SUBFAMILY VII. — RHYPAROCHROMIN^E. 385 



Stal, separates the subfamily into six tribes. Of these five are 

 represented in North America and the eastern states. 



KEY TO EASTERN TRIBES OP SUBFAMILY RHYPAROCHROMINvE. 



a. Fourth ventral with the two small glandular opaque spots near side 

 margin widely separated, the hind one much nearer the hind 

 margin of the segment than to the front spot (fig. 70). 

 b. Pronotum with side margins of front lobe obtusely rounded or 

 terete, never carinate or laminate-expanded ; disk of pronotum 

 usually strongly constricted transversely to form two distinct 

 lobes, the front one usually with a ring-like collar behind front 

 margin. Tribe I. Myodochini, p. 385. 



bb. Pronotum with side margins of front lobe not obtuse or terete, but 

 carinate or laminate-expanded ; disk of pronotum rarely strongly 

 constricted transversely to form two lobes, or if so, the front 

 one rarely with a collar and the head then strongly exserted. 

 c. Side margins of pronotum carinate, not laminate-expanded; pro- 

 notum usually wholly black or reddish-brown, the hind lobe 

 rarely paler; head deeply inserted in thorax, rarely (Ozophora) 

 more exserted and the pronotum then with a collar ; hind tibia? 

 usually pilose without rigid bristles. 



Tribe II. Rhyparochromini, p. 414. 

 cc. Side margins of pronotum and in part the costal margin of corium 

 laminate-expanded and usually in part pale; pronotum with 

 hind lobe usually pale or variegated with pale; hind tibia? fur- 

 nished with long rigid bristles. 

 d. Three basal segments of antenna? without rigid bristles ; nar- 

 rowly expanded side margins of pronotum not or very sparsely 

 punctate ; disk of front lobe of pronotum usually smooth or 

 sparsely punctate. Tribe III. Beosini, p. 423. 



dd. Three basal segments of antenna? provided with rigid setose 

 bristles ; widely expanded side margins and disk of pronotum 

 and corium usually thickly punctate. 



Tribe IV. Gonianotini, p. 428. 

 aa. Fourth ventral with the posterior glandular opaque spot on sides 

 placed more closely to front spot than the hind margin of the 

 segment, sometimes the segment with a third spot near hind 

 margin; side margin of pronotum usually expanded, often more so 

 between the lobes. Tribe V. Leth^eini, p. 429. 



Tribe I. MYODOCHINI Stal, 1872b, 51. 



This tribe, as characterized in the above key, comprises spe- 

 cies less depressed and more narrowly elongate than those in 

 the tribes which follow. The tribe is represented in the eastern 

 states by twelve of its fourteen known North American genera. 



KEY TO EASTERN' GENERA OF MYODOCHINI. 



a. Head very elongate, its base drawn out into a long cylindrical neck; 

 the two lobes of pronotum subequal in length, front one with a 

 distinct collar (fig. 83). I. Myodocha, p. 387. 



