354 R. Newstead: 
the insects were finally mounted in Canada balsam the subeutaneous tubes were rendered practically invisible. 
In well-stained preparations, however, these organs show up very clearly and may be described as follows: 
Orifice eircular surrounded by 3—5 (usually 4) slender hairs; cutaneous ring broader than the proximal ? 
end of the subcutaneous tube; the latter usually slightly longer than the outstanding hairs, distal extremity 
slightly dilated (See figs. 2, 2a, 2b). The tubes vary in length, the shortest being placed on the last three 
abdominal segments, the longest at the sides (margin) and in front between the antennae. With the 
exception of those placed at the extreme margin all the rest are on the derm of the venter, and they are 
arranged in the following order: in pairs all round the margin; 7—11 between the antennae; 2—-3 imme- | 
diately behind the antennae; many isolated ones scattered over the whole of the venter, and a group of | 
7 (usually) immediately anterior to the anal lobes. There is also a posterior pair of „cicatrices“ which 
have been hitherto overlooked. 
The great variation in the antennal formula of D. virgatus has already been pointed out by 
Tinsley! and although I do not find any very marked variation in the antennal formula of the examples 
described by me under the name D. ceriferus, there is a marked difference in this respect between the last 
named and the var. which I have here described from Madagascar. 
Fernald? gives the following geographical distribution: „Jamaica, Sandwich Islands, Mauritius, 
Mexico, and Texas“ to which Ceylon should be added; and the food plants quoted are: „Cactus, Coconut- } 
palm, cotton, violets,“ etc. 
Habitat: On an unknown plant; Tamatave (E. Madagascar), October 1904. 
’ 
Icerya seychellarum Westw. 
Several examples of this interesting species agreeing in every detail with the diagnosis given by 
Westwood?° in 1855. The types came from Seychelles Islands; but it has since been recorded from 
Mauritius, Madeira, China, New Zealand and Formosa; but it is new to Madagascar. 
Habitat: On „Pampelmus“ (Citrus decumanus L.); Voangi Soe, and also on the same plant and 
on the „Jacktree“ (Artocarpus integrifolia Font.) at Fenerive (E. Madagascar) 1904. 
Both lots were attended by a small species of ant. (Pheidole punctata Mayr var. 
picata). 
Icerya seychellarum var. cristata n. var. Newst. 
Differs from typical examples in having a strong median crest formed of a series of stout white 
waxen plates with yellow tips, and long glassy filaments. The lateral plates are also somewhat larger 
and more widely separated at their apices than in typical examples. The marsupium though comparatively 
small, is well formed so that the specimen may eventually prove to be a very old adult female. Cockerell’s* 
Icerya albolutea from W. Africa is similar but in this the dorsum is „entirely covered with bright yellow 
cotton, though it seemed not to have the glassy or silky filaments“. 
Habitat: Fenerive (E. Coast Madagascar), July 1904. Food plant not given. Type. Coll. Zool. 
Museum. Berlin. 

ı Canadian Entomologist. p. 222. 1398. 
2 Fernald’s Catalogue. p. 27. (1903.) 
® Gard. Chron. p. 836. (1855.) 
* The Entom. XXXI. p. 259. (1898.) 

