HEMIPTERA. 



125 



Classification of the Heteroptera. 



( For advanced students ) 



In order to use the following table for determining the families of 

 bugs, the student should become familiar with the names applied to 

 different parts of the fore-wings of these insects. The thickened 

 basal portion is composed of two pieces joined together at their 

 sides; one of these is narrow and is the part next 

 to the scutellum when the wings are closed (Fig. 

 141, cl)\ this is distinguished as the clavus (cla'vus). 

 The other broader part is the corium (co'ri-um) FlG __ 

 (Fig. 141, co). The terminal portion of the wing- 

 cover is designated as the membrane (Fig. 141, m.) 

 In certain families a triangular portion of the terminal part of the 

 corium is separated as a distinct piece ; this is the cuneus (cu'ne-us) 

 (Fig. 141, en). In certain other cases, a narrow piece on the costal) 

 margin of the corium is separated by a suture ; this is the embolium 

 (em-bo'li-um) (Fig. 141, e). 



wing-cover of 

 bug. 



Fig. 144. 

 Capsidce. 



Fig. 145. 

 Pyrrhocoridce. 



Fig. 146. 

 Lygceidce. 



Fig. 147. 

 CoreidcB. 



TABLE FOR DETERMINING THE FAMILIES OF THE 

 HETEROPTERA. 



A Antennae shorter than the head, and nearly or quite concealed in 

 a cavity beneath the eyes. 

 B. Hind-tarsi without claws. 



C. Fore-tarsi flattened with a fringe of hairs on the edge, and 

 without claws ; head overlapping the prothorax. p. 129. 



Corisid^e. 

 CC. Fore-tarsi of the usual form, and with two claws ; head in- 

 serted in the prothorax. p, 130 Notonectid^e. 



