AliliidiJae of Formosa. — 3. 15 



Certain Formosan Aphididae, with 

 descriptions of the nymphs of some of the species. 



Macrosiphum smilacicola n. sp. 



(PL X, A, figs. 4-5) 

 Wiugloss viviparous female 



Pale yellow. Coruieles black, with the tips paler. Cauda yellowish. Body 

 somewhat elongate oval. Head provided with about 8 moderate or rather long setae 

 on the dorsal surface. Eyes rather small. Frontal tubercles large, sliglitly convex 

 on the inner side wdiich is furnishi'd with 2 or .'5 setae. Antennae very long and 

 slender, jtrovided with some moderately long setae that are not capitate; the 1st 

 joint ranch larger than the 2nd; the Hrd not imbricated, provided with from 1-3 

 small circular sensoria arranged in a single row near the base; the 4tli somewhat 

 imbricated ou the basal half, lacking sensoria; the 5tli and 6th imbricated; the 

 relative length of joints about as follows: III-245, IV-194, V-158, VI-270 (50+ 

 220). Rostrum reaching beyond the middle coxae. 



Abdomen furnished with some short or moderately long setae. Cornicles 

 large, cylindrical, stout, gradually expanded toward the base, dilated at the base, 

 distinctly reticulated on the distal one-third, not imbricated on the basal half, about 

 2.7 times as long as the cauda, almost as long as the distal part of the last autennal. 

 joint. Cauda very stout, broadest at the base, tapering, about twice as long as wide, 

 almost as stout as or more slender than the basal part of the cornicle, furnished with 

 about 8 pairs of long lateral bristles. Legs very long and slender, provided with many 

 moderate or rather long setae;femora furnished witli numerous very miuute circu- 

 lar sensoria scattered almost over tlie whole length and one or Uvo larger sensoria 

 near the base; til^ac stouter than the 3rd autennal joint, provided with many very 

 small transversely narrowed sensoria scattered over the whole length except on the 

 distal half of the hind tibia; tarsi imbricated, hind tarsi slightly shorter than tlie 

 basal part of the last autennal joint. 



Length of body-about 3.0 mm. Atitenna-about 4.4 mm. Cornicle -about 1.0 mm. 



Winged viviparous female. 

 Pale yellow, with a large black patch at th(^ middles of the dorsum in front of 

 the cornicles and a pair of smaller black patches behind the cornicles. Head and 



