(A RABID JK. 15 



CAKABUS JEFFERSOXI sp. nov 

 1'i. I, tig-s. C>, lo. 



Two entirely different specimens are referred here to a single species, 

 one of them showing- the head with the appendages, the other a nearly 

 perfect elytron. Both are of about the size of an ordinary Carabus, and 

 though neither agrees well with that, genus in certain particulars, there 

 seems to be no other with which they agree so well. The head is smooth, 

 slightly tapering forward, just as broad behind the eyes as the length to the 

 tij) of the emarginate labrum; well pronounced, straight, slightly convergent, 

 supraorbital ridges run backward from the outer base of the clypeus. 

 Lal>rum deeply and roundly emarginate. Mandibles stout. Maxillary palpi 

 extraordinarily stout for a Carabus, the joints being subequal, full and large, 

 not more than twice as long as broad, together not nearly so long as the 

 breadth of the head. Labial palpi entirely similar and correspondingly 

 smaller. Antenna- 11-jointed, the second joint a little less than half as 

 long as the third, the latter apparently cylindrical, the whole antenna rather 

 short, being only about a little more than twice as long as the head, while 

 it is usually three times as long as the head. 



The elytron, which is of just the proper size to match the head, but 

 which, being on a different stone, may of course belong to a distinct species, 

 is placed here because it, too, differs in a similar way from Carabus. It is 

 not perfect, the base being broken, but it is nearly complete, its original 

 shape somewhat distorted by flattening, and shows the under surface. Ten 

 punctate striae are seen, of which the rive on the sutural side are much 

 less crowded than those next the outer margin. Near the middle of the 

 elytron, on the fifth stria, can be very obscurely seen a pair of fovese of 

 large size, about as broad as the interspaces, and separated from each other 

 by more than double that distance. The puneta. seen as slight elevations 

 in the specimen, are much coarser on the crowded than on the more distant 

 stria:-. 



Length of head, including mandibles, 5 mm.; of antennae, 8.25 mm.; 

 breadth of head behind eyes, 3.65 mm.; length of maxillary palpi, 2.65 mm.; 

 breadth of basal joint at apex, 0.5 mm.; length of fragment of elytron, 11 

 mm.; breadth of elytron, 5 mm. 



Florissant, Colorado; two specimens, Nos. 4264, 14139. 



