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146 Memoirs of the Indian Museum. [Vor. VI, 
The insects are clothed with white powder, large quantities of which collect at one 
end of the gall. It is secreted by rounded dot-like glands, situated along the dorsum 
i in rows, two of which are medial and two on either 
side lateral. There are only four glands on the head 
and a conspicuous one in the centre of the anal 
plate. None are to be found ventrally. 
‘Head small, concolorous with body, or slightly 
darker, without frontal tubercles. Eyes very small 
and black. Antennae short and stout, about one 
quarter the length of the body, composed of five 
Fic. 2.—Pemphigus aedificator (Buck.). joints only.' Article I is gibbous, subequal to II 
Wax-plate with facets of apterous but much thicker. Spur blunt, thickened at apex 
female, x 890. : : ; : : : 
which ends in a few short stiff hairs; if the sensorium 
be counted with it, the spur is almost half as long as the base.” 
Length proportions :— 
ET: Irene V. 
30 28 43 40 60+27 
Lengths 0050 0:049;  0:007, ~ 07065); 0 100 0:048 mm! 
the primary sensoria on articles IV and V have distinct hair-rims. 
Lateral tubercles are conspicuous as black dots on carinae; in macerated glycer- 
ine mounts they come out like big sensoria.’ | 
The glands consist of a larger or smaller number of polygonal or circular plates 
with a few dots on each. The plates have no definite arrangement in their grouping 
and sometimes appear as if depressed below the general surface. They secrete thready 
white flocculence which later turns powderv.* 
The cornicles and cauda are absent. 
! [Stem-mothers have only 4 joints to their antennae; the body is darkish (after note by Mr. Das). 
Pave dr: 
? [In giving measurements of the spur most writers agree in counting the sensorium as belonging 
to the base of the last antennal joint. P. v. d. G.]. 
8 [In specimens of apterous females, which I received from Mr. Das, I could not find any trace of 
‘lateral tubercles,’’ which by the way would be a unique fact if occurring in this genus. Perhaps Mr. 
Das may have mistaken the stigmata for ““tubercles?’’ P. v. d. G.|. 
# [To this description of the wax-glands of P. aedificator a few corrections ought to be added. 
The different technical terms, as given by Mr. Das, are not quite correct. In accordance with 
Börner, who furnished a very complete description of the wax-glands of the Chermesinae, the wax-glands 
of Aphididae are cylindrical hypodermic cells. In slides these glands show like circular or polygonal 
figures with a chitinous outlining, called facets. These facets are mostly grouped together on more or 
less distinct and chitinous plates, called the wax-gland plates. The waxy flocculence is secreted through 
very small pores in the membrane of the facet, the so-called wax-pores. 
In the apterous female of P. aedificator the wax-plates are not chitinized, but still are quite distinct 
from the rest of the integument because of their surface being quite smooth, not striate like the rest. 
he facets are circular or semicircular, lying quite close together, their number varying from 20 to 60 
on each plate. A “blate-hair’’ is always wanting. P. v. d. G.]. 
