March. 1919.] AIcAtee: Berytidje (Heteroptera) . 



79 



Explanation of Plates. 

 Plate XIII. 

 Fig. 1. Cacama valvata (Uhler). 

 Fig. 2. Cacama f areata Davis. Type. 

 Fig. 3. Cacama v arte gat a Davis. Type. 

 Fig. 4. Cacama variegata Davis. Allotype. 



Fig. 1 

 Fig. 2 

 Fig. 3 

 Fig. 1 

 Fig. 5 



Plate XIV. 

 Cacama californica Davis. Type. 

 Cacama dissimilis (Distant). 

 Cacama carbonaria Davis. Type. 

 Cacama crepitans (Van Duzee). Cotype. 

 Cacama maura (Distant). 



KEY TO THE NEARCTIC GENERA AND SPECIES OF 

 BERYTID^ (HETEROPTERA). 



By W. L. McAtee, 

 Washington, D. C. 



The Berytidae are an assemblage of small- to medium-sized bugs 

 of slender build. The long filiform antennae are distinctly elbowed 

 and the head has a definite constriction or transverse sulcus in front 

 of the ocelli. The first joint of the antenna, and the femora are cla- 

 vate. and the slender legs are more or less thickly beset with short 

 bristles or bristled tubercles. The scutellum is small, leaving the tri- 

 angular space between the clavi partly open. 



In the following treatment of the family descriptions of genera 

 do not repeat the family characters, nor do those of species reiterate 

 the characters of their respective genera. Distribution is not given 

 in detail for the most common and widespread forms. The measure- 

 ments of total length refer to the body proper, between apices of tylus 

 and elytra, and do not include the antennae. 



It has been the custom to refer to certain metathoracic tubercles 

 of the Berytidae as breathing-horns, or the equivalent of that term in 

 various languages. It is evident, however, that these organs in their 

 entirety are exact homologues of what are called in all the other 

 groups of Heteroptera possessing them, ostioles witli their accom- 



