Key to the Subgenera of Cremastocheilus

This key to the subgenera of Cremastocheilus is based on: [[Media:Potts 1945 key to species cremastocheilini.pdf|Potts, R.W.L. 1945. A key to the species of Cremastocheilini of North American and Mexico (Coleoptera: Scarabaeidae). Bull. Brooklyn Ent. Soc. 40: 72-78.]] and [[Media:Cazier, 1938.pdf|Cazier, M.A. 1938. A generic revision of the North American Cremastocheilini with description of a new species (Coleoptera, Scarabaeidae). Bull. Southern California Acad. Sci, vol 37, pp. 80-87. PDF]]

You may also be interested in: [[Media:Krikken 1981.pdf|Krikken, J. 1982. North American myrmecophilous beetles of the genus Cremastocheilus: discussion of their classification and a review of the subgenera Trinodia and Anatrinodia (Coleoptera: Cetoniidae). Proceedings of the Koninklijke Nederlandse Academie van Wetenschappen. Series C. p. 509-526.]] and [[Media:Mynhardt & Wenzel 2010.pdf|Mynhardt, G. & J.W. Wenzel 2010. Phylogentic analysis of the myrmecophilous Cremastocheilus Knoch (Coleoptera, Scarabaeidae, Cetoniinae), based on external adult morphology. ZooKeys 34: 129-140.]]

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 * Anterior tarsi with 4th and 5th segments dilated (Fig. 1); head with distinct lateral carina above each eye (Fig. 2 and 3)..Macropodina.


 * Anterior tarsi with 4th and 5th segments not dilated; head lacking a lateral carina above each eye. . . . . . 2

2
return to couplet #1
 * Posterior angles of pronotum with inner margin raised and extending forward onto disc, dividing pronotum longitudinally into 3 unequal parts (Fig. ); clypeus with a well developed median carina (Fig. ); anterior angles of pronotum with a deep incisure, formaing an auriculate lobe (Fig. ). . . . . Trinodia
 * Posterior angles with inner margins not dividing pronotum into 3 parts; clypeus without well developed median carina; anterior angles without an auriculate lobe in front . . . . . 3

3
return to couplet #2
 * Menum entire at base, rounded to prominently angulate; posterior angles of pronotum continuous with pronotal disc; anterior angles of pronotum not nodular (Fig. ) . . . . . Myrmecotonus
 * Mentum not entire at base with posterior margin slightly to deeply notched (Fig. ); posterior angles retracted below level of pronotal disc; anterior angles nodular (Fig. ) ... Cremastocheilus