Parachorius bolavensis Tarasov new species (Figs. 7, 25B) urn:lsid:zoobank.org:act:A116D60D-8D17-434E-8AAD-84A0C331C23E Type locality. Bolaven Plateau, Laos Etymology. The name of this species is derived from its type locality in Bolaven plateau, southern Laos. Distribution. The species is known only from the two localities on Bolaven plateau in southern Laos where the type series was collected. Presumably, this species is endemic to Bolaven plateau that has unique climatic conditions due to its elevation (average height is approximately 1000 m) over the lowlands. Diagnosis. This species is most closely related to P. fukiensis. It differs from P. fukiensis and the remaining Parachorius species by the shape of aedeagus (parameres widened basally, their apices acute) and by the widely rimmed middle dilation of the posterior metafemoral margin. Description. Body. Body black, length 4.2–4.5 mm. Elytra uniformly colored, mostly black. Head. Clypeus with two teeth, outer margin of each tooth distinctly notched basally. Pronotum. Pronotum rounded laterally. Frontal angles rounded. Disc covered with punctures separated by 1–2 puncture diameter(s). Pronotum in anterior-posterior direction notably shorter than elytra. Elytra. Elytra covered with sparse punctures. Wings. Wings normally developed. Legs. Profemur with anterior margin medially produced in angle or with almost straight or sinuate anterior margin. Protibia with apical spur approximately reaching middle of protarsomere 3. First tooth normal, notably modified in males, approximately twice as wide as second tooth; first and second teeth distinctly separated from each other, first tooth distinctly separated from denticles located between first and second teeth. Metafemoral posterior margin not serrate, dilated medially, dilation widely rimmed. Metatibia slightly sinuate, inner margin not denticulate, produced into a small angle apically. Metasternum. Transverse basal ridge of metasternum reduced and extremely short. Aedeagus. Parameres symmetrical, widened basally (lateral view), apex acute. Holotype. Male (Fig. 7D). Profemur with anterior margin medially produced in angle. Material examined. Holotype: Laos: male, "S[outhern] Laos, Bolaven plateau, Ban Houayteuay h 1200m N 15°4.655' E 106°16.848' disturb montane forest pitfall traps leg. S. Tarasov 6.5 - 14.6.2008 / HOLOTYPUS Parachorius bolavensis S. Tarasov det. 2010", 15°4.655'N, 106°16.848'E (ZMUC). Paratypes (10 males, 10 females): 8 male paratypes, 6 female paratypes, Champasak Province: Bolaven Plateau, Ban Thôngvay (= Xékatam) vicinity, old logging road N of village, FMHD#2008-037, ANMT site 1231, 15°14.288'N, 106°31.891'E, 1095 m, selectively logged forest, on 8–16/vi/2008 (A. Newton, M. Thayer) (FMNH); 1 male paratype, 3 female paratypes, Champasak Province: Bolaven Plateau, Ban Thôngvay (= Xékatam) vicinity, old logging road N of village, FMHD#2008-040, ANMT site 1232, 15°14.494'N, 106°31.807'E, 1170 m, selectively logged forest, on 8–16/vi/2008, (A. Newton, M. Thayer) (FMNH); 1 male paratype, 1 female paratype, Champasak Province, Bolaven Plateau, Ban Houayteuay, 15°4.655'N, 106°16.848'E, 1200 m, disturb montane forest, on 6/v–14/vi/2008 (S. Tarasov) (CST).

Published as part of Tarasov, Sergei, 2017, A cybertaxonomic revision of the new dung beetle tribe Parachoriini (Coleoptera: Scarabaeidae: Scarabaeinae) and its phylogenetic assessment using molecular and morphological data, pp. 101-149 in Zootaxa 4329 (2) on pages 117-119, DOI: 10.11646/zootaxa.4329.2.1, http://zenodo.org/record/1001915