54 The Philippine Journal of Science 1915 



carina, which gives in a remarkable fashion an appearance in 

 the front view of a continuous lateral margin. This is shown 

 in the figures of the accompanying cuts. 



The species group out as Stal suggests, even when various 

 other important characters besides those used by him are taken 

 into consideration. The upper extension of the lora furnishes 

 a character peculiar in the two groups of species. Less clear, 

 but still characteristic, is the form of the lower margin of the 

 antennal cavity between the lora and the eye. In Jassus ob- 

 scurus and /. conspersus this is more or less distinctly carinately 

 margined and is slightly curved toward the antenna, making 

 the lower point subacute where it joins the lora. In J. luzon- 

 ensis and J. philippinensis there is no carina, the lower margin 

 of the cavity being curved away from the antenna, making the 

 cavity broadly rounded below. Jassus dubia Walk., described 

 from the Philippines, is unknown to me, and unrecognizable on 

 account of the inadequate description. 



Synopsis of species of Jassus known frotn Luzon. 



a\ Vertex longer than width between eyes and longer than pronotum; 



clypeus very strongly broadened apically; tegniina without a costal 



transparent spot; acute upper tip of lora falling far short of reaching 



antenna. 



6\ Pronotum and tegmina clear black, vertex piceous; face clear dark 



brown; hind margin of last ventral segment of female truncate 



medially, slightly incurved laterally obscurus Stal. 



b\ Pronotum and tegmina brown and thickly yellow granulate, the vertex 

 yellow; front yellow, laterally brownish to reddish; hind margin 

 of last ventral segment of female subtruncate medially, very strongly 



and suddenly bisinuate laterally conspersus Stal. 



a'. Vertex shorter than width between eyes and shorter than pronotum; 



clypeus not very strongly broadened apically; tegmina with a costal 



transparent spot; acute upper tip of lora reaching antenna. 



6\ Tegmina thickly yellowish granulate and without discal yellowish 



spots; front brown, thickly yellow-dotted; ocelli nearer to eyes than 



to median line ; scutellum small ; hind margin of last ventral segment 



of female strongly produced, medially broadly emarginate, angles 



of emargination acute luzonensis sp. nov. 



5'. Tegmina without yellowish granulations, but with several discal yel- 

 lowish spots; front brownish, lower two thirds medially yellow- 

 ish; ocelli nearer to median line than to eyes; scutellum very large; 

 hind margin of last ventral segment gently sinuate. 



philippinensis Stal. 



Jassus obscurus Stal. 



This large species, with tegmina unicolorous blackish, and 

 with under parts unicolorous brownish, is the most readily 

 recognized species in this region. The propleura, below the 

 carina, presents a remarkable character in that the anterior 



