WICKHAM: new MIOCENE COLEOPTERA from FLORISSANT. 455 



Aphodius shoshonis Wickham. 



This is represented by one specimen, No. 2,549 M. C. Z. (No. 7,720 

 S. H. Scudder Coll.). It agrees with my type. 



Aphodius aboriginalis Wickham. 



A fine specimen with counterpart. No. 2,551, 2,552 M. C. Z. (No. 

 13,611 and 13,645 S. H. Scudder Coll.). This corresponds to the 

 type. Several others are too poor for certain determination, or else 

 show only undersides, but belong to either the present species or to 

 A. granarioides. They bear the No. 2,553-2,558 M. C. Z. (No. 

 8,032, 8,335, 8,369, 9,164, 10,334, 12,437 S. H. Scudder Coll.). 



Aphodius mediaevus, sp. nov. 

 Plate 6, fig. 5-7. 



Form very short and stout for this genus, as much so as in the recent 

 A. hamatus. Head poorly preserved, not showing the shape nor the 

 sculpture sufficiently well for certain description but the clypeus ap- 

 pears to have been subtruncate anteriorly and there is no visible cepha- 

 lic punctuation. Prothorax very broad, about twdce as wide as long, 

 sides arcuate, surface indistinctly and not coarsely punctured. Scutel- 

 lum short. Elytra rather finely and very distinctly striate, the striae 

 with well-marked punctures which are smaller and circular in the basal 

 region, becoming larger and slightly transverse on the disk as indi- 

 cated by the figure. Legs stout but not well preserved excepting one 

 belonging to the front pair which shows the sharp and strong tibial 

 teeth very nicely. Length, as preserved, 4.15 mm. 



Described from a single specimen with counterpart. 



Tyye.— No. 2,539, 2,540 M. C. Z. Florissant, Col. (No. 4,901 

 and 5,395 S. H. Scudder Coll.). 



A very easily recognized species, at once differentiated from any of 

 the other Florissant forms by the moderate size, the broad outline, 

 the indistinct thoracic punctuation and the well-marked punctures 

 of the simple elytral striae. 



