Lathrobium (Lathrobium) washingtoni 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) washingtoni Casey, 1905

Lathrobium washingtoni Casey, 1905: 87.

Lathrobium illini Casey, 1905: 86. New synonym.

Lathrobium longiventre Casey, 1905: 85. New synonym.

Lathrobium picescens Casey, 1905: 85. New synonym.

Lathrobium vancouveri Casey, 1905: 86. New synonym.

Type material.

Lectotype, Lathrobium washingtoni Casey, herein designated (USNM): "N. H. / ♂ / [red] TYPE USNM 38121 / CASEY bequest 1925 / [handwritten] Lathrobium washingtoni / Lectotype Lathrobium washingtoni Casey Desg. Haberski & Caterino." Lectotype, Lathrobium illini Casey, herein designated (USNM): "Illinois / CASEY bequest 1925 / [handwritten] Lathrobium illini / [red] TYPE USNM 38118 / Lectotype Lathrobium illini Casey Desg. Haberski & Caterino." Lectotype, Lathrobium longiventre Casey, herein designated (USNM): "Bayfld / CASEY bequest 1925 / [handwritten] Lathrobium longiventre / [red] TYPE USNM 38115 / Lectotype Lathrobium longiventre Casey Desg. Haberski & Caterino." Lectotype, Lathrobium picescens Casey, herein designated (USNM): "N.H. / CASEY bequest 1925 / [handwritten] Lathrobium picescens / [red] TYPE USNM 38116 / Lectotype Lathrobium picescens Casey Desg. Haberski & Caterino." Lectotype, Lathrobium vancouveri Casey, herein designated (USNM): "Br.C / CASEY bequest 1925 / [handwritten] Lathrobium vancouveri / [red] TYPE USNM 38117 / Lectotype Lathrobium vancouveri Casey Desg. Haberski & Caterino."

Other material.

Canada: British Columbia: Terrace, Hippisley (1, MCZ). Newfoundland : ‘N’f’land’ 19-24 Jul 1907 (1, MCZ) . USA: Alaska: Fairbanks North Star Borough: Nome Creek , 11 Jun 2018, R. Nowicki (1, UAM) . Minnesota: ‘Min.’ (2, USNM) . New Hampshire: 'N. H.' (1, USNM); Coos Co.: Mount Washington (1, MCZ); Grafton Co.: Woodstock, White Mountains (1, USNM) . Wisconsin, Bayfield Co. Bayfield (1, USNM) .

Diagnosis.

This species is similar in appearance to L. leconteanum and can be differentiated as discussed in the diagnosis of L. leconteanum .

Description.

Body length 6-7 mm; body coloration dark red, appendages lighter red. Gular sutures, widely separate, converging slightly posteriorly; antennomeres V-VIII as wide as long. Elytra as long as pronotum. Females with paraprocts divided; sternite VIII strongly oblong, tip 1/3 width of base. Genitalia as in Fig. 52 .

Distribution.

Canada: AB, BC, MB, NB, NF, NS, NT, ON, QC, SK ( Bousquet et al. 2013). USA: AK, ID, IL, MN, MT, NH, WI ( Newton 2022).

Remarks.

We reduce Lathrobium illini , Lathrobium longiventre , Lathrobium picescens , and Lathrobium vancouveri to synonymy with Lathrobium washingtoni , because the original diagnoses were based on a single inaccurate character. All four of the herein synonymized species were distinguished from L. washingtoni by having the middle joints of the antennae not longer than wide, as opposed to “elongate” ( Casey 1905). We measured the fifth antennomeres of each species and found the ratio of length to width varied within and between species from 1.1 to 1.4 × as long as wide, making this character useless for diagnosis. We examined the genitalia and found no differences among species in males or females.

Subgenus Lathrobium Lathrolepta Casey, 1905: 72.

Figures

Figures 50 - 53. Lathrobium terminalia A female terminalia B male sternite VIII C aedeagus in ventral view D aedeagus in lateral view. 50 L. sparsellum 51 L. spissicorne 52 L. washingtoni 53 L. debile. Scale bars: 1 mm.