290 HOMOPTERA 



2. petspicillaris Germar, Rev. Silb. IV : 73 {i836). Afiica. 



3. sobrina Stal, Ofv. Vet. Akad. Forh. 97. i (i855). Africa, Caffraria. 



patruelis Stal, Ofv. Vet. Akad. Forh. 98. 2 Ci855). 



290. GENUS HEMICENTRUS MELICHAR 



Hemicentnus Melichar, Notes Mus. Leid. 114 (1914). 

 Sarritor Distant, Faun. Brit. Ind. App. 182 (1916). 



Characters : The presence of suprahumeral horns and the absence of a posterior process 

 provide a combination of characters which at once distinguishes this genus not only from the other 

 genera of the tribe but from any other genus in the subfamily. Head subquadrate, smooth, twice as 

 broad as high; base arcuate and weakly sinuate; eyes very large, globular and protruding; ocelli large, 

 conspicuous, equidistant from each other and from the eyes and situated above a Hne drawn through 

 centers of eyes; inferior margins of genaesloping and weakly rounded ; clypeus three times as long as 

 wide, extending for two-thirds its length below inferior margins of genae, tip rounded and pilose. 

 Pronotum convex, gibbous, with strong suprahumerals but no posterior process; metopidium vertical, 

 about as broad as high ; median carina strongly percurrent; humeral angles large, subconical and sharp ; 

 suprahumeral horns varjing considerably among the different species in size and structure but usually 

 heavy, tricarinate, somewhat fiattened dorso-ventrally, at least twice as long as the distance between 

 their bases, extending outward and upward, tips blunt; no posterior process; scutellum entirely 

 exposed. subtriangular, about as broad as long, swoUen at the base, tip broadly bifurcate. Tegmina 

 long, slender, hyaline or subhyaline, usually much wrinkled; base coriaceous and punctate; veins 

 heavy; five apical and two discoidal cells ; tip rounded; apical hmbus narrow. Legs long, slender 

 and simple; hind tarsi longest. 



Type bicornis Melichar. 



Geographical distribution : The distribution of this genus seems to be limited to the south 

 Asiatic and Archipelagic region. 



1. actdeatus Olivier, Enc. Meth. VH : 669(1792). Ceylon. 



2. atUnuatus Funkhouser, Bull. Brook. Ent. Soc. XVI : 2. 5o (1921). China, Kiautschau. 



3. bicornis Melichar, Notes Mus. Leid. ii5 (1914). Java, Semarang. 



4. bispiiius Stoll, Cigal. 76 (1783). Ceylon. 



5. w?-««i?/s Funkhouser,Ann. Mus.Acad. U.S.S.R. XXVIII : i5o(i927). Indo China, Annam, Song 



Dinh. 



6. r«to!« Distant, Faun. Brit. Ind. App. 182. 3397 (1916). _ Pl. 14, Lower Burma, Moulmein, 



tig.zoT. Dawna Hills, Farm Caves, 



Java. 



