Aphididae of Formosa. — 3. lOl 



Certain Japanese Aphididae. 



Macrosiphum esakii u. pp. 



(ri.IX,B,Hgs. 5-7) 

 Wingless viviparous fumale. 

 Differs from 31. paaleriac Takah, (Aphididae of Formosa-1, p. 11) iu the 

 following characters: 



(1 ) Shining black. 



(2) Antennae provided with some moderately long slightly knobbed setae. 

 (In 31. pacdcriac, antennae witli some very sliort similar setae). 



(3) Cornicles cylindriciil, more slender, expanded at the base, but not aKjut 

 the middle, imbricated. 



(4) Body smaller, measuring about 2 mm. in length. 



The cornicles are scarcely reticulated at the tip as iu 31. jxurhriac Takah. 

 Host. -Pacdcri a tomcntoxa. 



A few wingless forms were collected by Mr. T. Estiki and the autiior at 

 .Ilakoiaki, near Fukuoka, Japan, on .June 2, 1923. 



Macrosiphiun smilaceti n. sp. 

 ^yingless viviparous female. 

 Shining red, with l)lack dorsal markings. Cornicles black. Cauda not black. 

 Apices of femora and tibiae, and tarsi black. Body in form as iu 3L romi' L. 

 Head on the dorsal surface provided with about 10 rather long normal setae. Fron- 

 tal tubercles large, very slightly convex on the inner side which is furnished with 

 2 setae. Antennae long and slender, with some moderately long stout setae which 

 are not capitate; the 3rd joint with 5 or 6 rather small circular sensoria iu a row 

 ^' near the base; the 4th slightly imbricated, without sensoria; the relative length of 

 joints about as follows: IIM65, IV-HO, V-95, VI-208 (30 + 178). KoL^rum 

 reaching beyond the middle coxae. Abdomen with some moderate or rather long 

 normal setae on the dorsum. Cornicles cylindrical, very stout, moderately expan- 

 ded toward the base, not dilated at the base, somewhat curved, imbricated, not 

 reticulated, about 4 or 5 times as long as wide, longer than the 4th antennal joint, 

 about 1.5 times as long as the cauda. Cauda large, stout with about 3 pairs of long 

 lateral bristles. Legs long; tibiae siouter than the antenna, provided witli many 

 moderate or rather long stout setae which are not capitate; hind tarsi slightly longer 

 than the basal part of the last antennal joint. 



