86 EUMASTACIN^. 



Length 32 mm. ; prouotum, 12 mm. 



Ceylon, 



Type in the collection of Bruuner von Watteuwj 1. 



Group II. ERIANTHINI. 



Key to the Geneva. 



Fastigium of the vertex raised ; vertex viewed 



from the front acuminate or bifid Eeianthus, p. 86. 



Fastigium of the vertex horizontal ; vertex 



viewed from the front truncate Bennia, p. 91. 



Genus ERIANTHUS. 



Erianthns, Stal, Bih. Svensk. Aliad. Handl. iii (14), 1875, p. 36; 

 Brnnner, Abh. Senckenb. Ges. xxiv, 1898, p. 2:^1 ; Burr, Gen. 

 Ins., Orth. Eiimast. 1903, pp. 6, 7 ; Saussure, Rev. Suisse Zool. 

 xi, 1903, pp. 75, 77. 



Type, Masia.v guttata, Westw. 



Range. The Indo-Malayau Region. 



Tastigium of the vertex erect, tapering, with the tip straight or 

 slightly reflexed, and obtuse ; front flattened, rugose, with a 

 smooth dilated ridge between the antennae. Pronotum smooth, 

 slightly raised, truncated in front, obtusely produced behind, and 

 longitudinally carinated. Tegmina narrow, broader to^vards the 

 extremity, with a few veins, and more or less subhyaline. Wings 

 triangular, subhyaline, not longer than the tegmina. Femora 

 slightly compressed, carinated above, and produced into a tooth 

 behind ; hind femora slender, serrated above ; hind tibije with 

 from 20-25 equal spines on the inner carina, and 25 on the outer ; 

 first joint of hind tarsi sulcated above, and dentated on the outer 

 carina. Abdomen with the eighth segment expanded in the male, 

 and the anal appendages very large ; in the female bifid at the 

 extremity, and grooved on each side ; lower valves with the basal 

 plates smooth and punctured, and the upper border dilated. 



Key to the S2)ecles. 



1 (4) Vertex bifid or (in a supposed variety 



of the male) truncate. 



2 (3) Wings of ordinary form (>^''>s, Vs'eatw., p. 87. 



3 (2) Wings strongly sinuated apically, the 



apex itself very acute bi/ichis, sp. n., p. 87. 



4 (1) Vertex not bifid. 



5 (8) Vertex pointed, subrefiexed. [p. 89. 



6 (7) Tegmina acutely pointed aotfipenju's, Sauss., 



7 (6) Tegmina obtusely pointed ijuttatus, Westw., p. 88. 



8 (5) ^"ertex more or less rounded. 



9 (10) Wings brown hir/uoris, Brunn., p. 89. 



10 (9) Wings more or less yellowish hyaline. 



