x INTRODUCTION. 
Specific mimicry in the Capside is exhibited between Paracalocoris annulatus and 
Lampethusa anatina and between Proba gracilis and Lygus tribulis—all local species 
described in this volume. Other, though less pronounced, mimetic affinities may be 
seen on examining the figures belonging to other genera and species of this family. 
In conclusion, I have to acknowledge my obligations for valuable help afforded 
in the preparation of this volume. The late Dr. Stal died before the first part 
appeared, but not before he had assisted me with some identifications, and I subse- 
quently had an opportunity of examining the types of many of his species through the 
considerate courtesy of Dr. Aurivillius, of the Stockholm Museum. My late friend 
Dr. Signoret placed his collection unreservedly at my disposal, and I had the privilege 
of examining and in many cases figuring the Mexican types which it contained. To 
the authorities of the Berlin and Vienna Museums our thanks are also due for 
Mexican specimens submitted for identification. 
W.L. D. 
May 1893, 
