ADDITIONAL NOTES ON THE INDftAN SlpWplf.'bi%£lNOUs] 

 BY O. C. CHAMPI 



Since the publication of my accounf^-4 £^flfen iMjd^ La- l§pecies of 

 Bianoua (ante, pp. 41-55), my eldest son, H. Gr. C, has sent me 

 another consignment from Kumaon, mostly from a lower elevation and 

 a somewhat different district in the Himalaya, including three additional 

 forms, as well as a long series of Z). lohigerus (six only having been 

 sent previously), two more specimens of Z>. cyanogaster, and one of 

 D. cameroni. He also sends a fuller account of the places in which 

 these astonishing assemblages of so many species of Dianous have been 

 found, as well as notes on the habits of some of them. These notes 

 prove that the possession of long lobes to the fourth tarsal joint must be 

 of service to the species (Z). azureus and lohigerus) living at the lower 

 elevations where the fall is more rapid, enabling them to keep to the 

 surface of the water during floods, those inhabiting quieter spots in 

 the higher ground, D. aiuh-eivesi and others, having simple tarsi. Tlie 

 communication forwarded by H. G. C. is inserted in this paper after the 

 descriptions of the three new species. 



8 («). — Dianous azureus, n. sp. 



Robust, wholly caeruleous above and beneatli, the antennae and paljii 

 black ; shining, tineh^ cinereo-pubescent. Head rather small, closely pnuctured, 

 rapidly, obliquely narrowed behind the eyes, the latter prominent and not vevv 

 lav(fe, the intra-ocular grooves widely separated, shallow ; antennae long, about 

 reaching the middle of the elytra. Prothorax much narrower than the head, 

 as long as broad, sinuously narrowed posteriorly ; coarsely, closely, irregularly, 

 subconfluently punctate, the disc obliquely compressed on each side at about 

 the middle. Elytra large, subquadi-ute, as long as broad, nearly twice as wide 

 as the prothorax, rounded at the sides posteriorly ; closely, somewhat coarsely, 

 uniformly punctate (the punctures similar to those on the head), the disc slightly 

 depressed near the humeral callus. Abdomen closely, minutely, the sixth 

 dorsal segment more coarsely, punctate ; ventral segments uniformly punctate ; 

 aual brushes moderately long. Legs comparatively stout; fourth tarsal joint 

 furnished with two long lobes. 



S. Sixth ventral segment triangularly emarginate, the seventh sharply 

 dentate at each outer angle. Genital armatui'e : lateral lobes long, slender, 

 ciliate towards the apex within ; median lobe rapidly narrowed to a sharp point. 



Length 7-8 mm. (d $•) 



Hah. India, River Sarda Gorge, Tanakpur {H. G. C: xu.l918). 



Twenty-eight examples. Separable from the other described Indian 

 forms by its uniform brilliant blue colour, the comparatively small head 

 and eyes, the coarsely, irregularly punctured prothorax, the simply punc- 

 tured elytra, etc. The punctures on the elytra are coarser tnan in anv of 



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