64 R- Takahashi 



Myzocallis formosanus n. sp. 



(PI. X, A, fig. 3) 



Winged viviparous female. 



Yellow. Eyes red. Antennae black. Frontal tubercles dusky. Head and 

 prothorax each with a broad longitudinal dusky stripe on the dorsum. Mesothorax 

 darker, with a few dusky strijxjs. Most of the abdominal segments with a pair ol' 

 dusky markings on the dorsum. Cornicles, cauda and anal plate somewhat dusky. 

 Legs dusky. Wings hyaline, sometimes slightly dusky, scarcely clouded along the 

 veins. (Colour notes from specimens preserved in alcohol). Body oblong, with a 

 few short hairs. Head somewhat protruding al)ove the front ocellus, with a pair of 

 inconspicuous blunt tubercles between the frontal tubercles, from each of which a 

 siiort hair arises. Frontal tubercles very short. Eyes normal. Antennae long and 

 very slender, with a few very small hairs; the 1st joint much larger than the 2nd; 

 the 3rd furnished with 3-5 rather small to medium-sized oval sensoria arranged in a 

 .single row near the base; the 4th without sensoria; the relative length of joints about 

 as follows: III-llO, IV -77, V-69, VI-84 (43+41). Rostrum very short, reaching 

 the front coxae. Abdomen without distinct tubercles. 



The 2nd oblique on the front wings somewhat curved; the 3rd normal; stig- 

 matic vein Pome^\hat obsolete; hind wings with 2 slightly divergent obliques; hook- 

 lets 2. Cornicles very short, much shorter than wide at midlength, somewhat 

 expanded at the base. Cauda constricted at the base,' with some very long bristles. 

 Anal plate bilobed, with some very long bristles. I^egs slender, with many moderate 

 to rather long bristles; tibiae stouter than the 3rd antennal joint; hind tarsi slightly 

 shorter than the basal two antennal joints taken together. 

 Length of body-abont 2.0 mm. Antenna-about 1.8 mm. 

 Fore wing-about 2.5 mm. 



Hofit.- Arundinaria sp., attacldng the lower surfxee of the leaf. 



Distribution-Formosa. 



Some viviparous females were collected by the author on Deceml)er 2, 1923. 

 This species differs from MyzocaUin arundinariae Essig and its allies in the follow- 

 ing characters: 

 ( 1 ) Head protruding above tlie front ocellus, with a pair of inconspicuous blunt 



tubercles between the frontal tubercles. 

 ( 2 ) Cornicles shorter. 

 ( 3 ) Legs dusky. 



This aphis is distinguishable from 31. scaae Mats, by the antennal structure. 



