AphidiJae of Formosa.- — 3. 75 



yellowish brown, apex of tlie 5th joint aud the 6tli black. Mesothorax dusky. 

 Stigma aud veins pale brownish gray. Cornicles and caiida yellowish brown. 

 Femora brownish, paler at the base; tibiae pale greenish gray, ^^'ith black apices; tarsi 

 black. Body not elongate, provided with many very long hairs. Head divided. 

 Eyes protuberant, with tlie ocular tul^ercles quite small or almost lacking. Anten- 

 nae furnished with many very long hairs which are almost as long as tliose on the 

 head; the 1st joint slightly shorter than these hairs; the 3rd furnished with about 6 

 medium-sixed or rather small circular sensoria arranged in a single row along the 

 whole length except on the basal portion; tlie 4th without sensoria; the 5tli with a 

 primary scnsorium of medium size at the apex; the relative length of joints about as 

 follows: III-65, IV-32, V-30, VI-30. Rostrum as in Unilachnus j^arvufi, reaching 

 the middle coxae. Wings imbricated; stigma almost as in U. parvus; the 3rd 

 oblique faint, obsolete on the basal part, not branched; stigmatic vein very sligiitly 

 curved; booklets 4. Cornicles situated on the cones which are not large, provided 

 with about 17 hairs. 



Length of body-about 2.2 mm. Antenua-about 1.0 mm. 

 Fore wing-about 2.75 mm. 



Yioat.-Pinus up., attacking tlio leaf. 

 Distribution-Formosa: Taihoku. 



Tins species differs from UnUaclmus parvics Wilson (Trann. American Ent. 

 Soc, XLT, p. 104) in the not elongate body, as well as iu lacking sensoria on the 4th 

 antennal joint of the winged form. 



This aphis resembles Schizolaclinus tomentosuH De Gcer iu some characters, 

 diSering from it, however, in having the 3rd oblique of the front wing unbranched. 

 A few wingless viviparous females and a winged one were collected by the 

 author on November 3, 1923, at Taihoku. 



Eulachnus piniformosanus Takah. 

 Aphididae of Formosa, part 1, p. 83 (1921) and ibid, part 2, p. 138 (1923). 



Nymph. 

 Key to instars. , 

 ( 1 ) Antennae 4-jointed The 1st instar. 



Antennae 5-jointed The 2nd instar. 



Antennae 6-jointed (2) 



( 2 ) The 4th antennal joint without sensoria The 3rd instar. 



The 4th antennal joint with a seusurium The 4th instar. 



