74 K- Takahashi 



follows: ni-90,rS^ 40. Plead -witliont frontal tubercles. Eyes M-ithout ocular 

 tubercles. Rostrum reacliing far beyond the hind coxae. Cornicles provided with 

 .1 few long bristles near the base of the cone. 



(The second instar) Antennae 5-jointed; the relative length of joints about 

 as follows: III-80, IV-'^2, V-40. Cornicles on hairy cones. 



(The third instar) Antennae G-jointed; the 5th joint with a sensorinni near 

 the usual apical one; the relative length of joints about as follows: III-70, IV-37, 

 V-39, VI-37. Ocular tubercles visible. Wing-pads very short. 



(The fourtli instar) Antennae 6-jointed; the 5th joint with a sousorium near 

 the usual one; the relative length of joints in tlie wingless form about as follows: 

 III-98, IV-43, V-40, VI-37. AVing-pads well developed. 

 'Host.-Finns sp., attacking the slioot. 

 Distribution.- Formosa : Taihoku, Shinten. 



A few viviparous females, both winged and wingless, and nymplis wore colle- 

 cted by the author on Octolier 13, 1923, at Taihoku. 



Unilachnus orientalis n. sp. 

 Wingless viviparous female. 

 Yellowish brown. Head slightly dusliy. Eyes black. Antennae pale gray, 

 with the apex of the 5tii joint and the 6th black. Cornicles and cauda yellowish 

 brown. Femora dusky brown, paler at tlie base; tibiae pale greenisli gray, with 

 black apices; tarsi black. Body not elongate, provided with many very long hairs,, 

 rather densely covered with a powder. Head divided, with many very long hairs. 

 Eyes with the ocular tuber.les quite small or almost lacking. Antennae provided 

 with many very long hairs; the 3rd and 4tli joints without sensoria; the 5th with a 

 medium-sized sensorinni at the apex; the relative length of joints about as follows: 

 III-65, IV-32, V-30, VI- 31. Hostrum as in Unilachnus parvus Wihon in ntriw- 

 ture, reaching beyond the middle coxae. 



Cornicles on the cones which are rather small and provided with about 

 17 long hairs. Cauda very short, rounded. Legs very long and stout, covered 

 with powder, furnished with many very long hairs; tibiae stouter than the antenna; 

 tarsi not imbricated; hind tarsi a little shorter than the 3rd antennal joint, the 2nd 

 tarsal joint about twice as long as the 1st. 



Length of body-about 2.1 mm. Antenna-about 1.0 mm. 



Winged viviparous female. 

 Yellowish brown. Head somewhat dusky. Eyes black. Antennae pale 



