2o8 HOMOPTERA 



6. nuwarana Distant, Faun. Brit. Ind. App. 174. 3382 (1916). Ceylon, Nuwara. 



7. palhscetis Distant, Faun. Btit. Ind. App. 173. 338i (1916). Ceylon, Nuwara. 



8. rubronigris Funkhouser, Notes d'Ent. Chinoise V : 2. 17 (igSS). — China, T' ienmu Shan. 



Pl. II, fig. 175, 



9. sdlatus Uhler, Proc. U. S. Nat. Mus. XIX : 284(1896). Japan. 

 10. viiulus Lindberg, Pal. Cic. 23 (1927). Russia. 



201. GENUS TRICENTRUS STAL 



Trlcentrus Stal, Analect. Hem. 387 (1866). 

 Megalosoheina Buckton, Mon. Memb. 23i (igoS). 

 Otarls Buckton, Mon. Memb. 249 (i9o3). 

 Taloipa Buckton, Trans. Linn. Soc. Lond. IX : 334 (igoS). 



Characters : This genus belongs to a very interesting group of which species are found both in 

 the Centrotini and in the Gargarini in which the hind trochanters are armed with strong teeth on their 

 internal margins. Tricentrus has the posterior process simple, well developed suprahumerals of various 

 types, and the apical veins of the tegmina straighl. Various attempts have been made to subdivide 

 this genus, particularly on the basis of differences in the shape and structure of the pronotal horns, but 

 none have proven satisfactory. We can find no constant character which would warrant the splitting 

 off of other genera from this large genus or even the erection of subgenera. Because of the consider- 

 able amount of variation within the genus, the characters must be stated in rather general terms. 

 Those characters which seem always to be present and by which the genus may be recognized are as 

 follows : Head subquadrate, wider than high; base arcuate; eyes globular; ocelli prominent, equidistant 

 from each other and from the eyes and situated above a line drawn through centers of eyes ; inferior 

 margins of genas sloping and sinuate; clypeus extending for half its length below the inferior margins 

 ofthegense. Pronotum convex with well developed suprahumerals; metopidium vertical or sloping, 

 usually wider than high; humeral angles strong and triangular; median carina percurrent; suprahumeral 

 hoins varying greatly in size, length, position and structure, but usually strong, simple and extending 

 outward and upward; posterior process strong, impinging on tegmina, generally tectiform and fairly 

 straight with the tip sharp and extending a little beyond the internal angles of the tegmina; scutellum 

 broadly exposed on each side. Tegmina hyahne or subhyahne with the base narrowly coriaceous and 

 punctate; veins strong; five apical and two discoidal cells ; tip pointed; apical limbus well developed. 

 Legs simple but with the hind trochanters armed with teeth on the inner margins ; femora cylindrical ; 

 tibiffi triquerate and closely, finely spined ; hind tarsi longest. 



Type convergens Walker. 



Geographical distrlbution : This is one of the largest of all of the membracid genera with 

 species distributed over practically all parts of Asia and the South Sea Islands. 



1. acer Walker, List Hom. B. M. Suppl. i63 (i858). Malacca, Papua. 



2. acuticornis Funkhouser, Phil. Journ. Sci. XV : i. 22 (1919). Philippines, Panay, Culasi, 



Sumatra. 



3. teneus Distant, Faun. Brit. Ind. App. 167 (1916). India, East Himalayas, Dar- 



jeeling, Assam, Bengal.Ten- 

 asserim, Myitta, Malaya. 



