Scaphisoma

Fierros-López, Hugo Eduardo, 2006, Four new species of Scaphisoma Leach with maculate elytra (Coleoptera: Staphylinidae: Scaphidiinae) from Mexico, with new records and comments on S. balteatum Matthews, Zootaxa 1279, pp. 53-68 : 67

Key to the Mexican species of Scaphisoma with maculated elytra

1 Mesocoxal lines parallel ( Figs. 3 b, c); elytra with yellow apex ................................... 2

­ Mesocoxal lines parabolic ( Figs. 3 a, d); elytra with red or reddish brown apex .......... 3

2 Metacoxal lines sinuate ( Fig. 3 d); pronotum reddish orange; parameres with preapical cavity; internal sac with flagellum loosely coiled in the median lobe and bearing small asperities ( Figs. 4 j–l) .................................................... Scaphisoma versicolor sp. nov.

­ Metacoxal lines parallel ( Fig. 3 a); pronotum dark brown or black; parameres without preapical modification; internal sac with flagellum closely coiled and striate ( Figs. 4 a–c) ............................................................................ Scaphisoma jaliscanum sp. nov.

3 Metacoxal line convex ( Fig. 3 b); central area of pronotum with with black macula; aedeagus with symmetrical median lobe, which has lateral subapical projections ( Figs. 4 d–f) ...................................................................... Scaphisoma cortesaguilari sp. nov.

­ Metacoxal lines sinuate ( Fig. 3 c); pronotum uniformly colored; aedeagus with other characters ...................................................................................................................... 4

4 Pronotum black; ventrites dark brown; humeral area of elytra with black or brown macula ( Fig. 1 c); Aedeagus with asymmetrical median lobe, in dorsal view curved to the left ( Fig. 4 g) ............................................................... Scaphisoma opochtli sp. nov.

­ Pronotum orange­red; ventrites reddish; humeral area of elytra red; aedeagus with symmetrical, straight and apically pointed median lobe ( Fig. 4 m) ................................ .................................................................................... Scaphisoma balteatum Matthews

Figures

FIGURE 1. Habitus drawings of Scaphisoma. a) S. jaliscanum sp. nov.; b) S. cortesaguilari sp. nov.; c) S. opochtli sp. nov.; d) S. versicolor sp. nov. (all holotypes). Scale bar 1 mm.

FIGURE 3. Thorax of Scaphisoma, ventral view showing meso and metacoxal lines (other punctures are omitted). a) S. jaliscanum sp. nov.; b) S. cortesaguilari sp. nov.; c) S. opochtli sp. nov.; d) S. versicolor sp. nov. Scale bar 1 mm.

FIGURE 4. Aedeagi of Scaphisoma, dorsal, ventral and lateral views respectively. a – c) S. jaliscanum sp. nov.; d – f) S. cortesaguilari sp. nov.; g – i) S. opochtli sp. nov.; j – l) S. versicolor sp. nov.; m – o) S. balteatum Matthews. Scale bar 0.5 mm.