370 "The Philippine Journal of Science wis 



characters may, however, be deduced from the table given 

 to be as follows: Bilobed posterior process, foliaceous tibiae, 

 sides of thorax armed with spines, horns present above lateral 

 angles. Later in the same year * Stal designates as the type 

 of the genus Westwood's old species (Centrotus) horrificus, 

 which Walker had incorrectly placed in DeLaporte's genus 

 Pterygia of the subfamily Membracinse.^ In the Hemiptera 

 Philippinarum ® this species is given as the only species in the 

 genus. The genus has remained monotypic. 



The single species of the genus bears a strong superficial 

 resemblance to the forms of the genus Pterygia, but may im- 

 mediately be distinguished by the well-developed and plainly 

 visible scutellum, which places it at once in another subfamily. 

 The genus may be characterized not only by the foliaceous tibise 

 and toothed thorax as described by Stal, but also by the most 

 remarkable development of curious spines and tubercles over 

 the surface of the pronotum. These bristling spines are of 

 various shapes, lengths, and colors and give to the insect a 

 decidedly terrifying aspect. 



Centrochares horrificus Westw. Plate I, fig. 1. 



Centrotus horrificus Westw., Proc. Zool. Soc. (1837), 130; Guer., Mag. 



Zool. (1841), II, 3, PI. 82; Lefebvre, Bull. Ann. Soc. Fr. (1842), 21. 

 Pterygia horrificus Walk., List Horn. Brit. Mus. (1851), 500; (1852), 



4, Tab. 4, figs. 4 and 5. 

 Centrochares horrificus Stal, Analect. Hem. (1866), 386; Stal, Hem. 



Phil. (1870), 731; Buckt., Mon. Memb. (1903), 266; Funkh., Journ. 



Ent. & Zool. (1914), 6, 69. 

 Pterygia horrifica Buckt., Mon. Memb. (1903), 73, PI. XII, fig. 5. 

 Pterygia postica Buckt., Mon. Memb. (1903), 70, PI. XI, figs. 4-5a. 

 Pterygia spinula Buckt., Mon. Memb. (1903), 73, PI. XII, fig. 4. 



Centrochares horrificus is readily distinguished from all other 

 membracids thus far described from the Islands on account of 

 the peculiar bristling spines, which are not found on any other 

 species. The insects vary considerably in size and color. The 

 males are usually smaller and darker than the females. 



I believe Buckton's two Philippine species. Pterygia postica '' 

 and Pterygia spinula,^ are both Centrochares horrificus. It 

 seems incredible that the subfamily Membracinse should be 

 represented in the Islands by these two species only, and it is 



'Ber. ent. Zeitschr. (1866), 10, 386. 



= Cat. Horn. Brit. Mus. (1851), pt. II, 500. 



"Stal, Oefver. Kongl. Vet. Akad. Forh. (1870), 731. 



'Mon. Memb. (1903), 70. 



' Ibid., 73. 



