296 . Transactions. — Zoology. 



or callosities as of some exuded substance. The skin, as shown in fig. 10, 

 is covered with minute hairs interspersed irregularly with circular spin- 

 nerets. The spiracles appear to be round, as in Lecanium; the trachese are 

 very large ; there are no spkacular spines. 



The eggs, as stated above, are brick-red in colour, oval in shape ; and I 

 was fortunate enough to hatch out a number of the young insects. These, 

 as shown in fig. 11, have generally the shape of the adult, and are of the 

 same colour. The antennce, fig. 12, have six joints, of which the last is the 

 largest ; on this are several strong hairs. The eyes resemble those of 

 the adult ; as also the legs, generally ; but these latter, fig. 13, are somewhat 

 longer, and there is no fringe on the internal edge of the tibi^ and tarsus. 

 The trochanter shows the same long hair, but instead of the bristles at the 

 claw there are two long fine knobbed digitules. The rostrum and mentum 

 are prominent and well defined ; the latter seems to be bi-articulate ; and 

 the seta? are very long and strong (I can only make out three). The skin 

 is covered with circular spinnerets and minute hairs, and the spinnerets are 

 most numerous at the end of the abdomen, where also are two long hau's. 

 The anal orifice seems to be encircled by a folded ring. Length of the 

 young insect, about Jj inch. 



In the second stage of its existence the insect does not generally differ 

 from its later form, but the antenna3 have only nine instead of eleven joints, 

 and the fringe of strong hairs on the inner edge of the tibia and tarsus is 

 much less developed. 



It will be seen that the anteunfe follow the same gradation as in the 

 genus leery a (described by me last year), increasing fi-om six to nine, and 

 lastly to eleven joints. 



It remains to decide the affinities of this insect. I have put notes of 

 interrogation at the head of this description because I cannot be quite 

 certain that Coilostoma is new. The whole group of the Monophlebidfe 

 requires, I think, more investigation. Most of the species are tropical, or 

 at least, found in out-of-the-way places, and the facilities for examination 

 and description have been by no means great. In one genus of the group, 

 viz., Monophlebus, I believe that the females have never been described, and, 

 as I have not the male of Ccelostoma, 1 cannot distinguish it from Mono- 

 phlebus, with this exception, — that I cannot find that Monophlebus is destitute 

 of a rostrum. In fact, Ccelostoma possesses the characters, as far as I am 

 aware, of most genera of the group. The young insect resembles Calli- 

 pappus ; the trochanters of the adult female are like Porphyrojjhora ; the 

 callosities of the body resemble Drosicha. But it differs from all, and 

 unless it is the female of Monophlebus, it must be a new genus ; but the 

 frequency of the males of Monophlebus elsewhere, and their rarity here, 



