50 K. Takahashi. 



segments are provided with wax-pores on the side. The outlines of these pores 

 are indistinct. 



Cerataphis bambusifoliae n. sp. 



(PL III, B, figs. 9-10). 

 Wingless viviparous female 



Black, with white wax on the whole margin of the body. Body about 

 1.4 times as long as wide, with a few very small hairs on the dorsum of the 

 abdomen. Wax-pores very elongate, arranged in a single row on the whole 

 margin of the body, about 270-280 in number. Head on the ventral surface 

 between the antennae with '■) pairs of short liristles each arising from a minute 

 tubercle, of these tubercles the hind pair the largest and the middle the smallest. 

 Horns rather small, modi lately expanded towards the base, with the tip rounded, 

 almost united on the basal half, almost as long as the 4th antennal joint. Eyes 

 small, composed of 3 facets. Antennae short, rather slender, 5-jointed, with a 

 few bristles; the 3rd joint almost as long as the basal 2 joints taken together, 

 without sensoria : the 4th somewhat narrowed towards the base, the sensorium 

 very small; the relative length of joints about as follows: [11-20, IV-13, V-28. 

 Rostrum very stout, nearly reaching the middle coxae. Abdomen provided with 

 a few bristles around the cornicle and some moderately long liristles on the 

 hind portion of the venstral surface. Cornicles small, represented almost by 

 pores. Cauda much wider than long, constricted at the base, almost as wide as 

 the lobe of the anal plate, much larger than the cornicle, with some very long 

 bristles, of which one pair is much longer and stouter. Anal plate bilobed, with 

 some very long bristles. Legs short, with some rather long bristles; tibiae 

 stouter than the antenna, hind tibiae almost as long as the antenna ; hind tarsi 

 slightly shorter than the 5th antennal joint. 



Length of body — about 1.9 mm. 



Host. — Bambusa sp., attacking the leaf and stem. 



Distribution. — Formosa; Hori in Taichu-prefecture. 



Many wingless viviparous females were collected by the author on May 

 23, 1924. 



Of the wax-pores on the margin of the body, those on the middle portion 

 of the body are more elongate. This species may be easily distinguished from 



