Stenocerus, Schoenherr, 1826

Key to Stenocerus View in CoL species

1. Intercoxal process of mesosternum spatulate, amply impressed, not swollen at apical and lateral margins ( Figs. 22 View FIGURES 17–28 , 50 View FIGURES 45–56 )..... 2

- Intercoxal process of mesosternum not spatulate, with groove or tubercle ( Figs. 8 View FIGURES 3–14 , 36 View FIGURES 31–42 , 60, 61 View FIGURES 60–62 )......................... 6

2. (1). Disc of pronotum evenly convex, lacking grooves or impressions, with dark hexagonal spot, wider at base, delimited by yellowish scales. Elytra with a large dark rounded spot................................. S. sigillatus Jordan, 1906 View in CoL ( Brazil)

- Disc of pronotum with medial depression or grooved ( Fig. 20 View FIGURES 17–28 ). Elytra lacking large dark rounded spot ( Fig. 23 View FIGURES 17–28 )........... 3

3. (2). Elytra with checkered pattern on interstriae 1, alternate black spots at median third arranged obliquely on interstriae 3, 4, 5 and 7, almost forming a stripe ( Figs 15 View FIGURES 15–16 , 23 View FIGURES 17–28 )................................................ S. fratris sp. nov. ( Brazil)

- Elytra vestiture not as above, and lacking transverse post-median stripe........................................... 4

4. (3). Intercoxal process of mesosternum impressed at apex, anterior margin concave, lacking latero-apical expansion, sides sinuous and feebly convergent, and posterior margin subrounded ( Fig. 50 View FIGURES 45–56 ).................... S. mesosternalius sp. nov. ( Brazil)

- Intercoxal process of mesosternum very feebly impressed at apex, lacking latero-apical expansion, sides strongly convergent, and posterior margin broadly rounded..................................................................... 5

5. (4). Antennae with elongate, fine and erect setae only at apex of antennomere III. Ventrites I–IV (in males) with medial tuft................................................... S. varipes Fahraeus, 1839 View in CoL ( Costa Rica, Ecuador, Brazil and Bolivia)

- Antennae with elongate, fine and erect setae, throughout antennomeres III-XI. Ventrites I –IV (in males) lacking medial tuft.......................................... S. angulicollis Jekel, 1855 View in CoL ( Mexico, Central America, Colombia and Brazil)

6. (1). Head with red vertex. Disc of pronotum with two longitudinal deep grooves lined with pale yellowish pubescence......................................................... S. frontalis Gyllenhal, 1833 View in CoL ( Costa Rica, French Guiana and Brazil)

- Head with brown to black vertex. Disc of pronotum with weak medial impressions, concolorous with sides (without longitudinal groove or stripe)................................................................................... 7

7. (6). Intercoxal process of prosternum lacking impression or grooves................................................. 8

- Intercoxal process of prosternum impressed or grooved...................................................... 10

8. (7). Dorsal vestiture of pronotal disc with minute circular central spot formed by dark scales. Intercoxal process of mesosternum with apical margin biconvex. Tarsomeres I and II yellowish............ S. fulvitarsis (Germar, 1824) View in CoL ( Brazil and Paraguay)

- Dorsal vestiture of pronotal disc entirely black, either with or lack a large gray or yellow triangle. Intercoxal process of mesosternum with apical margin convex. Tarsomeres I and II yellowish or darkened..................................... 9

9. (8). Elytral vestiture with dense yellowish scales, at middle and apex with black scales giving an hourglass appearance, interstriae 1 and 3 with subrounded black spots (or the yellowish vestiture more restricted, not forming transverse stripe at apical declivity)................ S. nigrotessellatus Blanchard, 1847 View in CoL ( Costa Rica, Panama, Ecuador, Bolivia, Peru, Guyana and Brazil)

- Elytral vestiture darkened, with distinct transverse yellowish stripe at beginning of apical declivity ( Fig. 29 View FIGURES 29–30 )............................................................................................... S. similis sp. nov. ( Peru)

10. (7). Intercoxal process of mesosternum with apical margin concave and bituberculate..................................................................... S. longulus Jekel, 1855 View in CoL ( United States ( Texas), Mexico, Central and South America)

- Intercoxal process of mesosternum with apical margin not tuberculate. ( Fig 8 View FIGURES 3–14 )................ S. christus sp. nov. (Brazil)