Orizabus isodonoides Fairmaire, 1878

Warner, William B., 2011, Review of the genus Orizabus Fairmaire in the United States of America (Coleoptera: Scarabaeidae: Dynastinae), Insecta Mundi 2011 (174), pp. 1-42 : 13

Orizabus isodonoides Fairmaire

Fig. 7 , 18, 19 , 23, 24

Orizabus isodonoides Fairmaire 1878: 263 ; Horn 1885: 125, Endrödi 1969: 86, 1985: 244,

Morón 1981: 135, Delgado and Deloya 1990: 305, Morón et al. 2003: 7, Delgado 2008:56, Ratcliffe and Cave 2010: 1. Type. Lectotype male (MNHN) here designated; labeled “Toluca [T] // Type [T] // Orizabus isodonoides Fair. [H] // Mexico / Salle coll. [T] // Orizabus / isodonoides / apud Sallé Fairm.[H] // H.W.Bates / Biol. Cent. Amer.[T] // museum Paris / ex coll. / R. Oberthur[T, blue label] // syntype [T, red label] // LECTOTYPE [T] / Orizabus / isodonoides / Fairmaire / des. W. B. Warner[H, red label]”. Fairmaire apparently described this species from a series of specimens based on the measurements he gave (“—Long. 14 à 16 mill.”); however, the lectotype is the only syntype I examined.

Cheiroplatys isodonoides, Bates 1888: 322 , Fall 1905: 272, Saylor 1946: 18.

Orizabus (Aztecalius) isodonoides, Casey 1915: 228 .

Remarks. Saylor’s (1946) record of Orizabus isodonoides Fairmaire from Colorado is suspect, and so is not included in the key above. I have not been able to locate this specimen in the USNM nor in the Saylor material at CASC, and do not believe the species occurs north of Mexico. Because Saylor based the record on a single female, and specifically mentioned “the two large and entire clypeal carinae are distinctive,” it is probable that he misidentified a specimen of O. mcclevei (e.g. compare Fig. 15 and 19 ), or a worn specimen of O. pyriformis . If O. isodonoides does indeed occur in the US, it can be told from other species by its distinct, transverse frontoclypeal carina (instead of tubercle) even in fresh specimens ( Fig. 7 ), uni- or bisinuate dorsal margins of the male protibiae (tibiae with two or three weak lobes), different pronotal shape ( Fig. 18, 19 ), broader, subovate (in apical view) antennal lamellae, and in males (all but the very smallest individuals), a noticeable anteromedial pronotal tubercle that is separate from the anterior marginal bead ( Fig. 7 , 18 ), as well as the paramera ( Fig. 23, 24 ). The anterior marginal bead is not angularly wider at the middle, and in males (and some females) a broad depression is usually evident behind the pronotal tubercle.

Figures

Figures 5-7. Dorsal views of head and anterior third of pronotum (males): 5) O. mcclevei holotype. 6) O. pyriformis (Texas). 7) O. isodonoides.

Figures 16-19. Dorsal habitus: 16) O. pyriformis male. 17) O. pyriformis female. 18) O. isodonoides male. 19) O. isodonoides female.

Figures 20-25. Dorsal and lateral views of paramera: 20-21) O. mcclevei holotype. 22) O. pinalicus holotype. 23- 24) O. isodonoides. 25) O. rubricollis.

Figures 12-15. Dorsal habitus: 12) O. pinalicus holotype. 13) O. pinalicus allotype. 14) O. mcclevei holotype. 15) O. mcclevei allotype.