A new mayfly species of Choroterpes (Choroterpes) Eaton, 1881 (Ephemeroptera: Leptophlebiidae) from southern Western Ghats, India.

A new species of Choroterpes (Choroterpes) Eaton, 1881 is described based on nymphs from southern Western Ghats, Karnataka, India. Choroterpes (Choroterpes) kumaradhara sp. nov. can be distinguished from other Oriental species of Choroterpes s.str. by the following combination of characters: (i) median emargination of labrum deeply cleft (U-shaped) with few denticle-like protuberances; (ii) the lateral margin of mandibles with a cluster of thin, long setae medially; (iii) gill I single lamellate, basal half broader and tapered to apex; (iv) median projection of dorsal lamella of gills IIVII plate-like and markedly larger and longer than laterals, ventral lamella small, trifurcated and (v) abdominal segments IIIX with posterolateral spines progressively longer posteriorly. Distribution and habitat ecology of the new species are provided.

A new record and new species of Procloeon (Procloeon) Bengtsson, 1915 (Ephemeroptera: Baetidae) from the Western Ghats, peninsular India.

A new species Procloeon (Procloeon) kottagudiensis sp. nov. is described based on larva and adult characters from a submontane stream of the Western Ghats, peninsular India. Diagnostic characters, distribution and habitat ecology of the described species are provided. Keys for the known larvae and male imagos of Oriental Procloeon (Procloeon) are provided.

Description of the male and female adults of Sparsorythus srokai Srinivasan et al. (Ephemeroptera: Tricorythidae) from India.

Sparsorythus srokai is known from larva and eggs from the Western Ghats (Veerapandi River, Theni district, Tamil Nadu), India. The unknown adult stage (male and female subimagoes and imagoes) is described herein. An additional locality and its habitat ecology are also given for the species.

A new species of Sparsorythus Sroka amp; Sold, 2008 (Ephemeroptera: Tricorythidae) from Western Ghats, Southern India.

A little stout crawler mayfly Sparsorythus nanjangudensis sp. nov., is described based on nymphs and male adult from Western Ghats, southern India. The new species is differentiated from all known species on the basis of the extended anterolateral margin of pronotum, absence of subapical teeth on claws and wing pads reaching abdominal segment III. Distribution and ecological notes are provided for the new species.

A new species of Caenis Stephens, 1835 (Ephemeroptera: Caenidae) from Tamil Nadu, Southern India.

A new mayfly species Caenis maduraiensis sp. nov. is described and illustrated from nymph and adults collected from lentic habitat around Madurai. The nymph can be distinguished by the following characters: anterior margin of labrum with row of bipectinate setae longer laterally and a group of highly fringed setae behind emargination; and hind claw long, slender and hooked with row of denticles. Adults are characterized by prosternal triangle with slightly concave sides, tip acutely pointed; apical part of forceps abruptly narrowed to the tip, with a long apical spine, and few trichomes on surface.

A new mayfly Thraulus species (Ephemeroptera: Leptophlebiidae) from Peninsular India.

A new mayfly species Thraulus thiagarajani sp. nov. is described and characterized by dorsal lamella of abdominal gill I lanceolate, lamella of gills II- VII subequal to or slightly larger than dorsal lamella; posterior margin of labrum not strongly convex. Imago of the species with patterned femora and tergum. Hind wings have no coloration at base, much smaller than forewing. Costal projection is present at 0.6 of hind wing.