Apliitlulae of Formosa 4. f) 



SOME FORMOSAN APH1DIDAE 



Macrosiphum sp. 



An apterous form parasited by ;i Hymenoptera was observed by the author 

 at Tattaka in Taiclm-prefecture, Formosa, in May 1924. 

 Hoct — Le.spedeza sp. 

 Hitherto unrecorded from Formosa. 



Macrosiphum rosaefolium Tl b. 



(Pi. 1. B, figs. 1-2). 



Bull. Ent. Research, vi, pt. 2, p. 109 (1915). 



Wingless viviparous female 



Green. Cornicles greenish, with the tips somewhat dusky. Cauda greenish. 

 In a specimen treated with caustic potash, antennae almost dusky, paler at the 

 base of the 3rd joint; apices of femora and tibiae, and tarsi dusky. Body 

 without distinct hairs. Head with a short wide tubercle at the middle of the 

 front, provided with a few very small hairs on the dorsum. Frontal tubercles 

 distinct, moderately convex on the inner side Antennae almost as long as the 

 body, imbricated, provided with a few very small hairs ; the 1st joint somewhat 

 convex on the inner side; the 3rd furnished with 8 or II small circular sensoria 

 arranged in one single row almost over the basal three-fifths; the 4th without 

 sensoria: the relative length of joints about as follows: [11-136, IV-95, V-78, 

 VI-132 (32+100). Rostrum reaching beyond the middle coxae. Abdomen 

 furnished with a few short setae. Cornicles long, rather slender. Cylindrical, 

 somewhat expanded toward the base, not dilated at the base, slightly or scarcely 

 curved, imbricated, not reticulated, about 1.5 times as long as the cauda, almost 

 as long as the 3rd antennal joint. Cauda long, stouter than the cornicle, very 

 slightly shorter than the 4th antennal joint, provided with 2 pairs of lateral 

 bristles and a much shorter bristle near the tip. Legs long and slender: tibiae 

 stouter than the 3rd antennal joints, but more slender than the cornicle, with 

 many moderately long setae: front tibiae much longer than the cornicle; hind 

 tarsi almost as long as the basal part of the last antennal joint. 



Length of body-about 2.3 mm. (not including the length of cauda). 



Antennae — about 2.4 mm. Cornicle — about 0.65 mm. 



Host — Rosa sp. 



