1046 The American Naturalist. [December, 
consist of two parts, a broad ring-like basal part, and a cylin- 
drical sharply truncate terminal part. In C. confusus these 
processes are decidedly more slender than in C. tomentosus, the 
latter being characterized by their great thickness. In C. 
cacti from Jamaica they are also thick, practically as in tomen- 
tosis. 
Grouped Orifices—Little groups of glands, like those of the 
Diaspine, are seen among the spines. These groups are com- 
pact and very clearly circumscribed, and are quite obvious in 
C. cacti (Jamaica) and C. confusus. In the latter, some groups 
are of three orifices only, but usually there are many, perhaps 
averaging about 15. 
Viviparous Habit—C. confusus was found to have the body 
full of well-formed larvee. C. tomentosus, from Silao, which had 
been long in alcohol, were full of larve. 
Immature Stages. 
Color—The young of C. tomentosus are reddish-purple. 
Antenne.—I found 7 joints in the second stage of Jamaican 
C. cacti. In C. confusus there seem to be 7 joints in the larva, 
but two are, perhaps, to be considered false joints; these are in 
joints 1 and 3. The second, first and fifth (or last) are about 
equal,the third and fourth shortest. 'The last four joints 
emit hairs, one on the fifth being especially long. The 
antenn: of C. confusus appear to degenerate with the growth 
of the insect. 
In the larva of C. tomentosus, I found the antenne 5-jointed, 
the proportions of the joints as in Confusus. The false joint in 
joint 1 is noticed, but it is evidently not a true joint. Joints3 
and 4 have a peculiar shape, concave on one side, convex on 
the other. The last joint has four hairs, two of which are 
long. 
The larva of Coccus is commonly said to have 6-jointed 
antenne. According to Signoret's figures, that of the 9 has 
6 joints, that of 3 only 5. 
- Legs —The legs are, of course, much better developed i in the 
larva than the adult, in proportion to the size of the insect. 
In the leg of a larva of C. confusus, I noticed two strong bris- 
