A revision of the Chilean Brachyglutini - Part 4. Revision of Achilia Reitter, 1890: A. puncticeps and A. approximans species groups, with description of seven new species (Coleoptera: Staphylinidae: Pselaphinae) Author Sabella, Giorgio Author Cuccodoro, Giulio Author Kurbatov, Sergey A. text Revue suisse de Zoologie 2019 2019-03-31 126 1 127 145 journal article 10.5281/zenodo.2619528 a0525610-166a-4a90-97cb-6cd78d98a706 0035-418 2619528 Achilia cunniceps n. sp. Figs 7 , 11 , 23 , 35, 37, 39 , 57 Holotype : MHNG (# MHNG-ENTO-13837); 1 ♂; SOUTHERN CHILI : Región Los Lagos : Osorno prov. : Puyehue National Park , Antillanca road; 500-1000 m ; 18-20.XII.1984 ; S. & J. Peck ; car netting. Paratypes (3): MHNG (# MHNG-ENTO-13838 & 13839); 2 ♂; SOUTHERN CHILI : Región Los Lagos : Osorno prov. : same data as holotype . – Chiloé prov.: FMNH (FMHD # 2002-77 ); 1 ♂; road to Miraflores, about 0.6 km W road 5; 42° 46.74’S 73° 47.70’W ; 130 m ; 12.XII.2002 ; A. Newton & M. Thayer 1063; secondary Valdivian forest with few conifers, Berlese, leaf & log litter . Description: Body 1.35-1.40 mm long, entirely dark with reddish brown elytra, antennae, palpi, and legs. Head with eyes moderately protruding, about long as convex temples. Pronotum slightly wider than head; median antebasal fovea smaller than lateral ones. First abdominal tergite with basal striae extending to about one-third of paratergal length, and separated at base by about one-third of tergal width. Male : Head as in Figs 35, 37, 39 , with anterior part flattened; vertexal sulcus indistinct; posterior part conspicuously raised, strongly convex in lateral view ( Fig. 37 ), this hump anteriorly flattened, densely punctate, pubescent, and sulcate medially. Antennae ( Fig. 11 ) with scape longer than wide and pedicel only slightly longer than wide; antennomeres III-IV and VII slightly wider than long; antennomeres V-VI longer than wide, antennomere VIII strongly transverse with mesal margin protruding at middle; antennomeres IX and X strongly transverse with protruding mesal margins; antennomere XI very elongate and distinctly longer than VI-X combined, its surfaces with tubercles. Metaventrite raised at middle, this area distally pubescent and densely punctate, divided by very wide median sulcus. Legs with trochanters very elongate; surface of mesotrochanters bearing numerous long bristles; ventral margin of mesotrochanters projecting posteriorly in a spine ( Fig. 23 ); profemora and mesofemora slightly thickened; protibiae with short subapical spur on medial margin, distal half slightly sinuate and bearing long and thick bristles; distal half of metatibiae slightly sinuate. Abdominal tergites and ventrites unmodified. Aedeagus ( Fig. 7 , dorsal longitudinal struts not shown) 0.26- 0.27 mm long; medial sclerites with 5-6 apical spines, associated on each side with three pointed sclerites, the first with two tips. Female : Unknown. Collecting data: Collected in December, at elevations ranging from 130 to 1000 m , by car netting, and by sifting in Valdivian rainforests. Distribution: Achilia cunniceps n. sp. is known from Southern Chile ( Fig. 57 : blue triangles) only in Región Los Lagos (Chiloé and Osorno provinces). Comments: Achilia cunniceps n. sp. is easily distinguished from the other members of the genus by the very peculiar morphology of the male head ( Figs 35, 37, 39 ), features of the antennae ( Fig. 11 ), and the copulatory pieces of the aedeagus ( Fig. 7 ).