Stenotarsus, Perty, 1832

Roubik, David W. & Skelley, Paul E., 2001, Stenotarsus Subtilis Arrow, The Aggregating Fungus Beetle Of Barro Colorado Island Nature Monument, Panama (Coleoptera: Endomychidae), The Coleopterists Bulletin 55 (3), pp. 249-263 : 253-255

Key to the Known Stenotarsus of Panama

1) Antennomeres III–VIII not elongate, moniliform; antennal club segments narrow, nearly parallel sided ( Fig. 1 ) ---------------- S. validicornis Gerstaecker

1') Some or all of antennomeres III–VIII elongate; antennal club segments not narrowed ( Figs. 2, 3 ) ----------------------------------------------------------------------------------------- 2

2) Antennomere XI elongate and appearing curved ( Fig. 2 ); antenna long, reaching middle of elytra ---------------------------------------- S. purpuratus Gerstaecker

2') Antennomere XI oval, not elongated or curved ( Fig. 3 ); antenna not as long, reaching only basal 1/3 of elytra -------------------------------------------------------------- 3

3) Pronotal lateral margin relatively narrow ( Fig. 4 ), width at hind angle distinctly less than length of antennomere II ------- S. cyanopterus Gorham

3') Pronotal lateral margin broad for entire length ( Figs. 5–7 ), width at hind angle equal or greater than length of antennomere II ---------------------------------- 4

4) Base of pronotum between pores with margin weak or absent ( Fig. 5 ); pronotal base weakly concave over scutellum --- S. lemniscatus Gorham

4') Base of pronotum between pores with strong margin that leads into the pores ( Figs. 6, 7 ); pronotal base convex over scutellum ---------------------------- 5

5) Elytron with basal punctures in the depression next to the humerus not much larger than those near the scutellum ( Fig. 6 ); disc of elytron with weak foveate punctures ------------------------------------------------------------- S. subtilis Arrow

5') Elytron with coarse basal punctures in the depression next to the humerus distinctly larger than those near the scutellum ( Fig. 7 ); disc of elytron with notable foveate punctures, often impressed ------------------------------------------------------ 6

6) Body relatively elongate and small, less than 4.5 mm ( Fig. 8 ) ------------------------- ------------------------------------------------------------------------------------------------------------------------- S. cuprivestis Gorham

6') Body oval and larger, generally more than 4.5 mm ( Figs. 9, 10 ) ----------- 7

7) Body with color pattern ( Fig. 9 ) --------------------------------------------------------------------------- 8

7') Body entirely orange ( Fig. 10 ) ------------------------------------------------------------------------------ 9

8) Pronotal pubescence dark purple to black (best viewed in profile); metafemur of male with basal spine ( Fig. 11 ) -------- S. globosus Guérin­Méneville

8') Pronotal pubescence golden­yellow; metafemur of male lacking spine ------ -------------------------------------------------------- S. panamanus Gorham and S. chiriquinus Arrow

9) Male metatrochanter lacking spine; male genitalia long and narrow ( Fig. 15 ) ----------------------------------------------------------------------------------------- S. panamanus Gorham

9') Male metatrochanter with spine ( Figs. 12–14 ); male genitalia relatively short and broad ( Figs. 16–18 ) ----------------------------------------------------------------------------- 10

10) Male with circular depression on anterior part of metasternum ( Fig. 12 ); male genitalia simple, lacking accessory process ( Fig. 16 ) ------------------------- ----------------------------------------------------------------------------------------------------------------------- S. obtusus Gerstaecker

10) Male with transversely elongated depression on anterior part of metasternum ( Fig. 13 ); male genitalia with an accessory process ( Fig. 17 ) ----- ---------------------------------------------------------------------------------------------------------------------------------------- S. ovalis Arrow

Figures

Figs. 1–7. Stenotarsus spp.: 1–3) Antenna: 1) Stenotarsus validicornis; 2) S. purpuratus; 3) S. subtilis. 4–7) Pronota and elytral bases: 4) S. cyanopterus; 5) S. lemniscatus; 6) S. subtilis; 7) S. ovalis. Scale line = 1 mm.

Figs. 8–18. Stenotarsus spp.: 8–10) Dorsal habitus: 8) Stenotarsus cuprivestis; 9) S. panamanus; 10) S. subtilis. 11–14) Ventral view of male: 11) S. globosus; 12) S. obtusus; 13) S. ovalis; 14) S. subtilis. 15–18) Aedeagus, ventral and lateral views: 15) S. panamanus; 16) S. obtusus; 17) S. ovalis; 18) S. subtilis. Scale line = 1 mm.