Predaceous Insects and their Prey. 329 
the predaceous species frequently or even normally attack 
insects which are themselves predaceous or parasitic, in 
such instances tending towards the preservation rather 
than the destruction of insect life. It is unnecessary to 
quote instances when they will be found in numbers 
scattered through the following tabulated records; but I 
may allude to the amusing “reciprocity exhibited by 
examples 268 and 293. In the former an Empid fly was 
devouring the Anthomyid fly, Caricea tigrina: in the latter 
Caricea tig grina was devouring an Empid ! 
In order to facilitate reference, all records in Part I of 
this memoir have been conspicuously numbered. In Part 
II, dealing with the predaceous Hymenoptera, the reference 
numbers will be confined to original records, published 
for the first time. The difference in method is due to 
the small proportion in Part I of examples previously 
published, as contrasted with their immense preponderance 
in Part II. 
The study of the original records here brought forward and 
their comparison with the results obtained in the future, 
will be aided by a statement, made whenever possible, of 
the collection in which each example is to be found. The 
words, “In Hope Dep.,” “In Brit. Mus.,” etc., appearing 
beneath the name of the predaceous species implies that 
the prey as well as the captor exists in the collection indi- 
cated. A modified statement will make it clear when the 
captor alone or the prey alone is known to be in existence. 
References to previous publication will in Part I be found 
under the name of the observer. For the sake of brevity 
the publications of the Entomological Society of London 
are indicated by no more than the abbreviation “Trans.” or 
“ Proe.,” together with the year of publication and page. 
In Part I the Orders to which the predaceous insects 
belong are treated merely in the order of the number of 
records. It will at once be recognized that evidence of 
importance has only been obtained in the Diptera of Part 
I and the Hymenoptera Aculeata of Part II. 
I. DIPTERA. 
The records in the first part of this memoir are set forth 
in a tabular form, beginning with the family which stands 
foremost among predaceous Diptera,—the Asilidez. 
A. ASILIDZ AND THEIR PREY. 
