Al'HIUrii.Ti OF FOEMOSA. 13 



apices black ; tarsL liack. Bl-lIj with many ratlior louti;, \-er}- stout iiorinal 

 bristles. Head with some longer bristles. Frontal tuljeicles moderately deve- 

 loped, uot convex on the inner side. Autennie slender, with some rather long 

 stout bristles, some of which are slightly knobbed ; the 1st joint much larger 

 than the 2nd ; the 3rd provided with about 20 small circular sensoria scattered 

 over the basal half ; the 4th somewhat imbricated, lacking sensoria ; the rela- 

 tive length of joints as follows: III-lOO, IV-53, V-SO, VI-135 (20 + 

 115). Eosti'um reaching the Mud cox:o. Cornicles cylindrical, large, stout, 

 dilated at the base, imbricateJ, reticulated on the distal one-fifth, about 4.5 

 times as loug as wide, a little shorter than the 3rd anteunal joint, aljout 2.2 

 times as loug as the cauda, almost reaching the caudal apex. Cauda large, 

 rather stout, with many long bristles. Legs slender, i3rovided with many 

 rather loug stout bristles. 



Length of body ^2.5 mm. Auteuua^2.7 mm. 



Cornicle — -0.7 mm. 



Host. — Gnapliulima mulUceps. 



Distribution. — Formosa : Kwaushirei. 

 North America. 



Collected by the author in March, 1921. 



Hithei-to um-ecorded fi'om Formo.sa. 



Macrosiphuin rosae L? 



(PI. II, B, figs. 2-3) 



Wingless viviparous female. 



Groen. Antenna; yellowish brown, apices of the 3rd, 4th and 5th joints, 

 and the 6th black. Eyes aud cornicles black. Cauda yellow. Legs yelk.^vish 

 bro^\ u, apical halves of femora and tibiffi, aud tarsi black. 



Body as in Macrosiphum rosae L. in general appearance, provided with 

 some short stout setio. Head provided with some k.uger setiB. Frontal 

 tubercles large, somewhat convex on the inner side, where 4 setfe are present. 

 Antenna) long aud slender, with some moderately long set;e ; the 1st joint very 

 large, slightly augulated on the inner side ; the 3rd not imbricated, provided 

 ^vitli 4—7 small circular seusoria almost in a smgle row near the base; the 



