igS HOMOPTERA 



279 difterent species which at one time or another have been assigned to it of which only 40 now remain 

 and some of these are very doubtful as to their correct generic classification. 



The representatives of this genus are large, robust insects with strong suprahumerals and a more 

 or less straight, heavy posterior process which has a well developed inferior node. Other important 

 generic characters may be listed as follows : Head subquadrate, a httle wider than high, usually 

 pubescent; base arcuate ; eyes comparatively small andovate; oceUi large, prominent, somewhat farther 

 from each other than from the eyes and situated about on a Une drawn through centers of eyes; inferior 

 margins of genae sloping downward, weakly sinuate; clypeus extending for more than half its length 

 below the inferior margins of the gense, tip truncate. Pronotum convex with strong suprahumerals; 

 metopidium nearly vertical, about as broad as high; median carina percurrent; humeral angles large 

 and blunt; suprahumeral horns heavy, as long as the distance between their bases, extending outward 

 and upward, triquerate, tips pointed ; posterior process heavy, tectiform, arising from well above the 

 scuteUum, with a large inferior node which impinges on the tegmina, tip sharp and reaching just about 

 to the internal angles of the tegmina; scuteUum entirely exposed, heavy, triangular, tectiform. Tegmina 

 entirely free, broad, subhyaUne; base narrowly coriaceous and punctate; veins strong; five apical and 

 two discoidal ceUs; tip rounded; apical Umbus broad. Hind wings with three apical ceUs. Legs 

 simple; femora cyUndrical; tibiae triquerate and minutely spined; hind tarsi longest. 



Type cornutus Linnaeus. 



Geogpaphical distribution The wide distribution recorded for this genus makes one 

 suspicious that some of the species may not be correctly assigned, since widely separated regions of 

 Europe, Asia, Africa and the East Indies are included in the Ust of locaUties. If aU of the foUowing 

 species reaUy belong to Centrotus (which we very much doubt), this genus is the most cosmopoUtan of 

 aU of the membracid genera. Unfortunately many of these species have never been recognized since 

 their original descriptions and we can therefore only record them as they have been described until 

 further information is available. 



1. albigutta Walker, Journ. Linn. Soc. Zool. X : 184(1868). Indian Archipelago. 



2. albilatus Walker, Journ. Linn. Soc. Zool. X : 184 (1868). New Guinea. 



3. angustulus MeUchar, Hom. Ceylon 112. 8 (igoS). Ceylon. 



4. bantuautus Distant, Ins. Trans. i. 2i5 (1908). Transvaal. 



5. Wco/oy WaU<er, List Hom. B. M. 625. 63 (i85i). Unknown. 



6. bioculatus Kirby, Journ Linn. Soc. Zool. XXIV : 166 (1891). Ceylon. 



7. biturris Walker, List Hom. B. M. Suppl. 164(1858). New Hebrides. 



8. bovinus Distant, Rhynch. Notes 323 (1916). British East Africa. 

 g. colladoi Pelaez, Memb. Fernando Po 49 (1935). Fernando Po. 



10. constipaius Walker, Journ. I^inn. Soc. Zool. X : 192(1868). Indian Archipelago. 



11. cornutus Linnaeus, I^^auna Suecica 879 (1746). — Pl. I 0, fig. 16 1. Germany, Austria, Poland, 



itaUcus Kirschbaum, Cicad. 67 (i855). France, Italv, Spain, Portu- 



turcicus Kirschbaum, Cicad. 67 (i855). 



abbreviatus Kirschbaum, Cicad. 67 (i855). g^'' England, Finland, Rus- 



siculus Kirschbaum, Cicad. 66 (i855). sia, Siberia. 



gallicus Kirschbaum, Cicad. 67 (i855). 



u horucicade n Taschenberg, Beld. Ins. Libr. 541 (1861). 



dipressus Fieber, Rev. Mag. Zool. III : i5 (1876). 



obtusus Fieber, Rev. Mag. Zool. III : 19 (1876). 



rugosus Buckton, Mon. Memb. 243 (igoSj. 



12. difficilis Distant, Rhynch. Notes 3i (rgiS). Cape Colony. 



