Eleusis chiriquensis, Irmler, 2019

Irmler, Ulrich, 2019, Additions to the Neotropical species of the genusEleusis LAPORTE, 1835 with description of new species (Coleoptera, Staphylinidae, Osorinae), Beiträge Zur Entomologie = Contributions to Entomology 69 (1), pp. 71-77 : 75-76

Eleusis chiriquensis spec. nov.

urn.lsid:zoobank.org.act: EA43287D-B203-42E1-8A45-C1AC74396519

Figs. 3 a-c, 4C

Type material: Holotype, male: Panama: Chiriqui Prov. “Barca” area, Finca Lerida near Boquete , under slab on pile of cut chips and bark, 5650 ft. elev., 12.3.1959, leg. H.S. Dybas ( FMNH) . Paratype: male with same data as holotype ( FMNH) :

Diagnosis: Eleusis chiriquensis resembles E. dybasi by the elongate elytra and, thus, can easily be differentiated from the other species related to E. humilis . With a length: width ratio of 1.19, the elytra are still longer than in E. dybasi . Additionally, it is slightly larger, colouration is lighter and the aedeagus is thicker.

Description: Length: 2.8. Colouration: Head brown; pronotum light brown; elytra still lighter brown to dark yellow; abdomen light brown; legs and antennae light brown to yellowish.

Head: 0.36 mm long, 0.42 mm wide; eyes large and slightly prominent; postocular space divergent; short, 0.6 times as long as eyes; parallel preocular space as long as postocular space; sides of clypeus sinuate; front margin of clypeus straight; supraocular groove short with setiferous puncture at each end; further setiferous punctures at base of antennae and close to front margin of clypeus; punctation moderately deep and sparse; interstices between punctures varying; on average, two to three times as wide as diameter of punctures; microsculpture moderately deep; on vertex, longitudinally striate; surface shiny.

Antennae: first antennomere thicker than following three antennomeres; second two thirds as long as first; third not longer than second; following antennomeres decreasing in length and increasing in width; fourth antennomere longer than wide; tenth antennomere wider than long; antennomeres four to eleven pubescent and with yellow apical setae.

Pronotum: 0.33 mm long; 0.38 mm wide; widest close to anterior angles; anterior angles widely rounded; sides strongly convergent posteriad; at posterior angles 0.6 times as long as at anterior angles; lateral interruption deep; marked by setiferous puncture; few more setae anteriad to interruption and at anterior margin; week furrow at midline in posterior half; weak depressions laterad to furrow; punctation similar to that on head; slightly sparser; on average interstices between punctures three times as wide as diameter of punctures; microsculpture similar to that on head; on disc longitudinally striate; laterally wavily striate; surface shiny.

Elytra: 0.58 mm long, 0.49 mm wide; elytra transparent; with distinct humeral angles; slightly divergent to posterior angles; posterior angles distinct; nearly rectangular; posterior margin straight; one setiferous puncture on disc; punctation and microsculpture weaker than on pronotum; surface shiny.

Abdomen: sparsely punctate; weak microsculpture transversely striate.

Aedeagus with central lobe broad in lateral aspect, most parts of central lobe equally thick; close to apex abruptly narrowed to thick apex; inner side of central lobe with weak prominence along midline; prominence marked by numerous sensillae; a few more sensillae closer to base; parameres nearly as long as central lobe; with moderately wide transparent lobe at apex; transparent lobe with numerous micro-sensillae and with apical seta.

Etymology: The species name is derived from the Panama province Chiriqui, where it was collected.

Figures

Figs 1–3:Eleusis mazureki (1), E. dybasi (2), E. chiriquensis (3); aedeagus lateral (a) and ventral (b) aspect, antenna (c); scale bar 0.1 mm. –Fig. 4: Forebody showing shape and colouration ofEleusis mazureki (A), E. dybasi (B), E. chiriquensis (C); scale bar, 0.5 mm.