122 P. VAN DER GOOT, NOTES OR ORIENTAL APHIDIDAE. 

 Note. 



From the many Oreg)na-s^e.c\ç.s, known to feed on the 

 leaves of bamboo-plants the species described above can be 

 very easily distinguished. The pointed horns it has in common 

 only with 0. basalts, O. salatigensis and 0. pallida. The 

 two last-named species have distinct dark greenish markings; 

 the first, allthough often pale-coloured too, nevertheless is 

 distinguishable by the violet or reddish area around the 

 siphunculi, the absence of waxglands on head and thorax 

 and it's living on the basal portion of the leaf only. 



OREGMA SUNDANICA v. d. G. 



Apterous viviparous female. 



General colour. 



Body greyish black or brownish black. Dorsum and mar- 

 gins thickly pulverulescent, especially in the caudal region. 

 Larvae of a dark brownish colour. 



Principal morphological characters. 



Arrangement of waxglands slightl)- different from the 

 original description of Javanese specimens. ^) Generally there 

 are present : one large dorsal gland on abd. 8, 2 spinal 

 glands on abd. 6, sometimes 2 spinal glands on abd. 5 ; 

 further small marginal groups on the abd. segments 4 + 7. 

 The marginal groups are roundish, small, composed of i to 4 

 semi-circular glands tightly closed together, their inner borders 

 sometimes indistinct. The spinal groups contain one single, 

 oval, large gland. Sometimes pro-, meso- or metathorax bear 

 2 small spinal groups, shaped like the marginal groups. 



The arrangement of the glands shows distinctl}', that in 

 the genus Oregnia the 0. sundanica belongs to the so-called 

 „lanigera-^xow^'\ 



') See P. v. D. GOOT: „Zur Kenntnis der Blattläuse Java^s". (Contr. 

 à la faune des Indes néerlandaises, vol. I fase. Ill, 191 7, pag. 230). 



