p. VAN DER GOOT, NOTES UR ORIENTAL APHIDIDAE. 1 23 

 Alate viviparous female. 

 Measurements. 



Colour. 



Body dull blackish throughout. Ej'es, antennae, etc. black. 

 Pterostigma of forevvings black. 



morphological characters. 



Body of the usual shape, nearly bare. Frontal teeth or 

 hornlets very minute. 



Antennae about half as long as the body; relative lengths 

 of the last joints about as: 62, 30, 30. Sensoriae are distri- 

 buted as follows: III 23, IV 10 + 1, V 7 -f 1. 



Rostrum, siphunculi, etc. as in the apterous form. 



Wings with the usual Oregma-v&mWon. Media I of fore- 

 wings once forked, the fork being long and slender, the stalk 

 ending near the base of the media II. Cubitus and media II 

 with a very distinct common basal stalk. Hooking-hairs 

 2 in number. 



Biology. 



This species was observed in the Botanical Gardens of 

 Singapore on an undeterminated plant {Amomum sp. ? ?), 

 thickly populating the stalks and bases of the leaves. At 

 the time of collecting (March 29"' 191 7) ^ few alate females 

 were observed amongst the large numbers of apterous aphids. 

 The colonies were found visited by small black ants. 



This same species has been collected in Java in mountainous 

 regions (+ 1400 M.); only the apterous form was known. 



