large, almost as high as the prothorax and about two-thirds as long, vertex 

 sloping into the front with a gentle curve. Cephalic punctuation minute 

 but distinct and pretty regular, genae vertically finely rugose. Antennae 

 obscured. Eye not fully definable. Prothorax subcuneate in side view, 

 back scarcely arched, surface finely granulate on the disk, becoming closely, 

 moderately coarsely and rather deeply punctate on the lower portions of 

 the sides where the punctures tend to form vertical rows. There are no 

 thoracic asperities. Elytra rather badly broken on the outer edge and 

 probably with the sutural margin also wanting, but what remains shows 

 the sculpture very well. This consists of moderately deep wide striae, 

 coarsely but not very deeply punctate, the punctures nearly approximate. 

 Interspaces broad, nearly flat, finely roughened. Metasternal area and 

 base of abdomen closely and not deeply punctured, these punctures some- 

 what smaller and much less distinct than on the prothoracic flank. Legs 

 short, stout. Length, 2.85 mm. 

 Described from one specimen. 



A well preserved little insect which separates at once from 

 all Florissant fossils of somewhat similar form and size by the 

 combination of large head, short prothorax and strong sculpture. 



PHLOEOTEIBUS ZIMMEEMANNI sp. nov. 

 (Plate III, fig. 16). 



Form elongate, nearly parallel. Head wanting except a small portion in 

 poor condition. Prothorax strongly rounded anteriorly, subparallel behind, 

 base almost rectilinear, surface roughly and rather irregularly punctured, 

 the anterior edges of the punctures toward the front and sides strongly 

 raised so as to form distinct asperities. Elytra imperfect as to outline, basal 

 margin raised and serrate, each with seven rows of deep circular punctures 

 which are pretty closely approximated longitudinally and wider than the 

 rather shallow striae. Interspaces not quite equal in width, but broader than 

 the diameter of the punctures, asperate like the prothorax though not quite 

 so strongly, the asperities becoming lower and more transverse as they ap- 

 proach the elytral apex. Length, as preserved, 3.00 mm. 



Described from one specimen. 



In those characters which can be determined this insect ap- 

 proaches ver}^ closely to the recent genera PJiloeotrihus, Phloeo- 

 sinus and Polygraphus, but I have finally decided to refer it 

 to the first of these on account of its general similarit}^ in sculp- 

 ture to the modern Phloeotrihus frontalis, found in the eastern 

 half of the United States. The outer elytral edge is almost cer- 

 tainly broken off, so that I am unable to say whether or not it is 

 serrate. 



The name is given in memory of Christoph Zimmermann, an 

 early and industrious student of American Scolytidae. 



19 



