b) Species-group: monoargenteus .

Ten species: C. barbara sp. nov., C. denise sp. nov., C. elyana sp. nov., C. jane sp. nov., C. mariana sp. nov., C. monoargenteus, C. regina sp. nov., C. stigmatica, C. tessellata, and C. ybyra .

The male genitalia in this species-group show great similarity among species, particularly the everted phallus with two dorso-lateral and single meso-ventral diverticula—which defines the species-group (Pl. 19: Figs 4–13). The species-group is also distinguished by: i) male sternite VIII uniformly sclerotised, with an obtuse posterior margin that is V-shaped with exception of C. stigmatica that is acute, ii) tegumen extended beyond articulation with saccus, being rectangular and slightly curved; iii) posterior margin of saccus with or without mesal protrusion; iv) tergal lobes flattened or projected, each side crab claw-shaped; v) pseudotegumen expanded mesally and ribbed; vi) valvae digitiform and ribbed, and; vii) plates of lamella antevaginalis with mesal corners projected and tapered.

Distribution. Coastal and mainland between Minas Gerais in southeastern Brazil and Rio Grande do Sul in southern Brazil at altitudes between about 500 and 2000 m. The distribution follows the Atlantic Forest area (Pl. 25: Fig. 2).

Key for species based on males

1) Epiphysis present..................................................................................... 3

2) Epiphysis absent........................................................................ C. monoargenteus

3) FW with transverse stripe, dark or light brown, postmedial line or band present.................................... 4 FW mottled or uniform orangish-brown, transverse stripe absent, postmedial line sometimes clearly present............. 6

4) FW with a dark brown stripe............................................................................ 5 FW with a light brown stripe, posterior margin of saccus deeply concave............................... C. stigmatica

5) Posterior portion of saccus pronounced.................................................... C. mariana sp. nov. Posterior portion of saccus barely differentiated.............................................. C. barbara sp. nov.

6) Posterior portion of saccus V-shaped............................................................... C. ybyra Posterior portion of saccus concave, sometimes slightly angled mesally.......................................... 7

7) Tergal lobe with posterior projections, fultura superior present................................... C. denise sp. nov. Tergal lobe without projections, fultura superior absent....................................................... 8

8) Posterior margin of saccus reinforced with rounded lateral corners.................................. C. jane sp. nov. Posterior margin of saccus simple, not reinforced........................................................... 9

9) Tip of valvae tapered.................................................................... C. regina sp. nov. Tip of valvae rounded................................................................................ 10

10) Fultura inferior twice wider than longer..................................................... C. elyana sp. nov. Fultura inferior as wide as long................................................................. C. tessellata