p. VAN DER GOOT, NOTES OR ORIENTAL APHIDJDAE. 121 



VVaxglands allways distinctly present, of the common 

 Jnsularis''-iy^Q, viz grouped along the margins of head, 

 thorax and the abd, segments i ± 8 in groups, composed 

 of one single longitudinal row of glands. Waxglands small, 



Fig. 4. Orcgnia singaporcnsis n. sp., 



caudal part of apterous female (dorsal view). 



gl. = glands ; c. = cauda. 



short-ovate or rounded quadrate, lying close together ; the 

 glands on head and thorax are very small, roundish and 

 sometimes lying slightly isolated. Groups of glands on the 

 8'^ abd. segment occupying the sidepart of the hindmargin, 

 allways at a considerable distance from each other. 



Arrangement and number of glands usually are as follows : 

 /lead 4, protJiorax 4, viesotJiorax 3, metatiiorax 4, abd. I 4, 

 abd. II 5, abd. Ill 4, abd. IV 4, abd. V 4, abd. VI 4, 

 abd. VII 3—4, abd. VIII 4—5. 



Biology. 



This pale-coloured Or€gma-s^ç.c\ç.s was collected in the 

 Botanical Gardens of Singapore towards the end of March 

 1917. It was living in moderately large numbers on the 

 underside of the leaves of some bamboo-plants, the aphids 

 sitting scattered over the whole surface. Small black ants 

 {Cremastogaster sp.) were observed to visit the colonies of 

 this plantlouse. At the time of collecting only apterous 

 females could be found. 



Locality. 



Singapore. 



