of the Genus Palmon of Dalman. . '26f 
~ 
tarsorum omnium dilatato, necnon ceconomia specierum que 
in ficubus more Blastophagorum habitant. 
Sp. 1. Pachytomus Klugianus, Westw. 
Cupreo-zeneus, tenuissime punctatissimus ; antennis basi tantum 
luteis, abdomine piceo-fulvo, apice nigricanti; pedibus 4 
anticis pallide flavescentibus, posticis piceis, geniculis luteis. 
Long. corp. lin. 14. 
Habitat in ficubus Egypti. D. Klug. 
In Mus. Westwood. 
XLI. On the Habits of the Genus Sialis. By 
W. F. Evans, Esq. 
[Read 25th April, 1844. ] 
As THE habits of some of our most common insects appear to be 
little known, I have thought that the following observations on the 
natural history of the Salis lutarius may probably be new and not 
entirely devoid of interest. 
On the 25th of April I found, on the rushes round the margin 
of a small pond, a great many patches of eggs, and shortly ob- 
served many of the Svalis lutarius depositing them. 
They form large patches of from two to three inches in length, 
generally encircling the whole rush near the top, but sometimes 
deposited on one side only, and extended to about a line in breadth. 
I counted 100 in a square line, so that each batch may be fairly 
considered to contain from 2000 to 3000 eggs; the greater por- 
tion of which must consequently perish either in the egg or larva 
state; as, common as the insect is, and widely distributed through- 
out the country, we should be perfectly overwhelmed with the 
swarms of the perfect insect if such were permitted, when it is 
considered that round this one small pond there could not have 
been less than 100 patches of them. 
The eggs are of a very singular form, and placed in a slanting 
position (Pi. XIX. fig. 4). 
The females, whilst depositing them, appeared perfectly motion- 
less on the rush, and varied considerably in size, being from five 
