HEM11TEKA HETEROPTEKA PENTATOMID.E. 439 



oblique, and arcuate, the trout latenil angles always rounded. sonietime> BO 

 nuicli as to disappear. Scutellum usually small, never larue. triangular, 



with straight siilcs, ut' \arvin;j- proportions but never longer than broad. 

 reaching from less than a third to one-halt way to the tip of the alidomen. 

 A lar^-e number of species occur in our Western Tertiaries, all found at 

 Florissant and one also at (ireen River. 



Tabli a f On i/ii i-ii M at' I'rocydnu*. 



Auterior half of thorax iinifunnly depressed. 



Head so sunken in the prothorax that its front margin forms a regular curve with that of the 



tlnnax ] 



Hi'ad sensibly projecting bc\oud fnint line of body. 



Head only a fonrtli the width of the thorax 'J. /' 



Head much less than half the width of the abdomen, at least a third the width of the thor:i\. 

 Thorax scarcely inure than twice as liroad as its middle length. 



Larger species; einurginution of apical margin of thorax relatively shallow. 



:;. /'. ilinfii'. 

 Smaller species: eiiiargiiialion of apical margin of thorax relatively deep and abrupt. 



4. /'. I/U: 



Thorax nearly or i]uite three times as broad as its middle length. 



Larger species; head more than one- third as wide as the body 5. /'. n fir/nut. 



Smaller species; head less than one third as wide as the body il. / 



Head half the width of the abdomen 7. /'. ealnni. 



Anterior half of thorax with lateral bosses 8. /'. niainil/itniii. 



1. I'KOCYDNUS PRONUS. 

 PI. 28, Fig. 5. 



Head rounded, broader than loiijr, deeply sunken in the thorax, it- 

 broad anterior curve almost continuous with the rounded sloping l;i' 

 angles of the thorax, the eyes small and in advance of the middle. 'Thorax 

 shaped much as in 1'. devictus, but with a liroad and especially deep. 

 rounded, almost angular cinar^ination to receive the head, about a third 

 the width of the thorax : its basal margin is not indicated on the plate, but 

 should unite the extn me liases of the hemelvtra in a straight line: the sur- 

 face shows excessively shallow crowded punctuation. Scutellum \ erv 



, triangular, reaching half-way to the tip of the abdomen, broader than 

 -. Hemelytra with the curium occupvhi';- the basal three-fifths, uni- 

 formly coriaceous \vitl, punctuation like the thorax, and an excessive! v 

 delicate impressed submarginal line. Hind tibiae densely spined. Alidomen 



verv broad and full, ^carceK longer than l>n>ad. \Vhole bod\- black, the 

 coriuni of the hemcKtra hardlv less dark. 



Leii-th of body, :>"""; breadth. :i.l""". 



Floi-iant. ( hie specimen. No. 144'Jii. 



