Pseudastenus ferrugineus Busanello & Caron, sp. nov.

Figs. 41, 49

Material examined. Holotype. Male, dissected, deposited in DZUP, label: (1) “Brasil, Pará, Uruará/Cacau, II–III- 2015/Inverno, Serapilheira,/Reinaldo, Wully, Lucas, col.” [white label printed in black]; (3) “ HOLOTYPE / Pseudastenus ferrugineus Busanello & Caron /det. E. Caron, 2019” [red label/ printed in black] . Paratype: BRAZIL: 1 specimen from Pará (DZUP) .

15

Diagnosis. Pseudastenus ferrugineus differs from the other species with elytra longer than wide by the rust brown to reddish pronotum and the coloration of the elytra with basal two-thirds darker than apical one-third.

Description. Body length: 3.25 mm. Coloration: head dark brown; basal two thirds of elytra and abdomen dark brown to black, both darker than head; pronotum rust brown to reddish; apical one-third and appendices yellowish brown. Head 0.47 mm long, 0.52 mm wide; eyes prominent; 0.32 times as long as total length of head; 0.78 times as long as postocular length; approximately parallel; posterior margin straight; depressed on central vertex in front of neck. Pronotum 0.47 mm long, 0.54 mm wide; widest close to anterior angles; anterior margin slightly curved; posterior margin straight; sides convergingposteriad. Elytra 0.60 mm long, 0.52 mm wide; conspicuously longer thanpronotum, but slightly narrower than pronotum; sides slightly convexly curved; widest in the middle; humeral angles rounded and obtuse, but conspicuously developed; hind wings developed; posterior angles nearly rectangular; posterior margin emarginate; suture 0.86 times as long as lateral side; microtuberculate punctation larger than on head and pronotum; with yellow pubescence pointing posteriad, longer than head and pronotum; posterior edge with fringe of sparse robust setae. Abdomen with dense punctation; with yellow pubescence pointing posteriad; pubescence conspicuously longer than on the rest of body. Aedeagus elongate; 0.59 mm long; 5.85 times as long as wide; median lobe with sides slightly converging towards the apex, elongate apical sclerites, 0.13 mm long (Fig. 49).

Etymology. The specific name derives from the Latin adjective “ferrugineus” meaning rust-brown and refers to the rust brown to reddish color of the pronotum.

Geographical records. Pseudastenus ferrugineus is known only from the northwestern part of the state of Pará (Brazil).

Biological notes. The specimens of Pseudastenus ferrugineus were collected in leaf litter.