FOSSIL COLEOPTERA ot) 



Easily distinguished from all of the other knoAvn Florissant 

 Bruchida', except Bruchus dormescens, by the form, and from 

 that species by having simple antenna^, those of B. dormcscois 

 being strongly pectinate. In punctuation, it is different from 

 any of the others. The specimen is in reverse, so that the punc- 

 tures and strijB above described appear as granules and ridges. 



Named for Dr. Samuel Henshaw of Cambridge, Massachusetts. 



B. EXHUMATUS n. sp. (Plate VII, Figs. 2, 10.) Preserved as a reverse, 

 in dorsal view, lacking the legs, front of the head and antennte, but in 

 good condition as concerns the elytral sculpture and structure. Eyes large,, 

 separated by less than their own width, emarginate anteriorly, the space 

 between them apparently finely alutaceous but without well defined punc- 

 tuation. Prothorax short, broader behind, the more perfect side about 

 straight near the hind angle but broadly and regularly arcuate anteriorly, 

 front margin slightly projecting at middle, hind margin with fairly well 

 defined lobe, which, however, is split in the center so as to obscure the exact 

 shape, the entire thoracic surface alutaceous like the head and in addition 

 with low scattered granulations which represent shallow punctures. Elytra, 

 subparallel but broadest near the humeri, broadly separately rounded at 

 apices, each with ten fine sharp subequidistant carina^ (representing stria^, 

 these carina3 somewhat catenate as if the striae had been marked with 

 elongate but not very well defined punctures. The fourth and fifth striae 

 are shorter than the others, much as in the recent B. discoideus, which, 

 however, was not resembled in form nor in general sculptural characters. 

 Interspaces flat and finely alutaceous. Tip of abdomen wanting, probably 

 owing to an imperfection in the stone. Length, from front of eyes to tip 

 of elytra, 4.35 mm.; of prothorax, 1.10 mm.; of elytron, 2.90 mm. Width 

 of prothorax, 1.50 mm.; of one elytron, behind humerus, 1.30 mm. 



Florissant, Colorado, March, 1911, collected by Professor Cockerell. The 

 type and only known specimen is in the Museum of the University of 

 Colorado. 



Aside from the characters given in the foregoing diagnosis, it 

 may be noted that a pronotal carina on the fossil indicates that 

 this part was marked with a distinct median groove in the living 

 insect. The scutellum is not defined. In form, B. exhumatus 

 probably approached the recent B. protract us Horn, from the 

 southwestern states. It was a considerably smaller insect than 

 Scudder's Spermophagus vivificatus from the Florissant shales,, 

 and if his figure is correct the elytra are differently striate. A 

 specimen in the collection of the United States National Museum 

 shows the antenna? nicely, and indicates that these organs were 

 weakly serrate as in most of the recent North American species. 

 This has furnished the basis for the figure given. 



