Dichelops, Spinola, 1837

Klein, Joana Tartari, Barcellos, Aline, Grazia, Jocélia & Redaelli, Luiza Rodrigues, 2012, Contributions to the knowledge of Dichelops (Dichelops) with the description of a new species (Hemiptera: Heteroptera: Pentatomidae: Pentatominae: Carpocorini), Zootaxa 3157, pp. 61-68 : 62

Key to the species of subgenus Dichelops (modified from Grazia, 1978)

1. Humeri not projected, obtuse or bearing a small spine, at most barely surpassing rhomboid projections of posterolateral margins of pronotum (figs. 1‒3)............................................................................. 2

1´. Humeri projected as wide, subacute or acute at apex processes, or with long spines surpassing an imaginary longitudinal line crossing third tergite (fig. 4)............................................................................ 5

2. Superior process of pygophore present..................................................................... 3

2´. Superior process of pygophore absent......................................................... saltensis Grazia

3. Ventral rim with bristle tufts laterad to median notch (fig. 6); parameres twisted, head of paramere shorter than foot (fig. 10)........................................................................................ avilapiresi Grazia

3’. Ventral rim of pygophore without 1+1 bristle tufts laterad to median notch (figs. 7‒9); parameres not twisted (figs. 11‒13), head of paramere as long as foot.......................................................................... 4

4. Outer anterolateral angles of sternites with a small black spot; ventral rim of pygophore straight in the middle (fig. 7); gc8 tumescences wide, occupying inner 3/4 of each plate (fig. 18); capsula seminalis with three projections.... australis sp. nov.

4’. Outer anterolateral angles of sternites without a small black spot; ventral rim of pygophore with a mesial notch (fig. 9); gc8 tumescences narrower, occupying inner half of each plate (fig. 17); capsula seminalis with two projections..... pradoi Grazia

5. Juga abruptly convergent at tylus level, thence narrowing progressively towards acute apex.......................... 6

5´. Juga uniformly narrowing toward acute apex............................................................... 9

6. Humeri as broad projections, subacute apically, directed anterolaterad, just surpassing an imaginary longitudinal line across third connexivum..................................................................................... 7

6´. Humeri produced as long spines, acute apically, quite surpassing an imaginary longitudinal line across third connexivum.. 8

7. Ventral rim of pygophore uniformly concave, straight at middle, bristle tufts present only at distal angles (fig. 8); superior processes of dorsal rim produced as a spine......................................................... bicolor Distant

7´. Ventral rim of pygophore bisinuate, triangular projections not surpassing posterolateral angles of pygophore; bristle tufts at distal angles of ventral rim and also over triangular projections; superior processes of dorsal rim spatulate... peruanus Grazia

8. Posterolateral angles of connexivum well developed in acute tubercles; connexivum with darker castaneous punctures, anterolateral angles stained with black; ventral rim of pygophore largely concave, distal angles not projected, with bristle tufts; median bristle tufts of ventral rim absent; capsula seminalis with three teeth......................... punctatus Spinola

8´. Posterolateral angles of connexivum projected in little spines; connexivum with concolorous punctures; ventral rim of pygophore narrowly concave, distal angles projected inward, with bristle tufts; median bristle tufts of ventral rim present; capsula seminalis with two teeth............................................................... leucostigmus (Dallas)

9. Disc of head outlined by darker punctures; humeral angles in a spine just surpassing rhomboid projections of posterolateral margins of pronotum; posterolateral angles of connexivum with conspicuous spines; connexivum with castaneous punctures at apical third of each segment; ventral rim of pygophore projected inward in a narrow flap, sinuate in ventral view, distal angles with thick bristle tufts..................................................................... miriamae Grazia

9’ Disc of head not detached; humeral angles in long spines directed laterad, well surpassing an imaginary line across third connexivum; posterolateral angles of connexivum slighted projected, castaneous or black punctures at inner half of each segment, outer half with concolorous punctures; ventral rim of pygophore uniformly concave or sinuate at middle, with 1+1 triangular projections which surpass the posterolateral angles of pygophore; bristle tufts absent................... nigrum Bergroth