APHIDID-E OF FORMOSA. 45 



Y — 16, YI — 27 (15 + 12). llustriim reacliiog the iiiiJdle oosa'. rrouotum 

 pro^'ided A^'ith ;i pair oi very liJDg capifcxte hairs arising from siuall tubercles 

 .it tlie middle of the dorsum and 4 similar hairs iu a transverse row near the 

 hind margin ; nieso-and metauotum with 4 similar capite hairs arranged in a 

 trausveree row. The 1st, 2ud, 3rd and 4th abdominal segments each provided 

 with 4 capitate hairs arising from small tubercles in a ti-ausverse row on the 

 dorsum ; the 5th, 6tli and 7th segments with a pair of similar hairs at itid- 

 leugth of the dorsum ; the Sth witli a pair of long normal bristles, which are 

 not black, on the dorsum. All the capitate hairs oii the head, thorax and 

 abdomen sutequal iu length. Cnrnicles as iu the viviparons form. Cauda 

 slightly coastricted. Anal plate large, rounded, not liil()bed, provided with many 

 long bristles. Legs Anth many bristles ; hind tiliia? rather thick, provided 

 with many rather small circular seusoria ; tarsi ucirmal iu leugth. 



Length of body — about 1.3 mm. Autenua — 0.75 mm. 



Collected iu November 1921 in Taihoku. 



Host. — Lcujvrstrce'iiiia s]j. 



Eutrichosiphum minutum u. sp. 



^^'iugless viviparcius female. 



Shining black. CV'ruicles black. Head yellowish brown. Bod's- pro- 

 vided with man}- very long bristles A\hich are not capitate. Head 

 with many long bristles. Frontal tubercles very short. Anteuufe short, 

 5-jointed; the 3rd joint provided with about 8 very L.mg bristles, ■s\ithout 

 sensoria ; the 4th very slightly imbricated, with 4 long 1 ristles, the apical 

 sensorium circular and rather large ; the Sth provided with 2 bristles ; the 

 relative length of joints as follows: HI— 40, lY— 22, Y— 55 (17 + 38). 

 Ocular tubercles promiueut. Fuistrum reaching beyond the hind cox». Pro- 

 uotum fused with the head. Spiracles not protuberant, Abd^imeu almost 

 circular. 



Cornicles short and stout, as long as the last autenual joint, prominentlv 

 dilated at midlougth, uoiTowest at the tip, 4 times as long as wide, vd\.\\ 

 many long l)ri3tles. Caudal segment not produced into a process. Legs with 

 some lone; liristles. 



