REVISION OF THE GENUS COPROPORUS — BLACKWELDER 3 



4. Pronotum and elytra strigulose inflatus 



Pronotum and elytra not strigulose 5 



5. Elytra with a distinct concavity at sides 6 



Elytra at most flattened at sides 7 



6. Elytra distinctly punctate on disk nitilus 



Elytra not punctate on disk or very minutely and irregularly so laevis 



7. Elytra distinctly punctate on disk sparsus 



Elytra not punctate on disk or very minutely so arizonae 



COPROPORUS VENTRICULUS (Say) 



1834. Tachyporus ventricuhis Say, Trans. Amer. Philos. Soc, vol. 4, p. 466. 

 3837. Tachyporus acuductus Kieby, Fauna Boreali-Americana, vol. 4, p. 90. 

 1837. Tachyporus affinis Kirby, Fauna Boreali-Americana, vol. 4, p. 91. (Not 

 Sharp, 1883.) 



1839. Tachinus giMulus Eeichson, Genera et species staphylinorum . . . , p. 252. 



1840. Tachinus ventriculus (Say), Erichson, Genera et species staphylino- 



rum . . . , p. 920. 

 1846. Tachyporus punctulatus Melsheimeb, Proc. Acad. Nat. Sci. Philadelphia, 



vol. 2, p. 32. 

 1859. Coproporus ventricuhis (Say), LeConte, The complete writings of Thomas 



Say . . . , vol. 2, p. 583. 

 1877. Erchomus ventriculus (Say), Horn, Trans. Amer. Ent. Soc, vol. 6, p. 108. 

 1877. Erchomus acuductus (Kirby), Horn, Trans. Amer. Ent. Soc, vol. 6, p. 126. 

 1877. Erchomus affinis (Kirby), Horn, Trans. Amer. Ent. Soc, vol. 6, p. 126. 

 1877. Erchomus gibbulus (Erichson), Horn, Trans. Amer. Ent. Soc, vol. 6, 



p. 126. 

 1877. Erchomus punctulatus (Melsheimer), Horn, Trans. Amer. Ent. Soc, vol. 6, 



p. 126. 

 1884. Erchomus flavidus Casey, Contributions to the coleopterology of North 



America, pt. 2, p. 141. 

 1915. Erchomus politus Manee, Ent. News, vol. 26, p. 175. (Not Sharp, 1876.) 



Color piceous; antennae, trophi, prosternum, and legs testaceous; 

 frequently paler in great part. Head obtrapezoidal, abruptly trun- 

 cated and declivous in front of the eyes ; surface above not distinctly 

 punctulate but extremely minutely wrinkled, shining; gula wide 

 but somewhat narrowed at middle, slightly elevated and convex. 

 Antennae short, gradually expanding, segments 6-11 transverse, 

 eleventh subequal to ninth and tenth together. Maxillary palpi 

 short, stout; fourth segment longer than third but less thick and 

 feebly tapering. Pronotum shining, minutely and irregularly punc- 

 tulate. Mesosternum feebly carinate posteriorly, minutely strigulose. 

 Surface of elytra uneven, distinctly punctate; with a broad con- 

 cavity along the lateral margin; epipleurae inflexed against inner 

 face of elytra. Abdomen feebly margined; the feeble punctures in- 

 distinct because of the minute reticulations, above and beneath. 

 Eighth tergite of male 4-lobed, lobes triangular, median pair a little 

 longer; eighth sternite broadly semicircularly notched, this and the 

 three preceding segments flattened at middle throughout their length. 



