' 3 < A Baker: Malayan Jassoidea 379 



b\ Sides of vertex strongly sinuate at middle of anteocular length; front 

 with sides strongly incurved on basal half; lateral margins of 

 front distant from the small eyes; brachypterous. 



Didius Distant." 



b\ Sides of vertex never strongly sinuate; front never with sides strongly 



incurved on basal half; lateral margins of front not far from the 



large eyes; all macropterous. 



c\ Ocelli distinctly nearer to each other than distance between eyes; 



medial cell strongly broadened apically, the sides never strongly 



incurved; vertex as long as, or usually shorter than, anteocular 



, Wldth - Kana Distant 



c Ocelli as far apart as distance between eyes (rarely a little less) 

 or farther; medial cell usually strongly narrowed apically, the 

 sides more or less incurved ; vertex as long as, or usually somewhat 

 longer than, anteocular width. 

 d 1 . Front depressed only apically; face above full and evenly convex, 

 the oblique lateral folds low, broad, and indistinct; basal portion 

 of median frontal carina not strongly raised.. Nirvana Kirkaldy. 

 tf. Front depressed throughout or largely so; the narrow upper 

 portion with conspicuous sharp oblique lateral folds; basal por- 

 tion of median frontal carina more or less sublaminately raised. 

 e 1 . Upper portion of disk of front without a strongly raised de- 

 limiting carina; length of vertex rarely as great as one and 

 a half times anteocular width; ocelli rarely partial i; 

 in facial view. 

 p. Vertex with the bordering carina weak and low, sinuate or 

 obsolete at position of ocelli, which are raised on the rounded 

 lateral margin so as to be plainly visible in lateral view; 

 outline of vertex subtriangular with more or less strongly 

 ; cephalad from very near eyes. 



f. Vertex with the bordering carina strongly, thinly extended 

 and raised, making the disk of the vertex rather strongly 

 concave and usually hiding the ocelli in lateral view; outline 

 of vertex broadly elliptical, usually equally broad for some 



distance in front of eyes Ophiuchus Distant. 



e\ Upper portion of disk of front with a strongly raised and 

 sharply delimiting carina; length of vertex more than twice 

 anteocular width; ocelli clearly visible in facial view. 



Nirvanoides g. nov. 



a". Interocular portion of vertex with parallel sides; vertex narrow, width 



between eyes less than half width of pronotum, the latter strongly 



narrowly rounded anteriorly. 



b\ Vertex long, not broadened in front of eyes; clypeus suddenly narrowed 



to a rounded apex; lorae very short; face far longer than broad; 



head much narrower than pronotum; apical cells long and narrow, 



venation distinct throughout Pythonirvana g. nov. 



6'. Vertex short, broadened in front of eyes; clypeus very gradually 

 narrowed to a subtruncate apex; lorae narrow, but long; face as long 



81 Didius is provisionally placed in this subfamily. 



