324 Professor E. B. Poulton on 
PAGE 
II. NEUROPTERA . : : : 3 : : -/| 398 
A, THE PREY OF ODONATA (DRAGONFLIES). 5) ay 
B. THE PREY OF PANORPIDA (SCORPION-FLIES) . 402 
III HEMIPTERA ; : : , : : : - 403 
THE PREY OF HEMIPTERA . : ‘ : . 404 
V. ORTHOPTERA . : . : : é : . 406 
THE PREY OF MANTIDA AND LOCUSTIDA  . 406 
V. COLEOPTERA. 408 
PREDACEOUS COLEOPTERA AND THEIR PREY . 409 
INTRODUCTION TO Part I. 
Tue following memoir, including numerous and varied 
groups of insects, has made large demands on the time and 
work of many naturalists. Itis a pleasant duty to speak 
of the extremely kind and sympathetic help by which 
alone the publication has been rendered possible: help in 
bringing together a large mass of original records; help in 
working out the material and in searching through the 
literature of the subject. I must admit that in the desire 
for the utmost fulness and precision in the data and 
the determinations, my friends have been somewhat bur- 
dened with correspondence : the one to whom I owe the 
most even likened me to a “pom-pom”! I fear indeed 
that among the chief reasons for welcoming the final 
appearance of the paper will be a feeling of relief and 
security, of a haven of rest where the inexorable letter- 
writer will cease from troubling. 
In addition to the solid contributions of material upon 
which this paper has been built, the unceasing contact 
with sympathetic friends has been in itself a source of 
encouragement and inspiration. Where is there a subject 
the equal of natural history in bringing about friendly 
co-operation in the labour of accumulating evidence or of 
solving some difficult problem ? 
The material of this memoir is far more due to the 
efforts of Colonel J. W. Yerbury than to any other 
naturalist. It was chiefly but by no means exclusively 
collected in the British Islands, and has contributed to 
nearly all the groups of predaceous insects. In the section 
devoted to Himpidx, the specimens collected by Colonel 
Yerbury more than equal those obtained by all other 
naturalists put together. 
Next in importance is the splendid series of examples 
collected by Mr. Guy A. K. Marshall in South Africa, the 
great majority from the neighbourhood of Salisbury, 
