39 
Four Odonata (Dragon-flies) from the Sierra Guadarrama 
(July 1902) were presented by the Professor. Omitted acci- 
dentally when the rest of the collection from this locality was 
catalogued in 1904. 
ADDITIONS TO THE BRITISH COLLECTIONS IN 1902. 
During his visit to England in 1902, Mr. Guy A. K. Marshall 
collected at the end of August and beginning of September, 
near Wroxham, Norfolk, and presented the fine collection 
which he then made, to the Hope Department. The series, 
which has now been catalogued, contains 277 Hymenoptera 
and 198 Diptera, in addition to the following bionomic col- 
lection :— 
A Stratiomyid fly, Berzs vallata, 9, mimicking a common 
Tenthredinid, the mimic and a couple of the models taken on 
Umbelliferous flowers within a few yards of each other (Sept. 4). 
This, it is believed, is the first record of mimetic resemblance 
to this particular form of model, although Tenthredinid larvae 
have been long known to be mimicked by the young larvae of 
Endromtis versicolor. 
A beautiful mimetic, or synaposematic group of g black 
and yellow-banded specimens captured in close proximity 
on Umbelliferous flowers (Sept. 1). Of the individuals 5 are 
Aculeate Hymenoptera, 1 an Ichneumonid, and 3 Diptera. 
Three examples of the Fossorial wasp, Oxydelus uniglumis, 
together with its Dipterous prey (Sept. 5). 
The fly Scatophaga, with a smaller fly which it had cap- 
tured (Sept. 5). 
An interesting series of specimens illustrating important parts 
of the life-history of Crabro chrysostomus. First,11 Syrphid flies 
stored up in burrows in rotten wood made by the Fossor ; 
2, of the latter bred from cocoons found in the burrows; a large 
number of Chalcid parasites which emerged from three other 
cocoons. The specimens were collected, Sept. 5, and the 
insects bred out in Oxford during the following year (1903). 
An examination of the 11 Dipterous victims, conducted with 
