Baryopsis montivagans ( BERNHAUER 1906) Assing, 2012

Assing, V., 2012, On the Baryopsis species of Peru (Coleoptera: Staphylinidae: Paederinae: Cryptobiina), Linzer biologische Beiträge 44 (1), pp. 335-346 : 342-344

Baryopsis montivagans ( BERNHAUER 1906) , nov.comb. ( Figs 22-30 )

Latona montivagans BERNHAUER 1906: 323 f.

T y p e m a t e r i a l e x a m i n e d Lectotype 3, present designation: "Cerro de Pasco, Peruvia. 4000 m / Latona montivagans 3 Brh. Typus / Chicago NHMus M.Bernhauer Collection / Lectotypus 3 Latona montivagans Bernhauer desig. V. Assing 2011 / Baryopsis montivagans (Bernhauer) det. V. Assing 2011" (FMNH). Paralectotype ♀: same data as lectotype, but "Cotypus" (FMNH).

C o m m e n t: The original description is based on an unspecified number of syntypes, among them at least one male, from " Peru: Cerro de Pasco, 4000 m " ( BERNHAUER 1906). Two syntypes, a male and a female, were located in the Bernhauer collection at the FMNH. The male is designated as the lectotype.

The preoccupied generic name Latona was replaced with the nomen novum Pseudocryptobium by BERNHAUER (1921). An examination of the above type material revealed that L. montivagans undoubtedly belongs to Baryopsis .

R e d e s c r i p t i o n: Body length 14-15 mm. Forebody as in Fig. 22 . Coloration: body dark-brown to blackish brown, with slightly paler elytra; legs brown to dark-brown; maxillary antennae dark-reddish.

Head ( Figs 22-23 ) weakly oblong, 1.03-1.04 times as long as broad; lateral margins almost straight and subparallel in dorsal view; posterior angles obsolete; macropunctation sparse and coarse, median dorsal portion extensively without macropunctation; micropunctation dense, barely noticeable in the pronounced microreticulation, which is composed of fine isodiametric meshes; surface with subdued shine. Eyes small, weakly projecting from lateral contours of head and 1/5-1/4 the length of postocular region in dorsal view.

Pronotum ( Figs 22, 24 ) relatively short and broad, approximately 1.15 times as long as broad and about as wide as head; lateral margins subparallel and practically straight in dorsal view; dorsal series composed of 8-10 macropunctures; micropunctation dense everywhere; microreticulation present, but shallow, composed of fine isodiametric meshes.

Elytra ( Figs 22, 25 ) short, approximately 0.55 times the length of pronotum, weakly dilated posteriad; posterior margin obliquely truncate; dorsal surface with shallow, sparse macropunctures; micropunctation indistinct; surface with pronounced microreticulation and almost matt. Hind wings completely reduced. Metatarsomere I longer than II, but slightly shorter than the combined length of II and III.

Abdomen distinctly wider than forebody, widest at segment VI; punctation relatively dense and fine; interstices with microsculpture composed of transverse meshes; posterior margin of tergite VII without palisade fringe; posterior margin of tergite VIII convex, without sexual dimorphism.

3: protarsomeres I-IV distinctly dilated; sternite VII not distinctly modified; sternite VIII with moderately deep V-shaped posterior excision ( Fig. 26 ); aedeagus ( Figs 27-30 ) approximately 2.3 mm long; ventral process long, parallel-sided, apically not dilated (ventral view), and distinctly hooked (lateral view); parameres (without apical setae) not reaching apex of ventral process.

♀: protarsomeres I-IV of similar morphology as in male.

C o m p a r a t i v e n o t e s: In external characters, B. montivagans is most similar to B. glabra , but distinguished from that species by slightly larger size (apparently no overlap), the more pronounced microsculpture on the head, the presence of microsculpture on the pronotum, the shape of the pronotum ( B. glabra : distinctly tapering in posterior half), the presence of pronounced microreticulation on the posteriorly only weakly dilated elytra, and the much larger aedeagus with a ventral process of different shape.

D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: The species is known only from one locality near Cerro de Pasco in the northern Peruvian Andes, where the type specimens were collected at an altitude of 4000 m.

Figures

Figs 22-30: Baryopsis montivagans (BERNHAUER), lectotype: (22) forebody; (23) median portion of head; (24) median portion of pronotum; (25) sutural portion of elytra; (26) male sternite VIII; (27-28) aedeagus in lateral and in ventral view; (29) apical portion of ventral process in lateral view; (30) apical portion of ventral process in ventral view. Scale bars: 22-28: 1.0 mm; 29-30: 0.5 mm.