Apbididae of Formosa. — 4. 43 



Body large, covered with many very long rather fine bristles. Head much 

 wiiler than lung', divided, provided with many long bristles which are almost as 

 long as the 2nd antennal joint. Eyes protuberant, with small ocular tubercles. 

 Antennae covered with many very long bristles which arc almost as long as 

 those on the head : the 2nd joint very slightly shorter than the 1st : the 3rd 

 provided with about IS circular, somewhat protuberant sensoria, most of which 

 are of medium size or rather small, arranged not in a single row along the 

 whole length except on the basal portion : the 4th with about 5 similar sensoria 

 arranged in a single row: the 5th with only a large circular sensorium at the 

 tip; the relative length of joints about as follows: III-145, 1Y-60, V-65, VI-42. 

 Rostrum reaching the middle coxae. Wings soft: subcosta on the front wine- 

 stout, witli about 7 minute sensoria near the base; the 1st and 2nd obliques 

 stout, very closely arising, scarcely curved: the 3rd oblique not faint, but thinner 

 than tin 1st and 2nd. a little obsolete at the base, twice forked on the left, 

 thrice forked mi the right, the upper branch near])- extending to the apex of 

 the wing; stigma long, elongated mi the distal portion: stigmatic vein almost 

 as stout as the 3rd oblique, scarcely curved, extending to the tip of the -wing- 

 hind wings witli 2 divergent obliques; booklets 5. Bristles on the dorsum of 

 abdomen a little lunger than those on the head. In a specimen treated with 

 caustic potash, a few small black spots are visible on the abdomen. Cornicles 

 rather small, situated on high hairy cones. Cauda almost semicircular. Anal 

 plate rounded. Legs very long, covered with many stouter bristles, some of which 

 are longer and almost as long as those on the abdomen; tibiae much stouter 

 than the antenna; hind tibiae somewhat tapering; hind tarsi a little longer 

 than the 5th antennal joint, the 2nd tarsal joint almost twice as long as the 1st. 



Length of body — about 7.5 mm. Antenna — about 2.2 mm. 



Fore wing — about 7.7 mm. Hind tibia — about 6.2 mm. 



Host. — Liquidambar formosana. 



Distribution — Formosa: Nanto in Taichu-prefeeturc 



A single specimen was collected by Mr. J. Sonan on the plant above 

 mentioned in February 1925. This aphis is peculiar in some characters of the 

 wings and is not a typical Dilachnus. 



Stomaphis liquidambarus n. sp. 

 Wingless viviparous female 



