Crostis boreodes Prena & Anderson new species

Diagnosis. Total length 2.5–2.8 mm; body form oblong-ovate, L/W elytra 1.06–1.23 (Figs. 7–8). Characteristic for this species of Crostis are (i) transverse pronotum with disc longitudinally striate or with striae broken into elongate punctures and most of flanks with elongate punctures (Figs. 13–14), (ii) length of first funicular article slightly shorter than combined lengths of articles 2–4, (iii) punctures of ventrites I and II large (Fig. 19), lateralmost areas of ventrite I with 2 punctures along length, ventrites I and II with distinct isodiametric microsculpture (also on metasternum), and (iv) penis with apex protruded medially, strongly expanded laterally towards base, endophallus distally with symmetrical, elongate, fluted, gutter-like endophallite with equally thickened and sclerotized margins, apodemes ca. 2.2× longer than length of penis body (Fig. 21).

Etymology. The name is derived from the similarity of this species to C. boreas .

Natural history. The three known specimens have been sifted from leaf litter in forests from 2600–3170 m in elevation.

Notes. Two of the specimens are incorrectly labelled as Querétaro but GPS coordinates indicate the locality is just across the state border into Michoacán.

Material examined. Holotype male, MEXICO: Michoacán [Querétaro on label], 13.6km SSE Huimilpan, 20.25213, -100.25499, 2720m, 17 viii.2009, L. Saenz, oak forest leaf litter (CMNC) . Paratypes (1 male, 1 female): Michoacán [Querétaro on label], Municipio Amealco, 4 km SE. Lag Servin, 20°15.25’N, 100°15.19’W, 22 Aug 2002, R . Jones, 2600m, hojarasca (1 male, UNAM) . Guanajuato, Municipio Tierra Blanca, Cerro Zamorano, 20°56’01”N, 100°11’06”W, 24.xi.2012, J. Vadillo, 3170m, leaf litter (1 female, CMNC) .