Lestage 1927 : 118 Banks, 1920 : 325 Discovery of Indosialis from China, with description of one new species (Megaloptera: Sialidae) Liu, Xingyue Yang, Ding Hayashi, Fumio Zootaxa 2006 1300 31 35 54C9 2597562 Lestage Lestage [351,573,633,659] Insecta Sialidae Indosialis Animalia Megaloptera 1 32 Arthropoda genus     Indosialis  Lestage 1927: 118. Typespecies:  Protosialis minora  Banks, 1920: 325, by monotypy.  General characters. Small sized (forewing length 8–9 mm). Body yellowish or orange except for abdomen much darker. Wings grayish brown.  Head subquadrate, smooth and subshining, without raised scars. Male compound eyes distinctly prominent. Antennae filiform, scape distinctly inflated, pedicel shortened. Clypeal margin slightly prominent medially. Labrum suboval with anterior margin slightly incised. Prothorax rectangular, twice as wide as long; meso­ and metathorax slightly wider than prothorax. Wings suboval; forewing about thrice as long as wide, with costal region feebly dilated. Costal region with basal cross veins distinct but with apical cross veins nearly lacking; R 2+ 3 2­branched, R 4+ 5 2­branched; 3cross veins between R 1and Rs; M 1+ 2and M 3+ 4simple. Male ninth sternite broad, posteriorly produced more or less; male tenth tergite short, paired, subtriangular, with inner portion connected by membrane; male ninth gonostylus robust with rounded tip; male tenth sternite strongly sclerotized, with base expanded as wide plate, and with distal half divided into pair of elongate spinous lobes. Female unknown.   Distribution.The genus is distributed only in Yunnan Province of Chinaand Singapore. Remarks.  Indosialisappears to be closely related to  Protosialisin having the similar orange body coloration, the distinctly prominent compound eyes of the male, the feebly dilated costal area, and the bifurcated R 2+ 3and R 4+ 5, but can be easily separated from  Protosialisby the simple M 3+ 4. In  Protosialis,the M 3+ 4is bifurcate. Furthermore, this genus also somewhat resembles the fossil genus Eosialisin having the similar venation, but the shape of the wings is suboval, which is distinctly different from the narrow elongate wings of Eosialis( Nel et al. 2002).