ALEURODICUS COCOIS. 47 
On each side of the abdominal region are four compound wen 
pores, and there is a pair present on the cephalic end of case (PI. 
XI, fig. 5). There are no reduced compound pores on caudal end 
of case as in many species. 
Vasiform orifice broadly cordate. Operculum subrectangular and 
about twice as broad as long, the ends rounded. Lingula long, ex- 
serted, tapering regularly from base to narrow tip. Two pairs of 
spines arise near distal end of lingula (PI. XI, fig. 3). 
Adult. — Unknown. 
Type. — No. 14765, U. S. National Museum. Described from a few 
pupae on leaf, and three parasitized specimens in balsam mount. 
Aleurodicus cocois (Curtis). 
(PI. XII, figs. 1-15; PI. XIV, fig. 1; text figs. 6-9.) 
Aleurodes cocois Curtis, Gardeners' Chronicle, 1846, p. 284. 
Aleurodicus iridescens Cockerell, Psyche, vol. 8, p. 226 (1898). 
This species was described by Curtis from specimens on coconut 
and was transferred to Aleurodicus by Morgan (1. c). Later it was 
fully described by Kiley and Howard in Insect Life, Volume V, page 
314, and later Cockerell described what appears to be the same insect 
as Aleurodicus iridescens in Psyche, June, 1898. These three descrip- 
tions and the figures accompanying them are herewith reproduced. 
ORIGINAL DESCRIPTION. 
[Fig. 6 (1, 2, 3, 4, 5).] 
Aleyrodes cocois (the Cocoa-nut Aleyrodes). There is a little white mealy fly 
which sometimes infests the cabbages, and an allied species has been sent from 
the West Indies, which differs from it in its structure and economy. We are 
indebted to Sir Robert Schomburgk for specimens of this curious and destructive 
insect, the publication of whose history will be acceptable to the cultivator of 
exotics, and it is to be hoped that it may lead to the discovery of some mode of 
extirpating it. Sir Robert says, " On my arrival in Barbadoes, I was forcibly 
struck with the withered appearance of the Cocoa-nut trees, and I have since 
been told that a disease is prevailing amongst them which threatens to destroy 
all the Cocoa-nut trees in the island. This remarkable disease showed itself in 
the island after the fatal hurricane in 1831, and there are only a few trees 
which are not afflicted by it. It is no doubt to be ascribed to an insect allied 
to Aleyrodes. A great many of the plantations of Cocoa-nut trees which for- 
merly yielded an income of 200 £ or 300 £ per annum have not a single tree 
which bears fruit. The lower leaves die first and fall off, the flowers follow, 
or if nuts should have been formed they dwindle away and do not arrive at 
maturity ; ultimately the budding leaves are attacked, and the crown drops off, 
leaving the withered trunk. ' 
" It is considered that this disease has been introduced since the hurricane, 
from some of the neighbouring islands, when it became necessary to replace a 
number of Cocoa-nut trees which had been destroyed; but some pretend that it 
has been occasioned by the introduction of guano. Smoking, &c, has been of 
