398 THE ENTOMOLOGIST. 
stated that his young carrots were injured by what he seemed 
to consider the same creature, but, from examples he sent, 
the depredators in this case were evidently the larve of a 
Dipterous insect, Psila Rose. The larve first showed their 
presence by a slightly crumpled appearance of the leaf, 
which commenced to drop. On taking up the carrot no 
root-fibres are observed, the slender portion being dry and 
brittle, and in the centre is found the larva. He observed that 
all his neighbours’ gardens were infested in a similar manner. 
Mr. Druce said that the carrots in his brother’s garden, at 
Kingston, were destroyed by the same larve. 
Monograph of Stylopites.—Mr.S.8. Saunders read a paper 
on these parasites, dividing them into subfamilies, according 
to the Hymenopterous tribes with which they are asso- 
ciated: namely (1), the true Stylopidz, found with the 
Mellifera of Latreille; (2) the Myrmecolacide, with the For- 
micide ; (3) the Xenide, with the social wasps; and (4) the 
Pseudoxenide, with the solitary wasps and Fossores; these 
latter tribes coinciding more or less in their habits and 
economy, and requiring about eight or nine months (from one 
year to the next) to attain maturity ; involving a correspond- 
ing detention for their Strepsipterous dependents; whereas 
the true Xenidz, corsorting with the social Vespide, must be 
reared from their primary hexapod condition in from thirty 
to forty days, such being the term within which the larve of 
the social Vespidz attain the imago state; the females of the 
latter hybernating with those of Xenos, which produce their 
larval brood the ensuing vear; whereas the Pseudoxenide, 
after their long-protracted larval condition as aforesaid, must 
produce their young the self-same year in which they them- 
selves complete their transformations, in order that their brood 
may obtain access to the future larva-cells of their non- 
hybernating foster-parents. As a sectional division for those 
which associate with the Fossores (as first noticed by Dufour), 
Mr. Saunders proposed the term Paraxenide. The genera 
and subgenera recorded were eight in number, comprising 21 
species, as follows:—Halictophagus, 1; Stylops, 5; Hylec- 
thrus, 3; Elenchus, 3; Myrmecolax, 1; Xenos, 2; Pseu- 
doxenos, 3; and Paraxenos, 38. Of these 16 were European 
(whereof 7 British), and 5 extra-European. 
