( XXV ) 
Hydroecia lucens and U. cvinanensis in theii' genitalia, should 
present no definitely marked superficial character in the imago. 
Dr. Karl Jordan considered that the four species, as 
proved by the differences in the genitalic structures, were 
abundantly distinct, and brought forward a parallel case 
among the Attacids. Here, two species with almost identical 
imaginal facies were separated first of all on the ^ genitalia, 
and afterwards proved by the larvae and pupae to be essentially 
different in all their stages. He considered the differences in 
structure of the $ genitalic organs as being particularly 
interesting. 
Dr. T. A. Chapman, M.D., F.Z.S., read the following notes 
entitled “ Xanthandrus comtus, Namr., a Correction.” 
On June 6, 1906, Prof. Poulton read a paper on “ Predaceous 
Insects and their Prey,” which appears in our Transactions 
for that year. On p. 396 are some remarks on Xanthandrus 
comtus, which involve cei’tain misapprehensions as to facts, 
and consequently some probably erroneous deductions. I 
pointed these out to Prof. Poulton at the time, and they were 
to be corrected in a further paper on the same subject shortly 
to appear. It seems, however, that the pressure of other 
mattei’S is postponing indefinitely the completion of that paper 
by the professor. I think, therefore, it is desirable that the 
correction should not be further delayed. 
I had recorded observations on X. comtus, showing that 
the larva fed on the larvae of certain Tortrices, which were 
gregarious in this modified sense that, though not necessarily 
in association, a number were always found on the same plant, 
probably all from one batch of eggs. 
Prof. Poulton reports an observation by Mr. Lyle of the find¬ 
ing of a full-fed larva of X. comtus, which had reduced to a dry 
and empty skin a larva of Scotosia, undulata,, a Geometrid moth. 
The misapprehensions that Prof. Poulton adds to this fact 
relate both to A", comtus and to S. undulata. 
First, as to the habits of the larva of X. comtus. When this 
larva finds itself amongst a number of larvae suitable for food 
and of considerable size, as I have not unfrequently found it 
amongst those of Hastula hyerana, it does not mind the size of 
its victim, and often attacks one much too large for it. Of this 
