1 



Apbididae of Formosa. — 4. 37 



imbricated; subcosta on the front wing provided with form 10-12 minute 

 sensoria in a group near the base and 2 or 3 small ones; stigma normal, 

 furnished with about 20 long setae not arranged in a row: the 1st oblique 



straight: the "2nd somewhat curved; the 3rd faint, obsolete at the base, one.' 

 forked; stigmatic vein very slightly curved, extending to the tip of the win 

 hind wings with 2 divergent obliques; hooklets 4. Abdomen on the dorsun 

 furnished with some small groups of dusky wax-pores and numerous very small 

 dusky spots, from each of which spots a bristle arises. These pores and spots 

 arc visible in specimens treated with caustic potash. Cornicles <>n moderately 

 large cones which are furnished with numerous longer bristles. Cauda semicircular 

 in outline when seen from above, provided with numerous very long bristles. 

 Anal plate normal. Legs very Ion",', covered with numerous very long stout 

 bristles : hind tibiae almost as long as the 5th antenna! joint, the 2nd tarsal 

 joint almost 3 times as lone,- as the 1st. 



Length of body— about -">.2 mm. Antenna — about 2.0 mm. 



Fore wiiii;' — about 5.0 mm. Hind tibia — about 2.5 mm. 



Host. — unknown. Perhaps a plant of the Coniferae. 



Distribution. — Formosa : Niitakayama. 



Two winged tonus wen- collected by .Mr. J. Sman at Kanko (altitude 

 about 8300 feet) on the Mount Niitaka on September 17. 1924. This species 

 is very peculiar in possessing numerous small sensoria mi the antennae, in this 

 respect resembling the males of some Lachnina - 



Dilachnus orientalis n. sp. 

 Wingless viviparous female 



Blackish brown, shining, not covered with white wax. In specimens treated 

 with caustic potash, antennae dusky at the apices of the 3rd, 4th and 5th joints 

 and on the Gfch, ahdonien on the dorsum with some dark brown patches on the 

 hind portion and some small similar ^pots. front and middle tibiae black on 

 the both ends ami the middle portion, hind femora black o"n the distal half, 

 hind tibiae black, with the portion near the base pale brownish, cornicles, cauda 

 and anal plate dark brown. 



Body oval, covered with many long bristles. Head divided, with many 

 rather stout hairs, of which those on the front are somewhat longer and almost as 

 long as the 1st antennal joint. Antennae rather slender, almost as long as the 



