xv, 2 Baker: The Genus Krisna (Jassidse) 213 



All of this means that no sound classification of the species 

 (as in most jassids) can be based on colors, but that detailed 

 study must be made of all important features of the external 

 anatomy. Nor does it avail in the least to build up species de- 

 scriptions by repeating characters common to all or even part 

 of the species in the genus. All of these species are long oval 

 in outline and strikingly gyponoid in form, with the vertex very 

 bluntly angulated or rounded between the eyes (it may be quite 

 different in the sexes) ; the face and the vertex variously rugose 

 and wrinkled ; the pronotum, except anteriorly, thickly and finely 

 cross striate; the scutellum having a strongly curved discal 

 furrow, before which the surface is rugose, behind it, cross 

 wrinkled; and the tegmina more or less thickly punctate. The 

 number and the position of the supernumerary veins vary in 

 the same species. The pronotum always possesses a long, strong, 

 complete lateral carina. The frons is thickly rugose of varying 

 degrees of coarseness. The cheek is slightly roughened below 

 the eye, obliquely wrinkled on the middle third, and rugose 

 below. The clypeus and the lorse are more or less rugosely 

 roughened. The size is variable within narrow limits in all of 

 the species. 



Key to the species of Krisna. 



o\ Lower margin of transversely wrinkled ocellar area with several strong, 

 irregular, noncontinuous wrinkles of similar size, and with wrinkles 

 on supra-antennal area; frons below ocellar area not or only moder- 

 ately depressed; smaller species of slenderer form. 

 h\ Frons evenly convex from margin of vertex to clypeus; length of 



male, 8.5 millimeters K. minima sp. nov. 



b 1 . Frons distinctly depressed below ocellar area; size usually larger. 

 £. Vertex with but one irregular submarginal carina, distinct at least 

 at sides, the entire disk uniformly coarsely rugose. 

 cT. Supra-antennal carina passing on to frons in an even curve, or 

 for a short distance straight and then curved; tegmina trans- 

 lucent, the puncturation rather fine. 

 e\ Lateral carina of pronotum about same length as eye in lateral 

 view. 

 f. Supernumerary veins numerous; wings milky subhyaline; face 

 concolorous with remainder of undersurface. 



K. strigicollis Spin. 

 f. Supernumerary veins few; wings dark smoky. 



g 1 . Supra-antennal area as broad as long, face concolorous. 



K. simillima sp. nov. 



g\ Supra-antennal area longer than broad; frons black. 



K. nigrifrcms sp. nov. 



e 3 Lateral carina of pronotum distinctly longer than eye in lateral 



• pw K. penangensis sp. nov. 



