Lathrobium (Lathrobium) rhodeanum (Casey, 1905)

Haberski, Adam & Caterino, Michael S., 2024, A review of Nearctic Lathrobium (Coleoptera, Staphylinidae), with revision and descriptions of new flightless species from the mountains of the southeastern U. S., ZooKeys 1198, pp. 193-277 : 193

Lathrobium (Lathrobium) rhodeanum (Casey, 1905)

Litolathra rhodeana Casey, 1905: 94.

Lathrobium (Litolathra) rhodeanum : Bernhauer and Schubert 1912: 266.

Litolathra semirubida Casey, 1905: 94. New synonym.

Lathrobium (Litolathra) semirubidum : Bernhauer and Schubert 1912: 267.

Type material.

Lectotype, Litolathra rhodeana Casey, herein designated (USNM): "R. I. / ♂ / CASEY bequest 1925 / [red] TYPE USNM 38127 / [handwritten] Litolathra rhodeana / Lectotype Litolathra rhodeana Casey Desg. Haberski & Caterino." Lectotype Litolathra semirubida Casey, herein designated (USNM): "R.I. / CASEY bequest 1925 / [red] TYPE USNM 38128 / [handwritten] Litolathra semirubida / Lectotype Litolathra semirubida Casey Desg. Haberski & Caterino."

Other material.

USA: Massachusetts: ‘Mass’ (1, USNM) . New York: 'N. Y.' (1, USNM). Rhode Island: 'R. I.' (2, USNM). South Carolina: Hampton Co.: Bluff Lake, Webb Wildlife Management Area , 29 Apr 2017, J. C. Ciegler, UV light (1, CUAC) . Virginia: Sussex Co.: Chub Sandhill Natural Area Preserve, 24 Sep 2017, C. Harden, litter from dark moist woods near pool (2, CUAC); Botetourt Co. : Solitude Swamp, 28 Jun 2018, C. Harden, deep oak litter on swamp margin, exposed mounds (5, CUAC) .

Diagnosis.

This species closely resembles L. confusum . They differ in the lengths of the hind tarsomeres which are longer in L. rhodeanum than in L. confusum . Females are otherwise difficult to tell apart, but males are easily identified by the elongate spine in the internal sac of the aedeagus, which is unique.

Description.

Body length 7 mm. Body coloration red throughout. Females with paraprocts undivided, apices 2.7 × longer than basal portion, sternite VIII oblong. Elytra longer and wider than pronotum. Antennomeres V-VII 2 × as long as wide. Aedeagus with characteristic elongate structures of the internal sac (Fig. 48 ).

Distribution.

Canada: QC ( Newton 2022). USA: MA, NY, RI, SC, VA.

Remarks.

We reduce Lathrobium semirubidum to synonymy with Lathrobium rhodeanum . Lathrobium semirubidum was described from a single specimen that subtly differs from L. rhodeanum in body coloration, punctation, and head width, but these differences do not exceed the intraspecific variation observed in longer series of other Lathrobium . The lectotypes of both species were collected from the same location, on the same day, and their aedeagi are indistinguishable.

Figures

Figures 44 - 49. Lathrobium terminalia A female terminalia B male sternite VIII C aedeagus in ventral view D aedeagus in lateral view. 44 L. leconteanum 45 L. lineatocolle 46 L. pedale 47 L. praelongum 48 L. rhodeanum 49 L. simile. Scale bars: 1 mm.