Dilasia similis n. sp.

(Fig. 139)

Diagnosis: Characterized by the typical structure of pygophore and left paramere (see Discussion).

Description: Measurements, see Table IV. Male: Dorsal view: General coloration dark brown with extreme base of corion, small spot on inner margin of cuneal fracture, labium and legs paler. One specimen with pronotum and abdomen also pale. Dorsal setae medium-sized. Setae longer on pronotum and exocorion. Head: Smooth, prolonged anteriorly from base of antennae; eyes small, interocular space wide (Fig. 149); antennal segment II slightly thicker towards the apex and longer than head. Antennal segments (I:II:III:IV) 1: 3.1: 2.4: -. Thorax: Pronotum small, with lateral margins straight; their anterior margins rounded; posterior margin slightly concave; anterior lobe smooth, posterior lobe strongly rugose (Fig. 150). Mesosternum and metasternum not sulcate medially; the latter prolonged posteriorly (Fig. 155). Foretibiae armed with spines (Fig. 151); pads medium-sized (Fig. 152); forefemora unarmed; foretrochanters with short and thick spines (Fig. 153). Hemelytra smooth (Fig. 154). Abdomen: Hairs on dorsal surface short and restricted to outer margins; copulatory spines short and thick (Fig. 156). Genitalia: Prominence on pygophore beneath the paramere (Fig. 157). Aedeagus armed with two lateral and subapical feather-like structures. Left paramere long, straight, slightly widened subapically and apically rounded (Fig. 158). Female: Similar to male in coloration and dimensions. Antennal segments (I:II:III:IV) 1: 2.8: 2.7: 2.5.

Distribution: Peru. (Fig. 144).

Material examined: Holotype: PERU: ♀ Cusco, Pagoreni (at light), VII-2004, J. Williams, 72º54’07’’W – 11º42’22’’S. MACN; ♀ same data II-2004. MACN; ♂ same data (slide-mounted). MACN; ♂ Cusco, Nuevo Mundo, Base Pluspetrol, VII-2004, Williams, (at light), 78º08’30’’W – 11º33’02’’S. MACN; ♂ Ucayali, Kirigueti (at light), VII-2004, J. Williams, 73º07’08’’W – 11º38’13’’S. MACN.

Etymology: The specific name is given by having the external aspect similar to the new species crassicornis and gracilicornis .

Discussion: This species is similar to D. crassicornis and D. gracilicornis, but differs by having the left paramere straight, with outer margin straight to slightly concave, and apically not acute, as well as a longer prominence on pygophore beneath the paramere.