152 Memoirs of the Indian Museum. (Vous vas 
From typical Pemphigus this aphid differs in several important respects. 
(1) The antennae of the alate females have article VI longer than III; the 
reverse is true for Pemphigus (Oestlund, Aphid. of Minn., 1887). 
(2) The sensoria are more rounded than transverse.” 
(3) In the wings the first and second discoidals are formed by the Se of a 
common trunk. 
(4) The rudimentary gonapophyses areonlytwoinnumber. The usual number 
in Pemphiginae is three (after Tullgren and van der Goot). 
(5) The apterous females have the antennae made up of five joints only.’ 
Such important and distinctive features perhaps require a generic separation 
from Pemphigus as defined at the present day. But as I have not had an oppor- 
tunity of a detailed examination of this genus, I have refrained from proposing a new 
name, and left the insect under Pemphigus. The change may later on be introduced 
by better authorities on the subject, if considered necessary. 
[The different characters of “‘ Pemphigus’’ aedificator show that it is distinctly different not only 
from the genus Pemphigus but as well from the tribe Pemphigina, to which it has hitherto been con- 
sidered to belong. With most characters in common with the Pemphiginae, this species principally 
differs in the number of rudimentary gonapophysae and the form of the mesothorax, both very impor- 
tant characters. As to my personal opinion, P. aedificator might perhaps be considered the “ missing- 
link” between the tribe Pemphigina and some representatives of the tribe Hormaphidina, as for instance 
the species of the genus Schizoneuraphis, v. d. G. 
The characters of P. aedificator necessitate not only the erecting of a new genus but even of a new 
tribe. In remembrance of the late Mr. Das, my esteemed co-worker, I have the honour to propose the 
name Dasia for the new genus, Dasiina for the new tribe, with characters as follows :— 
Tribe DASIINA, nov. 
Only genus: Dasia, nov. gen. 
Characters: those of the genus Dasia. 
Genus Dasia, van der Goot, gen. nov. 
(Type: Pemphigus aedificator, Buckt.). 
Morphological characters :— 
Body with distinct groups of wax-glands in the apterous as well as in the alate form. Facets of 
wax-glands circular or polygonal, lying close together; no central-facet present. 
Mesothorax simple, without distinct bosses. 
Eyes of the apterous female consisting of 3 stemmata only. z 
Antennae six-jointed, in the apterous form often 4- or 5-jointed. Processus terminalis distinet, but 
always shorter than half the length of the basal part of the ultimate joint. Primary sensoriae rounded, 
small, with distinct hair-rims. Secondary sensoriae oblong-ovate, broad, not longer than half the cir- 
cumference of the antennal joint; hair-rim always absent. 
Cornicles entirely wanting. Cauda obsolete. Anal-plate simple. Rudimentary gonapophysae 2 in 
number, distinctly separate, spiny. 
! [The relative lengths of the antennal joints have no generic value. P. v. d. G.]. 
* [The sensoriae of P. aedificator does not differ much from those of other true Pemphigus species, 
such as P. bursarius, L., P. spirothaecae, Pass., etc. P. v. d. G.]. 
3 [In the genus Pemphigus only the fundatrices have 4-jointed antennae, exactly as is the case too 
with P. aedificator, according to Mr. Das. The virgogeniae of Pemphigus always have their antennae 
5-jointed! P. v. d. G.]. 
