FOSSIL COLEOPTERA 



19 



The Chrysomelidae seem to have been rather rare at Florissant 

 and this is the first Cryptocephalus to be recorded from these 

 shales. Of course the generic reference is to be understood in 

 the broad sense of the term, since there is no way of separating 

 most fossils by the characters used in defining modern genera 

 split off from Cryptocephalus as understood by its author. The 

 prominence of the head, judging from the appearance of the 

 under surface, is due to flattening and pressure. Cryptocephalid 

 characters are seen in the form, texture, and sculpture of the 

 body, the small rounded anterior coxse well separated by the 

 prosternum, the widely distant hind cox£e, the short intermediate 

 abdominal segments with arcuate sutures, and the filiform an- 

 tenna, 



Bruchus Linn. 



B. succiNTUS n. sp. (Plate V, Fig. 6.) Preserved in side view. Form 

 rather stout. Head finely but distinctly and closely punctate, more finely 

 on the occiput, antennae wanting, except three or four of the median joints 

 which are hardly serrate. Prothorax with close, deep, rounded punctures 

 of moderate size, becoming subconfluent in places, these punctures very 

 much larger than those of the head. Elytra badly broken at apex, epi- 

 pleural lobe strong, disk punctured and striate, the striae narrow, moderately 

 deep, much stronger at base, marked at their bottoms with single rows of 

 close, slightly elongate punctures, interspaces distinctly punctate. Hind 

 coxal region strongly and closely but not coarsely punctured, the sternal 

 plates very sparsely, the abdomen scarcely visibly punctulate. Hind femur 

 only moderately swollen and not showing teeth, the tibia nearly straight. 

 Length, from front of head to tip of abdomen, 3.50 mm. 



Easily distinguished from any of the other described Floris- 

 sant species by the small size, strong punctuation, and compara- 

 tively slender hind femora. The above measurement is that of 

 the type, other specimens run as small as 2.25 mm. 



B. wiLSONi n. sp. (Plate V, Figs. 7, 8, 9.) Form rather short and 

 stout. Head small, eye large, front moderately strongly, closely punctured, 

 antenna} slender, about as long as the elytra, not serrate. Prothorax in- 

 jured, but what remains shows it to have been broad, the sides apparently 

 nearly straight to near the apex, thence very suddenly narrowed. Disk 

 with moderately deep, rounded punctures, not very closely nor regularly 

 placed, the median area being less punctured than the lateral, base hardly 

 lobed, nearly straight or only a little curved. Elytra rather more than 

 three times the prothoracic length, nearly smooth excepting that each is 

 marked with fine, narrow, regular, impunctate striae. Abdomen, as pre- 



