324 Professor E. B. Poulton on 



II. NEUROPTERA 



A. THE PREY OF ODONATA (DRAGONFLIES) . 



B. THE PREY OF PANORPID.E (SCORPION-FLIES) 

 III HEMIPTERA 



THE PREY OF HEMIPTERA .... 

 V. ORTHOPTERA 



THE PREY OF MANTIDiE AND LOCUSTID^ 

 V. COLEOPTERA 



PREDACEOUS COLEOPTERA AND THEIR PREY 



PAGE 



398 

 399 



402 



403 

 404 

 406 

 406 

 408 

 409 



Introduction to Part I. 



The following memoir, including numerous and varied 

 groups of insects, has made large demands on the time and 

 work of many naturalists. It is 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 w^hom 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 Empid^, 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, 



