Aphididae of Formosa.— 3. 91 



between the antennae and witli a few rather long fine hairs. Eyes eomposed of 3 

 facets. Horns rather stout, nearly finger-like in shape, with the apex rounded, 

 almost united at tlieir bases, al out as long as tlie 2nd antennal joint. Anten- 

 nae 4-jointed, provided with a few rather long hairs; tlie 3rd joint sonietinaes with 

 an indistinct constriction, with the apical sensorium quite small; the 4th about as 

 long aa the basal two joints taken together; the relative length of joints about as 

 follows: III-32, IV-29 (18 + 11). Rostrum very stout, reaching the middle coxae. 

 Thorax and abdomen well defined. Abdomen provided witli a few hairs. Cornicles 

 much larger than the wax-pore, sliglitly protuberant. Cauda wider than long, narrow- 

 er than the lobe of the anal plate, constricted at the base, furnished with some 

 very long bristles. Anal plate bilobed, with some very long bristles. Tibiae stouter 

 than the 3rd antennal joint, furnished with tome moderate to rather long hairs; hind 

 tibiae sliglitly longer than the antenna; hind tarsi as long as or slightly shorter than 

 the 4th antennal joint. Wax-pores oval, arranged in a single row along the whole 

 margin of the body, about 240 in number. 



Length of body-about 2.1 mm. Width of body-about 1.4 mm. 



Host.-Cbco.s up., attacking the young leaf. 



Distribution. -Formosa: Kuraru, Koshuu. 



Some wingless forms were collected by the author on November 20, 1923. 



This aphis differs from C lalancac Boisd. in the following characters: 



( 1 ) Body larger, provided with more wax-pores. 



(2) Horns on the head almost united at their bases, nearly finger-like in 

 shape, with the apex rounded, almost as long as tlie 2ud antennal j(>iut. 



(3) Rostrum longer, reaching the middle coxae. 



Cerataphis lataneae Boisd. 



Aphididae of Formosa-1, p. 91 (1921); Aphididae of Formosa-2, pi. IV, B, 

 fig. 1 (1923). 



Nymph. 



(The fii-st instar). Body not hard, rather flat, almost twice as long as wide. 

 Wax-pores circular, protuberant, arranged in a single row along the whole margin 

 of the body as in the adult of the wingless viviparous female. Head fused with the 

 prothorax, provided with a few short hairs on tlie dorsal surface and a pair of very 

 long bristles, which arc much longer than the horns, between the ant(!nnae on the 

 lower side. Horns rather stout, almost as long as the 1st antennal joint, sharply 

 pointed, expanded toward the base. Eyes of 3 facets. Antennae short, 4-jointed, 



