valid. However, a detailed description of M. tengara is lacking.In the present study, several fish specimens consistent with Hamilton's (1822) description of Mystus tengara were examined. Here we redescribe M. tengara and distinguish it from its closest congener, M. vittatus and other striped Mystus of the Ganga-Brahmaputra drainage, viz.,and M. bleekeri (Day). Materials and MethodsMeasurements were made with a dial caliper to the nearest 0.1mm. Subunits of the head are presented as proportions of head length (HL). Head length and measurements of body parts are given as proportions of standard length (SL). Methods for counts and measurements follow Ng & Dodson (1999). Numbers in parentheses following a count are the number of specimens with that count. Dorsal fin height is measured from the base of spinelet to the highest point of the dorsal fin. Twenty specimens were dissected and cleared for osteological studies. Clearing and staining of specimens follow Hollister (1934) and osteological nomenclature follows Mo (1991) and Darshan et al. (2010). Gill rakers were counted on the first left branchial

Physoschistura harkishorei, a new species of nemacheilid loach, is described from the Dibang and Lohit Rivers of Arunachal Pradesh, north-eastern India. The new species can be distinguished from all known congeners by the combination of the following characters: the second branched ray of pectoral fin with a distal filamentous extension; body colour pattern consisting of 9-10 vertically-elongated brownish spots or blotches along the flank, and 8-10 brownish saddles on back, the saddles not contiguous with the lateral blotches; lateral line complete; prominent, well-developed pelvic-fin lobe; a well-developed free posterior chamber of the air-bladder; and caudal fin with 7+8 branched rays. The new species occurs sympatrically with Physoschistura dikrongensis and P. elongata in the Brahmaputra basin.

Pimelodus carcio, originally described in 1822 by Francis Hamilton, has long been treated as a junior synonym of either Mystus tengara or M. vittatus. In this paper we revalidate and redescribe the species and diagnose it from other striped Mystus by the following combination of characters: small adult size, maturing at 44.0 mm standard length; adipose-fin base shorter than or equal to dorsal-fin base; pelvic fin reaching anal-fin origin; pectoral girdle with coracoid shield exposed ventro-laterally below pectoral fin; eyes rounded and large, dorsally orientated on head; vomerine tooth-patch interrupted at midline. The species is distributed in the Ganga-Brahmaputra drainage of northeast India and Bangladesh.

Abstract:Mystus ngasep, a new species of bagrid catfish from the headwaters of Chindwin drainage in Manipur, India, is described here. It is distinguished from its congeners in having a unique combination of the following characters: a colour pattern of the body consisting of a distinct dark tympanic spot and three brown stripes separated by pale narrow longitudinal lines, cranial fontanel reaching the base of the occipital process, a long-based adipose fin contacting the base of the last dorsal-fin ray anteriorly, 16-19 gill rakers on the first branchial arch, a slender cleithral process, pectoral spine with 9-11 serrations on the posterior edge, eye with a diameter of 16.5-19.8 % HL and prepectoral length 22.2-26.0 % SL. The new species has been compared with its congeners from Myanmar and also from northeastern India.

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