Aphididae of Poruiosa. — I. Yl 



sliurt hairs. Fore wings witli typical veins, stigmatic vein being 

 obsolete; hind wings with 2 obliques slightly divergent; booklets 2. 

 Length of body — 1.7 mm. Antenna — 1.6 mm. 

 Fore wing — 2.0 mm. Width of fore wing — 0.9 mm. 



Host. — Dendrocalamus laiiJlo7'us. 

 Distribution. — Formosa (Taihoku). 



Like other species of Myzocallis, this interesting aphis is sporadic 

 in habit, and jumps from the host when disturbed. 



Jlyzocallls pscudoabil n. sp. (PL. vii, 1, hgs. 1-5). 

 Winged viviparous female. 



/^ Yellow. Eyes red. Antennae yellow; apices of the 3rd, 4th and 

 5tli joints, and the 6th, as well as the middle part of tlie 3rd, dusky. 

 Dorsal tubercles on the abdomen concolouruus witli the l:)ody, but that 

 on the 2ud abdominal segment at the apex dark and that on the 5th 

 blackish. Cornicles yellow, the apices black. Cauda yellow. Wings 

 along the veins clouded; stigma pale brown; veins brown or black. 

 Legs yellow. Body furnished with a few hairs. Frontal tubercles 

 very short. Antennae very slender, with a few very short hairs; the 

 3rd joint near the base provided with 6-7 small circular sensoria in a 

 row; the 4th very slightly imbricated, without sensoria; the relative 

 length of joints as follows: III-70, IV-44, V-43, VI-36 (16 + 20). 

 Rcjstnmi not reaching the middle coxae. Abdomen on each side 

 with several very short blunt inconspicuous tubercles and along the 

 longitudinal axis of the dorsum 4 large finger-like tubercles, of which 

 the 1st 2 are subequal in size, the 3rd a little shorter than the 2nd, 

 and the last the smallest. Cornicles much longer than wide, slightly 

 constricted at midlength. Cauda globular, constricted at the base. 

 Anal plate bilobed. Legs long and slender, with many short hairs. 

 Wings rather narrow; veins normal; booklets 3. 



Length of body — 2.0 mm. Antenna — 2.0 mm. 



Fore wing — 2.6 mm. Width of fore wing — 0.9 mm. 



