Crostis boreodes Prena & Anderson, 2022

Prena, Jens & Anderson, Robert S., 2022, The genus Crostis Casey (Coleoptera: Curculionidae: Baridinae) in North America, Zootaxa 5162 (2), pp. 153-162 : 157-158

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) .

Figures

FIGURES 7–10. Crostis boreas species group, dorsal and lateral aspects. 7, 8, C. boreodes, Michoacán; 9, 10, C. caperata, Chiapas. Scale bars 0.5 mm.

FIGURES 11–16. Crostis boreas species group, details of pronotum. 11, 12, C. boreas, Texas; 13, 14, C. boreodes, Michoacán; 15, 16, C. caperata, Chiapas.

FIGURES 17–19. Crostis boreas species group, ventral aspects. 17, C. boreas, prosternum with anteriorly covered fovea; 18, C. boreas, punctation on ventrites; 19, C. boreodes, punctation on ventrites. Scale bars 0.5 mm.

FIGURES 20–22. Crostis boreas species group, male genitalia, dorsal aspect. 20, C. boreas, Texas; 21, C. boreodes, Michoacán; 22, C. caperata, Chiapas. Scale bar 0.2 mm.