HEMIPTERA HETEROPTBRA. 



41 



B. Membrane with double generally elongate trian- 

 gular rectilinear or curvilinear areolets. 

 a. First joint of the hind tarsi twice or tlirice longer 



than the second joint. 

 * Prothorax as broad as long, reverse-trapeziform, 

 much straightened hindwurd. Mesothorax un- 

 covered. - . . - . Myrmecoris. 

 ** Protliorax elongate-trapeziform. Mesothorax 

 covered. 

 t Head with rounded sides. ... Pithanus. 

 •ft Head with parallel sides. 

 X Protborax with no rim on the fore border. 

 § Cheek-plates short, almost semicircular. 

 X Tip of the vertex truncated, even. 



o Rostrum extending to the second ventral segment. Miris. 



oo Rostrum extending to the hind border of the 



mesopectus. _ - . - _ Brachytropis. 



X X Tip of the vertex conical. 

 -i- First joint of the rostrum longer than the under 



side of the head. .... Notostira. 



-i — »- First joint of the rostrum as long as the under 



side of the head. - . . - Lobostethus. 



§§ Cheek-plates long, linear. 

 X First joint of the rostrum longer than the under 



side of the head. - _ - - Megaloceroea. 



X X First joint of the rostrum as long as the under 



side of the head. . _ _ - Trigonotylus. 



XX Protborax with a rim on the fore border. 

 § Sides of the protborax foliaceous or sharp-bordered. 

 X Tip of the vertex forming a prominent cone. - Acetropis. 



X X Tip of the vertex rounded. 



o Eyes half-round. Rostrum extending to the hind 



border of the metapectus. ... Leptopterna. 



00 Eyes oval, almost reniform. Rostrum extending 



to the hind border of the mesopectus. - - Teratocoris. 



§§ Sides of the protborax truncated or rounded. 

 X First joint of the hind tarsi not thicker than the 

 other joints. 

 Second joint of the antennae clavate. - Cremnocephalus. 



oo Second joint of the antennae linear. - - Oncognathus. 



XX First joint of the tarsi much thicker than the two 

 following joints. 

 o Second joint of the antennae clavate. First joint 



of the hind tarsi cylindrical. - - " - Alloeotomus. 



00 Joints of the antennae cylindrical. First joint of 



the hind tarsi clavate. . - - - PACHYPfERNA. 



b. First joint of the hind tarsi shorter than the 



second joint, or equal to- it in length. 

 * Head above transversely oval or triangular. Eyes 



contiguous, or nearly so. 

 t Protborax in front with a rim or swelling. 

 t Neck arched, with no transverse border or rim. 



