200 Memoirs of the Indian Museum. | [Vor. VI, 
Cornicles cylindrical, imbricated for the most part. 
Cauda small, constricted a little about the middle, ensiform. 
Anal and genital plates distinct, the latter elliptic. 
Legs normal, black, excepting bases of femora and tibiae. 
Rostrum short, extending half way between first and second coxae. | 
Size of individuals variable ; autumn migrants are larger than the alate females 
of the summer. 
Measurements on an average :— — 
Body Me J. 16010 1:75 ROSES to 0 75 m: 
MIEN ss. & NTI SONT 
Wing expanse .. 5°'85—6°20 mm. 
Cornicle .. Jes OMA) sansa 
Cauda +3 COLOR 
Alate male.—The alate male is essentially quite similar to the alate female des- 
cribed above; the colour alone is darker; the size smaller or larger; the pattern ex- 
actly the same. 
Antennae longer with a very large number of sensoria. 
Antennal proportions -— 
SOU: 18 We Vale 
@ 22 167) 16 6+32 : 
Lengths.. 036 0°28 0°26 0‘10+053 mm. 
Sensoria scattered all round the articles, 32-40 on III, about 20 on IV and about 
15 on V. 
Cauda raised upwards owing to the presence of the large genital armature; it is 
slightly smaller than that of the alate female. | 
Anal plate narrow ; genitalia of usual form. 
| 
| 
3 
Measurements :— 
vBodya a= Br ae LOTS OMC 
Antennae pe m Ne 2:05 11m: 
Wing expanse .. FA CU SRE 
Cornicle of = ae Os 
Cauda iG I 19 0700 ay eae ; 
Oviparous female. —Specimens reared on plums are dirty reddish-brown in colour ; 
body oval, with short legs; they move with an awkward gait. The antennae, cor- 
nicles and cauda are all smaller than those of the apterous viviparous female. 
The frontal tubercles on the head are hardly present. 
Antennal joints indistinct ; spur much longer than article III. 
Proportions :— 
LIT IE V. Wali: 
13 9 85 5+20 
Lengths.) sown 0'15 O'I4 0‘08+0:34 mm. 
