BUFFALO SOCIETY OF NATURAL SCIENCES 93 



i. Cyrtolobus (Atymna) simplex n. sp. PI. 2 fig. 13. 



Large and elongated, somewhat intermediate in form between arcna- 

 tus and the more typical forms of Atymna. In a measure recalling Anti- 

 anthe. Pronotum well elevated; dorsal outline regularly arcuated from the 

 base to the apex of the abdomen, there slightly angled and running thence 

 nearly straight to the apex which attains the middle of the terminal areole; 

 its highest point just behind the humeri. Whole surface pale yellowish 

 testaceous, perhaps green in life, coarsely and evenly punctured, the punc- 

 tures a little darker but not fuscous; dorsal carina black, serrated with pale 

 below. Face more obscurely punctured; margins of the cheeks almost rect- 

 ilinear; clypeus and lorae fused, their basal suture distinct and almost acutely 

 angled. Clypeus broad, rounded at apex, strongly incurved. Base of the 

 metopidium with a ferruginous mark above each eye. Last ventral segment 

 longer than usual. Length 8 mm. 



Described from two females from Arizona in the Cornell 

 University collection. This insect suggests a transition to Ar- 

 chasia and AntiantJie but it is much less elevated and is too at- 

 tenuated posteriorly to be placed in those genera. 



2. Cyrtolobus (Atymna) castaneas Pitch. 



This species is common and widely distributed in the 

 eastern United States and Canada but of its western distribution 

 I have little knowledge. It varies from a deep piceous black 

 with a pale marginal line {nigricephala Emmons) to a uniform 

 green (viridis Emmons. ) So far as I know it occurs only on 

 the chestnut. It is the type of subgenus Atymna. 



3. Cyrtolobus (Atymna) querci Fitch. 



Lives on oak and has probably about the same geographical 

 distribution as the preceding. The males are easily recognized 

 by their black color marked with a broad dorsal pale vitta which 

 generally is interrupted before its apex. The females are very 

 close to inornata Say but may be distinguished by the more 

 coarsely punctured and less polished surface and the flatter and 

 more uneven face with the clypeus narrower and distinctly pro- 

 duced and incurved at apex. The dorsum also is slightly less 

 elevated. 



4 Cyrtolobus (Atymna) inornata Say. 



In this species the males are colored green like the females 



but they are smaller and have the dorsum rather less elevated. 



The polished finely punctured surface and the rounded polished 



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