Alloblackburneus, Bordat, 2009

Dellacasa, Marco, Dellacasa, Giovanni & Gordon, Robert D., 2011, Systematic revision of the American taxa belonging to the genera Alloblackburneus Bordat, 2009, and Blackburneus Schmidt, 1913, with description of seven new species (Coleoptera: Scarabaeidae: Aphodiinae), Insecta Mundi 2011 (204), pp. 1-52 : 3-4

Key to species of Alloblackburneus

1. Afrotropical species .................................................................................................................... 13

— Nearctic and Neotropical species ................................................................................................. 2

2(1). Elytra surface glabrous, marginal setae may be present ............................................................ 3

— Elytra more or less diffusely pubescent, possibly restricted to lateral declivity ......................... 9

3(2). Elytra more or less strongly tapered toward apex ....................................................................... 4

— Elytraregularlyoblong ................................................................................................................ 6

4(3). Elytral interstriae alutaceous thus almost dull; pronotum with basal border more or less widely interruptedmedially, duallysomewhat irregularly punctured, punctures becoming progressively larger and coarser toward lateral margins. Pale brownish-red. Length 3.0- 4.5 mm. U.S.A. (Kansas, Oklahoma, Texas) .................................................................. A. cynomysi (Brown)

— Elytral interstriae shiny; pronotum with basal border thin but complete ................................. 5

5(4). Pronotum evenly veryfinelysparsely punctured throughout; epipleuralcarina elongately sparsely ciliate; superior apical spur of hind tibiae slender, almost straight and regularly acuminate; tarsal claws normally shaped; clypeus obtusely round at sides. Honey orreddish yellow. Length 3.0-4.0 mm. U.S.A. (South Carolina, Florida) ............................. A. troglodytes (Hubbard)

— Pronotum dually punctured, larger punctures on lateral third; epipleural carina glabrous; superior apical spur of hind tibiae inwardly abruptly curved, on lateral view spatulate; tarsal claws extremely elongate; clypeus angulate at sides. Chestnut brown. Length 4.0-5.0 mm. U.S.A. (from North Carolina to Florida) ..................................................... A. geomysi (Cartwright)

6(3). Elytralinterstriaestrongly convex. Pale reddish. Length 4.5-5.0 mm. Mexico (Aguascalientes, Jalisco, Nayarit) .................................................................... A. guadalajarae newspecies

— Elytral interstriae flat or faintly convex ..................................................................................... 7

7(6). Genae obtuse, feeblybutdistinctly protruding from the eyes; elytral striaesuperficially punctured, not crenulate; interstriae shiny, almost imperceptibly sparsely punctured; first segment of hind tarsi shorter than following three combined. Piceous, sometimes elytra brownish-red. Length 3.0- 4.5 mm. Mexico (Colima, Durango, Jalisco, México, Michoacán, Quintana-Roo , Sinaloa) ..................................................................................................... A. saylori (Hinton)

— Genae round, not protruding from the eyes ................................................................................ 8

8(7). Hind tibiae superior apical spur long as half of first tarsal segment; latter as long as following three combined; elytralstriae ratherdeeply punctured, feebly crenulate; interstriae subapically alutaceous thus weakly shiny. Pale reddish brown. Length 3.0- 4.5 mm. U.S.A. (Oklahoma, Texas, Utah) ....................................................................................... A. cavidomus (Brown)

— Hind tibiae superior apical spur as long as first tarsal segment; latter shorter than following three combined; elytral striae superficially punctured, faintly crenulate; interstriae entirely veryshiny. Darkchestnut brown. Length 3.5-4.0 mm. Mexico (Colima, Durango, Jalisco, México, Michoacán, Nuevo León) ....................................................... A. ibanezbernali newspecies

9(2). Elytra entirely pubescent .......................................................................................................... 10

— Elytra pubescent near lateral margins and on preapical declivity only ................................... 12

10(9). Pronotum glabrous, coarsely densely punctured on disc, lateral margins not fimbriate, genae feebly but distinctly protruding from the eyes. Reddish-brown; head and pronotum somewhat darker. Length 3.0- 4.5 mm. Canada (Ontario, Québec), U.S.A. (North Dakota, south to Georgia, Indiana, Kansas, Texas) ................................................................................ A. lentus (Horn)

— Pronotum pubescent either laterally or before hind angles, lateral margins fimbriate with rather elongate setae; genae not protruding from the eyes ............................................................... 11

11(10). Pronotum with patches of recumbent hairs before hind angles, lateral margins with edge not crenulate; elytralinterstriae superficially alutaceous thus rather shiny. Pale reddish, pronotal disc darker. Length 3.5-5.0 mm. U.S.A. (Louisiana, Nebraska, New Mexico, Texas) .............. ........................................................................................................... A. tenuistriatus (Horn)

— Pronotum withsome sparse erect setae towardlateral margins, latter withedge crenulate; elytral interstriae strongly alutaceous thus dull. Piceous; clypeal margin and pronotal sides reddish brown, elytra brownish. Length 3.0- 3.5 mm. U.S.A. (Florida, Georgia) .... A. fordi (Gordon)

12(9). Superior apical spur of hind tibiae short, spatulate and, in lateral view, with a broad concave surface on apical half; first segment of hind tarsi shorter than superior apical spur of tibia as well as following three segments combined. Reddish. Length 3.5-5.0 mm. Southern Canada, U.S.A. (from Michigan and Nebraska, south to northern Florida , westward to Colorado and eastern Texas), Mexico (San Luis Potosí, Tamaulipas). A. rubeolus (Palisot de Beauvois)

— Superior apicalspur ofhind tibiae elongate, narrowly spatulate and, in lateral view, verynarrowly concave on apical two thirds; first segment of hind tarsi almost as long as superior apical spur of tibiae and as long as following threesegments combined. Reddish, often elytra paler. Length 3.0- 4.5 mm. U.S.A. (from New Jersey to Florida) ................................... A. aegrotus (Horn)

13(1). Elytralinterstriaestrongly convex, the lateralones faintly pubescent; humeraltoothrather strong. Reddish brown, epistome, pronotal disc and sometimes elytra darkened. Length 2.5-3.5 mm. Zimbabwe.................................................................................................. A. acutulus Bordat

— Elytral interstriae very feebly convex, the lateral ones glabrous; humeraltooth faint. Pale reddish brown. Length 2.5-3.0 mm. Sub-Saharan Africa .................. [ A. mashunensis (Péringuey) ]