Scirtes Illiger, 1807

Springer, Charles A. & Waller, Deborah A., 2021, A new species of Scirtes Illiger, 1807 (Coleoptera: Scirtidae) from Virginia and South Carolina, U. S. A., Insecta Mundi 2021 (882), pp. 1-9 : 7-8

Key to Species of Scirtes Illiger for America North of Mexico

1. Larger , body length of pronotum and elytra together more than 4.50 mm ; body elongate, more than 1.67 times longer than wide; pronotum with anterolateral angles produced anteriorly; pronotum less transverse, pronotal width across posterior margin less than 2.75 times length of lateral margin; eyes notched medially by recess for antennomere I; lateral margin of elytra more explanate, width of turned out rim equal to width of mesotibia; elytra with three longitudinal carinae on lateral half, or absent; elytra variously vittate or immaculate; body length 4.50–4.94 mm; Florida to Texas ................................................................. S. oblongus Guérin-Méneville

— Smaller, body length of pronotum and elytra together less than 4.50 mm; body more oval, less than 1.67 times longer than wide; pronotum with anterolateral angles not produced; pronotum more transverse, pronotal width across posterior margin more than 2.75 times length of lateral margin; eyes unnotched, medial margin entire; lateral margin of elytra less explanate, width of turned-out rim less than width of protibia; elytral carinae absent; elytra never vittate, but can have single orange-red to orange-brown sutural stripe on middle 1/3............................................. 2

2(1). Clypeus with antero-lateral angles recurved laterally to form a point near scape; elytra unicolorous, without orange-brown sutural stripe on middle 1/3, head, pronotum and proepisternum without light markings........................................................................... 3

— Clypeus with antero-lateral angles not recurved; elytra usually with a distinct orange-brown sutural stripe on middle 1/3; head, pronotum and proepisternum with white, yellowish, tan or orange markings to various degrees, or none........................................................ 5

3(2). Antennomere II arises subapically on lateral side of antennomere I; antennomeres IV–X with various degrees of serration, or none; clypeus with large antero-medial emargination, 3.28–4.0 times wider than deep; last visible abdominal sternite of males broadly rounded or straight, not emarginate; length 2.15–3.13 mm; Arizona ....................................... S. plagiatus Schaeffer

— Antennomere II arises apically from antennomere I; antennomeres IV–X not serrate; clypeus with small antero-medial emargination, about 10 times wider than deep; last visible abdominal sternite of males with shallow emargination, 7–17 times wider than deep; size variable.................. 4

4(3). Larger, length of pronotum and elytra together 2.60–4.13 mm; antennae longer than 1.30 mm; body more oval, 1.31–1.59 times longer than wide; clypeus with antero-medial emargination shallower, 10–28 times longer than wide; mandible without a tooth, apex rounded; generally distributed east of the 100th meridian........................................... S. tibialis Guérin-Méneville

— Smaller, length of pronotum and elytra together 2.19–2.45 mm; antennae shorter than 1.30 mm; body more elongate, 1.60–1.64 times longer than wide; clypeus with antero-medial emargination deeper, 5.33–6.76 times longer than wide; mandible with very long tooth, longer than greatest width of mandible; southern Florida ..................................................... S. goliai Epler 5(2). Pronotum usually with at least lateral 1/4 white to yellowish, orange or tan, varying to entire disc completely lighter; proepisternum same color as lateral pronotum; head can be orange or tan like pronotum; elytra with sutural stripe usually orange-red to orange-brown, or absent; areas without above pigmentation brown to black; elytra more convex, length of elytra 2.71–3.75 times mid-elytral height (convexity); body more circular, less than 1.47 times longer than wide; mandibular tooth longer, length of tooth 1/2 or more than width of mandible; body length 2.11–3.08 mm; generally distributed east of the 100th meridian............................. S. orbiculatus (Fabricius)

— Head , pronotum and proepisternum completely unicolorous, brown to black ; elytra with sutural stripe usually orange-brown, or absent; elytra less convex, length of elytra 4.10–5.58 times mid-elytral height; body more elongate, 1.47 or more times longer than wide; mandibular tooth shorter, length of tooth 1/3 or less than width of mandible; body length 2.39–3.10 mm; Virginia, South Carolina .............................................. S. goodrichi Springer and Waller , new species