240 THE CANADIAN ENTOMOLOGIST 



Acanthocephala terminalis Dall. 



Metapodius terminalis Dallas, List of Hem., II, p. 432, 1852. 



Metapodius instahilis Uhler, Proc. Bost. Soc. Nat. Hist., vol. 

 XIV, p. 98, 1871. 



This is the smallest species of the genus and is the most con- 

 stant in its characters. Normally it is very dark, almost black. 

 The posterior femora in the male is only slightly larger than in 

 the female. 



The authors are unable to separate Uhler's instahilis from this 

 species, and feel warranted in placing it in synonymy with ter- 

 minalis Dall. 



Specimens in the National Museum collection record its 

 distribution from New York west through Illinois and Missouri 

 and south to Texas. 



Acanthocephala granulosa Dall. 



Metapodius granulosa Dallas, List Hem., II, p. 430, 1852. 



Diactor alata Herr.-Sch., Wanz. Ins., VI, p. 53, 1842. 



Metapodius thomasii Uhler, Hayden's Surv. Mont., p. 339, 

 1872. 



The wide dilatation of the posterior tibia which extends to 

 the apex is characteristic of this and the following species. In 

 latipes Drury, however, the dilatation is widened and broadly 

 rounded at the apex, while in this species it is slightly and gradually 

 narrowed. Typical specimens have their elytra of a distinct 

 mahogany brown. The long, bright orange fourth antennal seg- 

 ment with the bright orange tibia of the first two pairs of legs are 

 also characteristic. It is a large species and is known to occur in 

 Arizona, New Mexico and Texas, as well as throughout Central 

 America. 



Acanthocephala latipes Drury. 



Cimex latipes Drury, 111. Nat. Hist., Ill, p. 62, 1782. 



Lygaeus compressipes Fabr., Syst. Rhyng., p. 209, 1803. 



Acanthocephala albicollis Dall., List, HI, p. 427, 1852. 



The characters as mentioned in the key to the species will 

 suffice to distinguish this species. It might also be remarked that 

 the fourth antennal joint is extremely long, and the posterior- 

 lateral angles of the thorax terminate in almost a spine. 



Specimens &re at hand from Panama and Costa Rica. 



