Onthophagus atriglabrus Howden and Gill, 1987

Sánchez-Hernández, Gibrán & GóMez, Benigno, 2018, First Precise Locality Data for Onthophagus atriglabrus Howden and Gill and New State Record for Onthophagus anewtoni Howden and Génier (Coleoptera: Scarabaeidae: Scarabaeinae) in Mexico, The Coleopterists Bulletin 72 (4), pp. 873-876 : 874

Onthophagus atriglabrus Howden and Gill, 1987 ( Figs. 1a , 2 )

Known Distribution. This species was described from Costa Rica and Panama, but it was also reported

in Colombia and Mexico without specific locality information (Howden and Gill 1987; Escobar 2000).

Examined Material. Five specimens (2 males, 3 females). MEXICO: CHIAPAS: Chiapa de Corzo municipality, 12.46 km NE of Chiapa de Corzo, disturbed oak forest, 16°42 ʹ 15.34 ʹʹ N, 92°53 ʹ 19.89 ʹʹ W, 1,085 m, 28.VII.2017, squid (26), pig dung (1♀) , fermented fungus (2♀), G. Sánchez-Hernández, E. Rodr´ıguez-López and J. A. Sánchez cols.

Comments. Howden and Gill (1987) reported that a “variety of subspecies” occurs in Mexico: “this form has the sides of the horn of the male with parallel sides and the pronotal tumosity with only lateral lobes; also the dorsal surfaces which are finely punctate in atriglabrus are more strongly punctate in the Mexican form”. Until now, the presence of this form in Mexico was not verified. Our record confirms the presence of O. atriglabrus in Mexico and provides the first precise locality data in the country, thereby expanding considerably its distribution range nearly 1,400 km northeast of its closest known locality. The extension in the distribution of this species is not uncommon, since, according to Halffter and Halffter (2009), some species of Central and South American origin, such as Canthon angustatus Harold, 1867 and Canthon lituratus (Germar, 1813) with recently documented distribution expansions that extend their distribution northward to southern Mexico, are now being found in Chiapas as their northern geographic limit.

Figures

Fig. 1. Dorsal habitus of a) Onthophagus atriglabrus and b) Onthophagus anewtoni.

Fig. 2. Currently known distributions of Onthophagus atriglabrus and Onthophagus anewtoni. Previously known locality records for O. atriglabrus are from Howden and Gill (1987) and Kohlmann and Sol´ıs (2001); those for O. anewtoni are from Howden and Génier (2004).