Diochus maculicollis FAUVEL, 1891: 106

Irmler, Ulrich, 2017, A review of the Neotropical genus Diochus ERICHSON, 1840 (Coleoptera: Staphylinidae: Staphylininae), Beiträge Zur Entomologie = Contributions to Entomology 67 (1), pp. 1-62 : 22-23

Diochus maculicollis FAUVEL, 1891: 106

Figs 22A–C , 39I , 43F

Type material examined: 3 syntypes: Venezuela: Caracas , 1 male, without further data ( IRSB) ; 1 male, 1 female, Colonia Tovar, 1.11.1888 leg. E. Simon ( IRSB) .

Further material examined: Panama: Chiriqui, Cerro Colorado , 1290 m elev., tree buttress, female, 10.1.1981, leg. W. Suter ( FMNH) ; Venezuela: without additional information to location, 3 males, 1858, Moritz, coll. Schaufuss, det. as D. nanus (1 ZMUH, 2 NMW) ; Pittier National Park , moist forest, wet litter, male, 26.3.1998, leg. C. Schimdt ( UIC) ; Carabobo, Bejuma env. Cerro de Paja (68°14'W, 10°16'N), 1400–1500 m elevation, female, 15.11.2005, leg. V. Brachat ( VAC) ; Caracas , 2 females, without more data, coll. Kraatz ( SDEI) ; Edo . Aragua, 19 km N Maracay, road to Choroni , 1300 m elev., litter near stream, 3 males, 3 females, 16.4.1994, leg. L. Herman #2798-2799 (5 AMNH, 1 UIC) ; same Prov , 18.9 km S Choroni, 2900 ft. elev., litter near stream, male, 2.3.1992, leg. L. Herman ( AMNH) ; Ecuador: Napo Prov., 5 km S Baeza on road to Tena , 1700 m elevation, under rocks and logs, female, 28.4.1990, leg. C. Carlton & R. Ardave ( KNHM) ; Napo, 33 km N Tena, 59 km E on Loreto Road , 2,800 ft. elev., litter on dry slope, male, 4.11.1988, leg. L. Herman ( AMNH) ; Napo Prov., 5.5 km S Baeza, 5800 ft. elev., Baeza-Tena rd. , litter near stream, female, 28.5.1993, leg. L. Herman #2751-2765 ( AMNH) .

Diagnosis: Within the group, D. maculicollis is similarly sized as D. brooksi and D. ecuadoriensis . It can be distinguished from both species by the orange to yellow colouration of the head and pronotum and the lighter antennae. Moreover, the setation of the paramere is different. Whereas D. maculicollis has three short setae, two subapical setae at inner side and one apical seta, D. brooksi and D. ecuadoriensis have three long setae at outer edge of paramere.

Description: Length: 3.2 mm. Colouration: yellow; head slightly darker yellow, elytra dark, nearly black; abdomen slightly lighter than elytra; legs yellow; antennomeres 1–3 yellow; 4–7 brown; 8–11 light yellow.

Head: 0.50 mm long, 0.38 mm wide; eyes not prominent; large; EL: HL = 0.29; temples 1.5 times as long as eyes; slightly divergent posteriad; PW: EW = 1.15; posterior angles widely rounded; on clypeus, on interocular space and on temples with sparse, but deep setiferous punctures; on clypeus and on interocular space two longitudinal lines with four to five punctures; between inner lines with wide impunctate midline; vertex impunctate; without microsculpture; surface shiny.

Antennae as long as head and half of pronotum combined; antennomeres 1 to 3 elongate; approximately twice as long as wide; first antennomere slightly thicker than following ones and with long thick setae; fourth antennomere quadrate; following antennomeres approximately twice as wide as long; antennomeres four to 11 pubescent.

Pronotum: 0.52 mm long, 0.46 mm wide; widest at middle; sides slightly rounded and narrowed to anterior and posterior angles; angles widely rounded; lateral margin fine; in dorsal aspect, covered in anterior half; very sparsely punctate; longitudinal line of three to four setiferous punctures on each side of wide impunctate midline; laterad few more setiferous punctures; without microsculpture; surface shiny.

Elytra: 0.50 mm long, 0.60 mm wide; widest at posterior angles; posterior margin triangularly emarginate; continuously divergent from shoulders to posterior angles; shoulders widely rounded; setiferous punctures in longitudinal lines; one line directly adjacent to suture line; three lines on disk and two further lines laterad; indistinct, irregular extremely weak ground-sculpture; less shiny than head and pronotum.

Abdomen densely pubescent and matt in contrast to fore-body.

Aedaegus elongate; seminal vesical of endophallus elongate; approximately two third of total length of central lobe; basal inner duct with short loop in anterior half; paramere with broad basal part and sinuate apical part; in apical half two short setae pointing to inner side; at apex another short seta at outer edge; several sensillae at basal shaft.

Spermatheca irregularly coiled; bursa copulatrix in lateral position to coiled duct.

Figures

Figs 43: Fore-bodies of Diochus schuelkei (A), D. tricolor (B), D. vicinus (C), D. brooksi (D), D. ecuadoriensis E), D. maculicollis (F), D. mexicanus (G), D. peruvianus (H); scale bar: 0.5 mm.

Figs 22–25:Diochus maculicollisgroup:ofD. maculicollis(22),D. peruvianus(23),D. mexicanus(24),D. pumilio (25);aedeagus (A),

Fig. 39: Spermathecae of Diochus inornatus-group: D. schuelkei (A), D. plaumanni (B), D. tricolor (C), D. vicinus (D); Diochus maculicollis-group: D. brooksi (E), D. ecuadoriensis (F), D. maculicollis (G), D. pumilio (H), D. peruvianus (I), D. mexicanus (J), D. panamaensis (K); Diochus schaumii-group: D. angustiformis (L); scale bar: 0.1 mm.