Vol. Vlll] ESSIG & KUWANA-SOME JAPANESE APHIDID^ 71 



ment 0.375 mm.) ; total 1.21 mm. Sensoria of various sizes 

 and distributed over III and IV in large numbers as follows.: 

 (left) III, 23; IV, 8; V, the usual normal one which is very 

 large. The paratypes show the following variations: III, 

 21-28; IV, 9-12; V, 1-3. Rostrum reaching to the 2nd coxse. 

 Thorax shiny black. Coxje, tarsi and apical ends of the femora 

 and tibiae black, the remainder of the legs pale brownish. 

 Wing veins dusky; length of the front wings 2.1 mm. Abdo- 

 men yellowish or dark green with dark markings on the sides 

 and dorsum. Cornicles dusky, faintly imbricated, somewhat 

 constricted beyond the middle, slightly recurved and 0.26 mm. 

 long. Cauda dark and 0.06 mm. long. 



Apterous viviparous females (Paratypes) — A large num- 

 ber of specimens. Length 1.27 mm., width 0.7 mm. Prevail- 

 ing color dark green. Head dark green. Antennae dark except 

 III and the base of IV which are pale ; lengths of the articles : 

 I, 0.07 mm. ; II, 0.05 mm. ; III, 0.17 mm. ; IV, 0.14 mm. ; V, 

 0.095 mm. ; VI, 0.30 mm. (base 0.07 mm., filament 0.23 mm.) ; 

 total 0.825 mm. Thorax and abdomen dark-green. The lat- 

 ter with a pair of tubercles just behind the cornicles. Cornicles 

 black, imbricated, almost straight, 0.33 mm. long. Cauda 

 black, wide at base and 0.09 mm. long. 



Nymphs — pale green. 



Host plant — apple. 



Date of collection — May 7, 1913. 



Collection number — 4. 



Aphis medicaginis Koch 

 Figure 17 

 Recorded from a number of host plants as follows : 



1. On Soramame, Vicia faba equina Pers., Nishigahara, 

 Tokyo, May 8, 1913. Collection number 6. 



2. On Utsugi, Dcntma scabra Thunb., Somei, Tokyo, May 

 10, 1913. Collection number 14. 



3. On unknown plant, Somei, Tokyo, May 10, 1913. Collec- 

 tion number 15. 



