56 The Philippine Journal of Science mi 



rri^. Eyes reaching margin of clypeus, reniform, anterior half equal 



in size to posterior half Nicerta. 



m^ Eye reaching not quite to base of clypeus, subreniform, anterior 



half much narrower than posterior half leptaleocera. 



l'. Eye in front not reaching nearly to base of clypeus.. ..Megatropis. ' 

 a". Media not separating from radius until after forking of subcosta and 

 radius. 



7i\ Subantennal process absent Heronax. 



«^ Subantennal process present JMtysidioides. 



Key to the genera of Philippine Derbinas. 



a'. Eyes in front not reaching to base of clypeus, subcostal cell long, some- 

 times very narrow (Derbini). 



6\ Shoulder keels large, subantennal process present Zeugma. 



b-. Shoulder keels not large, subantennal process absent. 

 c\ Antennse terete, subterete, ovate, or subovate. 



(f. Four cubital veins reaching hind margin, first median sector 

 included in cubital system; antennae large, longer than face 

 (female with genital styles normally developed) . 



e\ Hind edge of tegmen entire Zoraida. 



6". Hind edge of tegmen serrate Losbanosia. 



(P. Antennae short, not longer than face (female with genital styles 

 abortive). 

 /\ Clavus closed, claval suture and vein entering hind margin 

 (according to Melichar's figures) . 

 g^. Subcosta and radius separating near base, amalgamating at 



apex; clypeus large, carinas distinct Neocamma. 



g'. Subcosta and radius not amalgamated at apex; clypeus 



smaller, carinas indistinct Acanthocera. 



f. Clavus open, first claval vein extended to cubital system. 



h^. Media with 4 or 5 unbranched sectors Proutista. 



/l^ Media with 4 or 5 sectors, the second furcate (first true 



sector attached to cubital system) Paraproutista. 



c^ Antennje flattened (female with genital styles normally developed). 



z*. Basal fourth of costa arcuate Peggia.* 



i^ Basal fourth of costa not arcuate. 



f. Face very narrow, vertex not broader than long Peggiopsis. 



j.' Face nearly as broad as long, vertex broader than long..Mindana. 

 a^ Subcostal cell very short or absent; eyes in front reaching to base of 

 clypeus (female with genital styles abortive) (Sikaianini). 

 A;'. Cubitus arising from base of tegmen, basal median cell present. 



r. Basal median cell broad and short, not reaching halfway along 

 tegmen. 

 m^. Antennas much shorter than thorax and head together, cylindrical, 



slightly constricted about middle Sikaiana. 



m^ Antennje as long as head and thorax together or nearly so. 



Muirla. 

 P. Basal median cell very narrow, reaching to about middle of tegmen. 



Leomelicharia. 

 Ic'. Cubitus arising from media about one fourth from base....Distantinia. 

 * As I am in doubt as to this genus, I leave it distinct from Peggiopsis for the present. 



