base only 



(or none); subtropical or tropical species. 



c. Body castaneous, margins and angles of pronotum darker; 



dilation of third antennal segment not notched; venter 



refescent; dorsum of abdomen rosaceous; spines of pronotum 



remarkably long and slender. (Texas to Panama). 



cuspidatus Dist. 

 cc. Body testaceous, pronotal margins concolorous with or paler 

 than disc; dilation of third antennal segment notched; venter 

 with black spots. 



d. Dorsum of abdomen black. (Mexico) moestus Burm. 



dd. Dorsum of abdomen subsanguineous, base and apex black. 



(South America) armatus Thunbg. 



