It. TakahasVii. 



thidughout the year very coiiinioiily, winged males and wingless 

 oviparous females sometimes occurring as late as December. 



]n i^'ormosa the .species is very abundant from ])ecember to April 

 and is quite I'are during tiie summer, and the sexual forms do not 

 appear throughout the 3'ear. 



Jfacrosiphum (jigantcum Mats. (Trans. Sapporo Nat. Hist. See. 

 vol. vii. pt. I. i>. '1. 1918) seems to Iju identical with this species, 

 although its original description is too brief to decide tins positively. 



Macfoslphum formosamcm, n. sp. (PL. X. 2, figs. 5-8). 

 Jfacrosighitm picridis, ^kl, Agr. Expt. St. Formosa, IJull. H>o, 

 p. ii. (U) ](■.). 



Wingless viviparous female. 

 Red. JNletathorax and the 1st and 2nd abdominal segments 

 usuall}' l)lack. Eyes, antennae and cornicles black. Legs pale brown, 

 apical halves of femora, apices of tibiae, and tarsi black. Cauda 

 yellow. Body provided with a few stout capitate hairs; some hairs 

 on the head similar, longer. Frontal tubercles large, not convex on 

 the inner side. Antennae very long and slender, with a few capitate 

 hairs; the 3rd joint provided with about 80 small, protruding circular 

 sensoria scattered over the whole length ; the 4th joint somewhat 

 imbricated, lacking sensoria; the relative length of joints as follows: 

 111-142, IV-36, V-35, VI-1()4 (12 + '.)2). Rostrum reaching beyond 

 the middle legs. Cornicles cylindrical, long, about 1.5 times as long 

 as the Cauda, not reaching the caudal apex, almost as long as half the 

 3rd antennal joint; slightly expanded towards the base, imbricated, 

 distinctl}' reticulated on the distal one third. Cauda large, ensiform, 

 provided with about 8 pairs of long lateral bristles. 



Legs very long and slender, covered will 1 many moderately long 

 capitate liairs. 



Length of body — 3.0 mm. Antenna — 3.5 mm. 

 Cornicle — 0.8 mm. 



