404 TERTIARY IXSECTS OF NORTH AMERICA. 



emarginate ; a slight median sulcation, but scarcely any sign of a depres- 

 sion at the apex. Surface nearly smooth, but coarsely, distantly, and 

 faintly punctate. Corium of hemelytra clear. 



Length, 525 mm ; breadth, 2.1 mm . 



Florissant. One specimen, No. 6390. 



3. LlTHOCHROMUS MORTUARIUS. 



PL 26, Fig. 2. 



Antennre slightly longer than head and thorax together. Thorax sub- 

 quadrangular, less than half as broad again as long, less than half as long 

 again as the head, and only as long as the width -of the head, broadest 

 before the base, with rather strongly convex sides, tapering only in the 

 apical half, but rapidly; the apex three-fourths the length of the base; a dis- 

 tinct posterior lobe not one-fourth the length of the anterior; the front mar- 

 gin transverse or very slightly emarginate, with a distinct triangular ante- 

 rior depression, twice as broad as long, the apex broadly rounded; surface 

 indistinctly punctate. Corium of hemelytra blackish fuscous ; membrane 

 with slight marks of longitudinal infuscation. 



Length, 4.6" im ; breadth of base of thorax, 1.85 mm ; abdomen, 2.25 mm . 



Florissant. Two specimens, Nos. 4644, 11220. 



4. LlTHOCHROMUS E^TRANEUS. 



PL 26, Fig. 6. 



The single specimen is preserved only upon a side view, and is on that 

 account difficult to compare with the others absolutely. The head appears 

 to be of unusual length, being apparently about five-sixths the length of the 

 thorax, and is smooth; the antennas are exceptionally stout and are some- 

 what longer than the head and thorax together ; the first two joints together 

 slightly shorter than the last two ; the first and second joints increase very 

 slightly in size next the apex, and are truncate at tip ; the last joint scarcely 

 enlarges toward the tip, which is rounded. Thorax apparently tapering 

 from a little before the base, somewhat tumid, and punctate; corium of 

 hemelytra clear, or very slightly obscured, punctate throughout, but more 

 densely along the principal veins ; membrane clear. 



Length, 5.5 mm ; of corium of hemelytra, 2.75 mm . 



Florissant. One- specimen, No. 13660. 



