70 B- Takahaahi 



slender than, but almost as long as, the front tibia, with a bristle near the apex, the 

 sensorium very small, eircular; the 4th longer than the basal two joints taken toge- 

 ther, provided with minute spinules, and a few bristles at the apex; the rela- 

 tive length of joints about as follows: III-25 30, IV-20. Rostrum very long, 



reaching beyond the hind coxae. Head and pronotum fused together. Body 

 without tulKTcles. Abdomen provided with a few moderate to rather long bristles. 



Cornicles not distinct, represented almost by a pore. Cauda almost semici- 

 rcular when seen from above, very short, much wider thaia long, broadly rou- 

 nded, with a pair of bristles. Legs provided with a few very long bristles on tlic 

 distal part of the tibia, and tarsi; tarsi with minute spinules; hind tarsi almost as 

 long as, or slighty shorter than, the 4th antennal joint. Anal plate not sinuated. 

 Length of body-about 0.7mm. Antenna-about 0.3 mm. 



When newly produced, the rostrum reaches far beyond the cauda. 

 (The second instar) Differs from the first instar in the following chara tei's: 

 Antennae very slightly dusky at the apices of joints. Legs slightly dusky. 

 Antennae 5-jointed; the 3rd joint with 2 or 3 bristles; the 4th with a bristle; the 

 relative length of joints about as follows: III-30, IV-17, V-25. In some speci- 

 mens which are probably the nymphs of the winged form, the 3rd antennal joint is 

 comparatively longer and the relative length of the antennal joints is as follows: 

 III-45, IV-19, V-26. Cornicles slightly protruding. Cauda provided with 2 pairs 

 of bristles? 



Length of body-about 1 .0 mm. Antenna-about 0.6 mm, 



(Tlie third instar) Differs from the second instar in the following cliaracters: 

 Wingless form: antennae 6 -jointed, the relative length of joints about as 

 follows: III-27, IV-14, V-20, VI-27. 



Length of body-about 1.4 mm. Antenna-about 0.6 mm. 



Winged form : wing-pads beginning to appear, yellow, antennae with tlie 3rd 

 joint longer, the relative length of joints about as follows: III-40, IV-16, V-24, 

 VI-28. 



Length of 1x)dy-about 1.3 mm. Antenna about 0.55 mm. 



(The fourth instar) Differs from the tliird instar in the following characters: 

 Wingless form: tlie rtdative lengtli of antennal joints about as follows: 

 III-37, IV-17, V-23, VI-25. In some individuals the rostrum is uuicli shorter, 

 reaching only to tiie middle coxae. 



Length of body-about 1.4 mm. Antenna-about 0.7 mm. 



