Predaceous Insects and their Prey. 393 
Dolichopodidxe and Anthomyidx.*—The single record of 
a victim captured by a species of each of these families 
will I trust be of value in calling the attention of natur- 
alists to the fact that these flies are predaceous, and that 
specially directed observation will surely yield the material 
upon which to base a sound conclusion. 
Cordyluridx.—The fact that” flies of the genus Scato- 
phaga are predaceous is fairly well known, although the 
extent of their attacks is probably insufticiently recognized. 
We here find 10 records as the result of the observations 
of five observers in several very different British localities. 
The prey is remarkably scattered through varied Dipterous 
groups, as will be seen at a glance in the following table :— 
The Prey of Scatophaga. 
| ls Pe 
3 aS he = 
| = § cS = 
lags = = 5S] 
& & ed (as 
| = $ = S 
5 5 = iS 
2) QR 5 iS 
hee a 
7 = tw ous - ae } 
HyMENOPTERA .| Tenthredinide . | | ie 
Ua A 
Te | | | 
DieteRA . . .| Mycetophilide . | | ‘ey 
| = — | 
Bibionide . . .|| | | ool 
Limnobide. . .|| 1 il 
| | 
+ << SS eS eee eee 
Syrphidz | | 1 
Dexine. . . «| peal 
Muscine | 1 
Anthomyide . «| et a | 
Wotals; © o2: Gert. 1 AN | al Rare o.0 
=| | — | 
Males: s. 25 40. | 1 | “| 
ewe orev aes) ot: a $i Pe Mee |= | 
| | 
Females. . . 1 1 | 3 
* Mr. G. H. Verrall informs me that all the Dolichopodidx are 
predaceous. Only one sub-family of the Anthomyide is predaceous, 
namely, the Cenosine which are closely allied to the Cordyluride. 
