HEMIPTERA— HETEROrXEllA— PENTATOMID.^-:. 439 



oblique, and arcuate, tlie front lateral angles always rounded, sometimes so 

 much as to disappear. Scutellum usuall}' small, never large, triangular, 

 with straight sides, of varying proportions but never longer than broad, 

 reaching from less than a third to one-half way to the tip of the abdomen. 

 A large number of species occm- in our Western Tertiaries, all found at 

 Florissant and one also at Green River. 



Table of the species of Procydnus. 



Anterior balf of thorax iiDiforinly depresseil. 



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



thorax 1. P.pyoniiH. 



Head sensibly projecting lieyond front line of body. 



Head only a fourth the width of the thorax 2. P. devicliis. 



Head much less than half the width of the abdomen, at least a third the width of the thorax. 

 Thorax scarcely more than twice as broad as its middle length. 



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



3. P. divexm. 

 Smaller species; emargination of apical margin of thorax relatively deep and abrupt. 



4. P. quietus. 

 Thorax nearly or quite three times as broad as its middle length. 



Larger species; head more than one-third as wide as the body 5. P. reliquus. 



Smaller species; head less than one third as wide as the body 6. P. eesptrus. 



Head half the width of the abdomen 7. P. eatoni. 



Anterior half of thorax with lateral bosses 8. P. mamillanua. 



1. Procydnus pronus. 

 PL 28, Fig. 5. 



Head rounded, broader than long, deeply sunken in the thorax, its 

 broad anterior curve almost continuous with the I'ounded sloping lateral 

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

 shaped much as in P. devictus, but with a broad and especially deep, 

 rounded, almost angular emargination 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 extreme bases of the hemelytra in a straight line ; the sur- 

 face shows excessively shallow crowded punctuation. Scutellum very 

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

 long. Hemelytra with the corium occupying the basal three-fifths, uni- 

 formly coriaceous, with punctuation like the thorax, and an excessively 

 delicate impressed submarginal line. Hind tibia; densely spined. Abdomen 

 very broad and full, scarcely longer than broad. Whole body black, the 

 corium of the hemelytra hardly less dark. ' 



Length of body, 5"""; breadth, S.l"""'. 



Florissant. One specimen. No. 14426. 



