126 WicMam — New Fossil Goleoptera from Florissant. 



Art. XY. — Neiv Fossil Coleoptera from Florissant; by 



H. F. WlCKHAM. 



Calosoma Web. 



C. calvini n. sp. .Represented by a well preserved elytron, 

 measuring 16'30 mm from the humeral angle to the apex of the 

 specimen, the extreme point and a portion of the scutellar 

 region being lost. Greatest width (about apical two thirds) 

 5*90 mm . The sides are approximately parallel, only slightly 

 broadening from the base to that point, the outer margin thence 

 regularly arcuate to the tip. The margin is quite broadly 

 reflexed at the humerus but becomes narrower posteriorly, 

 and fades out about the broadest part of the elytron. Surface 

 with about eighteen striae, well impressed and sub-equidistant, 

 the two exterior somewhat indistinct for about half their 

 length at base and apex. The fifth stria joins the fourteenth 

 at a point about 2 mm from the apex, forming an arc within 

 which all the enclosed striae come to an end, while those out- 

 side continue nearly or quite to the tip. Interstices rather 

 faintly but distinctly convex, divided by fine transverse lines 

 into quadrate spaces which are broader than long ; striae plainly 

 and fairly deeply punctured, the punctures small and distant, 

 distinct to the extreme apex. 



This specimen indicates a species considerably larger than 

 O. emm.onsi Scudder, which was also described from the 

 Florissant shales, and differs as well in having distinctly 

 punctured elytral striae. The general arrangement of the striae 

 near the tip is less like that of the recent G. wilcoxi (with 

 which Scudder compares his G. emmonsi) than of our common 

 G. calidum, but the foveae, which can be made out on the 

 fourth, eighth and twelfth interspaces, were apparently small 

 as in G. wilcoxi. 



The type, described above, is without exact indication of 

 locality, being marked simply Florissant, 1908. It was received 

 from Prof. Cockerell. A second specimen, collected by Mrs. 

 Cockerell at Station 13, is also referred to this species. It 

 consists of an elytron in much less perfect preservation than 

 the type and portions of two legs, one of which, though actually 

 smaller, shows the tarsal joints to h#ve been proportioned 

 almost exactly as in G. scrutator. The elytron is somewhat 

 smaller than the type, measuring about 14 mm , but as far as can 

 be seen is similarly punctured. 



I take pleasure in giving to this fine species the name of 

 my honored instructor and colleague, Dr. Samuel Calvin, as a 

 slight recognition of his worth as a man and a geologist. 



