98 The Philippine Journal of Science 1917 



Genus ACANTHOCERA Melichar 



Acanthocera punctifrons Melichar. Plate I, fig. 3. 



Acanthocera punctifrons Melichak, Phil. Journ. Sci., Sec. D (1914), 

 9, 436, PI. I, figs. 5-8. 



The Los Baiios specimens that I identify as of this species 

 agree in specific characters with Melichar's description of 

 Acanthocera punctifrons, but differ generically. The subcosta 

 reaches the costal margin near apex, a folding under of the 

 costal membrane giving it the appearance of Melichar's figures ; 

 the first median sector is attached to the cubital system, but 

 not so distinctly as in Paraproutista, the second free sector is 

 furcate, the clavus is open; this is the same tegmen as that of 

 Paraproutista. 



In the female the genital styles (ovipositor and sheath) are 

 abortive as in Proutista, Paraproutista, Neocamma, and the 

 Sikaianini. 



In the male the ventral edge of pygophor is straight ; a trian- 

 gular projection arising from the inner surface fits perfectly 

 between the genital styles, lateral edges entire; anal segment 

 longer than broad, anus in basal third, beyond anus the segment 

 curves ventrad and narrows to the truncate apex; genital 

 styles broader than long, broadest at apex, which is slightly 

 sinuous, ventral margins fitting against angular projection from 

 pygophor. 



Genus SIKAIANA Distant 



This and three allied genera form a small tribe of minute, 

 delicate derbids closely allied to one another. Although they are 

 rare in collections, yet they are abundant in their habitats ; they 

 most frequently rest upon the underside of leaves of various 

 species of palms. In all the species with which I am acquainted, 

 the anal area of the wing is large and is modified into a stridulat- 

 ing organ, the rest of the wing is small or minute. Whether 

 these groups should be considered as genera or subgenera is a 

 point on which homopterists may not all agree, but it is ex- 

 pedient to recognize the character upon which they are founded. 



Sikaiana makii Muir. 



Sikaiana makii MuiR, Proc. Hawaiian Ent. Soc. (1915), 3, 117. 



One female agrees with the description of this species, but 

 a male is required to make the identification definite. 



Luzon, Laguna, Mount Maquiling (Muir), on palm trees. 

 Formerly only known from Formosa. 



