Strongylium

Thomas, Michael C. & Elizabeth Okins, Katherine, 2011, An Asian Species ofStrongyliumKirby (Coleoptera: Tenebrionidae) Newly Established in South Florida, U. S. A., The Coleopterists Bulletin 65 (2), pp. 147-152 : 149

KEY TO THE ADULTS OF STRONGYLIUM KNOWN

TO OCCUR IN FLORIDA

(based on Triplehorn and Spilman 1973)

1. Antennomere 3 much shorter than 4 ( Fig. 7 ) ............................. S. simplicicolle (LeConte)

1′. Antennomere 3 as long as or longer than 4......2

2. Pronotum with distinct lateral margins; terminal antennomere usually lighter in color than preceding segments...............................3

2′. Pronotum without distinct lateral margins; antennomeres usually concolorous...............6

3. Elytral interstriae strongly carinate, strial punctures quadrate ( Fig. 1 ) ........................... ................................... S. cultellatum Mäklin

3′. Elytral interstriae not at all carinate.............4

4. Strial sulci vague or incomplete, represented only by depressed punctures, a few punctures connected by a weak sulcus or fine line, most punctures in separate depressions; punctures widely spaced within a row ( Fig. 4 ) .............. ....................................... S. anthrax Schwarz

4′. Strial sulci moderately to strongly indicated, punctures not in separate depressions; punctures closely spaced within a row by no more than width of a puncture...............................5

5. Posterior and anterior pronotal margins subequal in width; disc lacking a median, longitudinally impressed line, punctures on disc dense and deep, sometimes rugulose; pronotal surface microtextured but shining; punctures on head in somewhat elongate depressions ( Fig. 3 ) ............................ S. tenuicolle (Say)

5′. Anterior pronotal margin obviously narrower than posterior margin; a median, longitudinally impressed line usually apparent on disc, punctures on disc well-separated and shallow; pronotal surface microtextured, dull; punctures on head not in depressions ( Fig. 2 ) ................. ....................................... S. terminatum (Say)

6. Elytra with alternating blue and yellow bands, striae moderately punctate ( Fig. 5 )................. ......................................... S. aulicum Mäklin

6′. Elytra brown with iridescent green sheen; striae deeply, coarsely punctured ( Fig. 6 ) ...... ....................................... S. crenatum Mäklin

Figures

Figs. 5–7. Strongylium spp., dorsal view. 5) S. aulicum; 6) S. crenatum; 7) S. simplicicolle.

Figs. 1–4. Strongylium spp., dorsal view. 1) S. cultellatum; 2) S. terminatum; 3) S. tenuicolle; 4) S. anthrax.