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The Philippine Journal of Science 



This species is nearest to T. quinquenotata Stal, but the latter 

 is a smaller species, and apart from other differences, has the 

 head narrower than the pronotum. 



Tettigoniella differentialis sp. nov. 



Pale green, legs white, vertex with a discal black spot and 

 head with 2 black dots on margin in front of eyes ; tegmina semi- 

 transparent with brownish veins, the milky white wings under- 

 neath giving them an opaque appearance. Length $ 7 mm. 



Length of face about once and a third width between eyes. 

 Outer genal margins strongly sinuate below eyes. Face strongly 

 swollen, the disc of front not at all flattened; lateral areas of 

 front with numerous darker transverse stripes. Face and vertex 

 finely shagreened. Head tumidly rounded in front, the vertex 

 strongly convex anteriorly, impressed across the base. Length 



of vertex about three-fourths 

 of width between eyes, an- 

 terior margin slightly swollen 

 just in front of eyes. Ocelli 

 just behind lines of anterior 

 margins of eyes, and much 

 nearer to eyes than to median 

 line. Pronotum with an 

 evenly curved transverse im- 

 pressed groove at anterior 

 one-fourth, back of this the 

 surface distinctly tranverse- 

 ly wrinkled. Scutellum very 

 short acuminate tipped, much wider than long, the width nearly 

 equal to length of pronotum. Last ventral segment of female 

 somewhat produced, the hind margin narrowly rounded. 



LUZON, Laguna Province, Mount Maquiling {Julian Valdez — 

 coll. Baker). 



This species is similar in coloration to T. unimaculata Sign., 

 but the black spot on the vertex is behind the middle and much 

 smaller, and the vertex is much longer. Tettigoniella unima- 

 culata is referred to Kolla by Distant while T. differentially 

 could not possibly be so referred. It does not appear from the 

 descriptions given that T. tmimaculata of Distant is at all that 

 of Signoret. Distant does not attempt to define the limits of 

 variability of the species, as he determines it. Nor does it 

 appear that the reference of T. hinbergi to unimaculata is at all 

 final. Stal noted the resemblance, but considered them distinct. 



Fig. 11. Tettigoniella differentialis sp. nov. 



