INTRODUCTION. 1x 
Nearctic genera, i.e. Central Am. gen. also found north of Mexico. . . 8 
N eotropical genera, 2. €. ” » ” south of Panama. . . 7 
Neogean genera, 7. é. ” 9 ” north of Mexico and 
also south of Panama . . . . 1 eee eee ee ee eG 
Genera at present only recorded from Central America. . . . . . + 99 
I have only been able to find a record of one of these genera as inhabiting the 
Antilles ; but this, of course, denotes merely a want in entomological knowledge. A few 
of the genera are very widely distributed. Miris, Megacelum, and Lygus are found in 
Europe, Africa, and Asia, the first-named being also recorded from Polynesia, and 
probably existing in Australia. Calocoris has a wide Palearctic distribution. 
In the Tertiary deposits of North America, Mr. Scudder has recognized the remains 
of Hadronema, Pecilocapsus, Carmelus, and Fuscus. 
The total enumeration of the preceding five families of Central-American Hetero- 
ptera is thus seen to amount to 323 genera and 1108 species, the distributive 
relationship of which is largely with the fauna south of our area, and one which 
will prove to be still larger when that fauna is more worked and described. Our 
collections have been particularly exhaustive from Mexico, Guatemala, and the State 
of Panama; from Costa Rica our material was smaller, but it yet produced an 
exceedingly large percentage of new species, and the writer looks to Costa Rica for 
many future additions to the Central-American fauna. ‘The numbers of new genera and 
species described are as follows:—Pentatomide, genera 11, species 120; Coreide, 
genera 4, species 63; Lygeide, genera 26, species 111; Pyrrhocoride, genera 3, 
species 13; Capside, genera 61, species 274—total: genera 109, species 581. 
Mimicry is not uncommon among the Heteroptera, and in the present volume there 
are given several good instances which a reference to the coloured figures will render 
quite palpable. Mimetic resemblances to ants are found in Galeottus formicarius, 
Dist., a species of Coreide, and in Pheaxr formicarius and P. balteatus, Dist., 
belonging to the Pyrrhocoride. In the Lygeide we have in Toonglasa forficuloides, 
Dist., a remarkable mimic of a species of Forficula. The Capside exhibit this pheno- 
menon toa greater extent than any of the preceding families, not only mimicking 
outside genera, but also exhibiting specific mimicry amongst themselves. Thus, the 
genus Lygdus not only possesses a strong Lygeid appearance, but one species 
(L. mimicus, Dist.) bears a remarkable resemblance to the genus Oncopeltus, and I 
at first casually considered this Capsid as certainly belonging to it; whilst the genus 
Cymus, belonging also to the Lygwide, is mimicked by the Capsid genus Falconia. 
BIOL. CENTR.-AMER., Rhynch., May 1893. : b 
