90 K. Takahashi. 



towards the l)ase, and somewhat sharply pointed. Antennae 4 or 

 5-jointed, with long fine hairs; apical sensoria of the 8rd joint minute; 

 the relative length of joints as follows: I — '.). II — 8. Ill — 25, IV — 

 18. Rostrum uL-arl}' reaching the middle coxae. Abdomen broadest 

 between the cornicles. Cauda much wider than long, constricted 

 at the base. Anal plate bilobed, witli many long hairs. 



Legs rather long and slender, with many long hairs; the 2nd 

 tarsus long, with some very long hairs. 



Length of body — 2.2 nun. Antenna — 0.4 mm. 



Host. — Bambusa sp., attacking the young shoot. 



Distribution. — Formosa (Taihoku). 



The nymphs, especially the younger ones, have the habit, when 

 disturbed, of elevating the posterior pair of legs as if to ward off the 

 offending object. 



This habit may be seen very commonly in Jfacrosiphum, Pteroch- 

 loru^, etc., but in the Hormaphidina it is quite rare. 



The winged forms have never been collected. 



Oregma panicola n. sp. 

 Described from specimens jircsurved in alcohol. 

 Wingless viviparous female. 

 Brownish Mack. Bod}^ slightly cdnvcx, almost without hairs. 

 Head and prothorax fused together. Head with a pair of small blunt 

 luirns which are as long as the 2n(l anteiiiial joint, longer than wide. 

 Antennae very short. 4-it>iuted; the 1st joint a little larger than 

 the 2nd; the ;>rd joint almost as long as the basal 2 joints taken 

 together: the 4th joint as long as the ."ird- 



Rostrum very stout, not reaching the nnddle legs. Cornicles 

 much wider than long. Cauda much wider than long, constricted at 

 the base. Anal plate bilobed. 



Length of Itodv — rl.o mm. 



