384 TERTIARY INSECTS OF NORTH AMERICA. 



Table of the genera of fossil Myodochina. 



Anterior and posterior lobes of thorax with independent lateral curves.. .. .(Div. jtl yo<lo4'h;iri;i. 



Middle femora as long as Wie width of tbe body at their insertion 1. Ligyrocoriu. 



Middle femora shorter than the width of the body at their insertion. 

 Anterior lobe of thorax with the sides arcuate. 



Minute species, less than four millimeters in length 2. Stenopamera. 



Larger species, not less than five millimeters. in length. 

 Anterior much longer than posterior lobe of thorax. 



Anteume no longer than head and thorax ; terminal joint no broader than middle 



of second joint 3. Calojiamera. 



Anteniiie as long as head, thorax, .and scntellum ; terminal joint incrassated. 



4. Phrudopamera. 



Anterior lobe of thorax a little shorter than the posterior 5. Cltolula. 



Anterior lobe of thorax with the sides oblique and straight. 

 Anterior and posterior lobes of thorax a.bout equally long. 



Larger forms. Antennie more than half as long as body ; head as broad as middle of 



thorax; abdomen lateral!} 7 expanded 6. Lilhocoris. 



.Smaller forms. Antenna only half as long as body; head much narrower than mid- 

 dle of thorax ; abdomen not laterally expanded 7. Copltocoris. 



Posterior lobe of thorax distinctly shorter than anterior. 



Pusierior margin of thorax ungulate, the posterior lobe twice as long in the middle as 



at sides. H. Eucorites. 



Posterior margin of thorax truncate, the posterior lobe of equal length throughout. 

 Antenna; as long as head and thorax together, or longer; head longer that 



broad 9. Procoria. 



Aut.uuuiB shorter than head and thorax together ; head broader than long. 



10. Clereacoris. 

 Anterior and posterior lobes of thorax distinguishable only, if at all, by the transverse impressed line 



of the upper surface (.Div. Riiypurocliromariit.) 



Eyes small, globular; head not broader than frout of thorax. 



Minute species, usually less than 4 nim (in one instance as much as 4.5""") in length. 

 Autenme only as long as head and thorax together. 



Anterior border of thorax very much shorter than the posterior ; or, if not, much longer 



than the length of the thorax. 



Corinm of hemlytra reaching only the middle of the abdomen ... 11. Trapezonotus. 

 C'orium of hemelytra reaching distinctly beyond the middle of the abdomen. 



12. Linntra. 

 Anterior border of thorax but little shorter than the posterior and of the same length 



as the thorax \\\. RhyparochrotAHS. 



Antenna! fully half as long as body. 



Second joint of antennae scarcely longer than third or fourth II. I'acliymerus. 



Second joint of anteume much longer than either of the succeeding .. 1.1. Tiromerns. 

 Larger species, usually more than . r i'" m (in one instance as little as 4.7 mm ) in length. 



Autenmo nearly or quite half as long as the body, the last joint scarcely or not incrassated. 



Hi. Lithochromus. 

 Antenna) not or scaroely longer than head and thorax together, the last joint usually a 



little iucrassated. 

 Second joint of antenna) longest. 



Thorax considerably less than twice as broad as long 17. Coplochromiis. 



Thorax much more than twice as broad as long 18. Prolyyams. 



Last joint of antennae lougest. 



Eyes at base of head; thorax punctate ; sides of al>domen expanded, usually beyond 



the closed hemelytra 19. Ifccrochromiis. 



Eyes in middle of head ; thorax smooth ; sides of abdomen not expanded laterally 



beyond the hemelytra 20. Ejcitclm. 



Eyes large, lenticular, half as long as the thorax; head considerably broader than the front of the 

 thorax 21. Cryptochromut 



