Canthochilum

Philips, Keith & Ivie, Michael A., 2008, Seven new species of Canthochilum Chapin from Hispaniola (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 1730, pp. 27-42 : 38

Key to the species of Canthochilum of Hispaniola

This key does not include an undescribed species reported by Matthews (1969) from the La Hotte region of southwestern Haiti, known only from a partial specimen. That species has a lateral elytral carina, coarse discal striae, shagreened and flattened elytra, and a unique aedeagus (see Matthews 1969, fig. 8).

1. Elytra evenly rounded laterally ( Fig. 43 ), without trace of lateral carina or angulate margin between sev- enth and eighth striae and just above elytral epipleura...............................................................................2

1'. Elytra with a lateral carina or relatively abruptly angulate margin ( Figs 44, 45 ) between seventh and eighth striae and just above elytral epipleura..............................................................................................4

2. Elytra bicolored, yellow-orange along anterior margin from humerus to second interstria, body length <3 mm ( Fig. 37 )............................................................................................................................. C. mimicum

2'. Elytra piceous, body length> 3.5 mm.........................................................................................................3

3. Head surface distinctly shagreened on anterior half and extending posteriorly at middle, remaining surface smooth and distinctly punctate ( Fig. 40 ) ..................................................................................... C. xericum

3'. Head surface smooth and lacking shagreening with very fine small scattered punctures ( Fig. 34 ).............. ........................................................................................................................................ C. brodzinskyorum

4. Clypeal margin with four teeth and an angulation at each clypeo-genal margin........................................ 5

4'. Clypeal margin with six teeth and an angulation at each clypeo-genal margin...........................................7

5. Eyes separated by a distance equal to 6 times their transverse width, total body length> 6 mm (but as small as 5 mm rarely) ( Fig. 38 ) ............................................................................................ C. nebulonemi

5'. Eyes separated by a distance equal to 3–4 times their transverse width, total body length <5.5 mm........6

6. Body black to dark brownish or reddish black, legs dark brownish grey, body length 3.0 – 4.2 mm ( Fig. 41 ) … ..................................................................................................................................... C. darlingtoni

6'. Body deep purplish black, legs and anterior edge of clypeus reddish brown, body length 4.0 – 5.5 mm ( Fig. 35 ) ..................................................................................................................................... C. magnum

7. Elytral intervals between striae convex apically, apical portion transversely carinate or subcarinate at apex in rear view ( Figs. 36 , 46)........................................................................................................ C. matthewsi

7'. Elytral intervals between striae flat apically, apical portion lacking distinct transverse ridge at apex in rear view (Fig. 47).............................................................................................................................................. 8

8. Metatibia, slightly, gradually widened in apical 1/2 ( Fig. 39 ) ................................................... C. ciboney

8'. Metatibia parallel-sided in basal 2/3, suddenly, distinctly widened in apical 1/3 ( Fig. 35 ) .. C. platycnemis

Figures

FIGURES 43 – 45. Elytral lateral angles (and part of pronotal base). 43. Evenly rounded (Canthochilum xericum); 44. Trace of angulate edge (Canthochilum nebulonemi); 45. Distinct angulate margin (Canthochilum matthewsi). FIGURES 46 – 47. Elytral apices. 46. Rounded intervals and transversely carinate or subcarinate (Canthochilum matthewsi); 47. Flat intervals and lacking distinct transverse ridge (Canthochilum ciboney).

FIGURES 34 – 37. Dorsal habiti. 34. Canthochilum brodzinskyorum; 35. Canthochilum magnum; 36. Canthochilum matthewsi; 37. Canthochilum mimicum.

FIGURES 38 – 40. Dorsal habiti. 38. Canthochilum nebulonemi; 39. Canthochilum ciboney; 40. Canthochilum xericum.

FIGURES 41 – 42. Dorsal habiti. 41. Canthochilum darlingtoni; 42. Canthochilum platycnemis.