470 TERTIARY INSECTS OF NORTH AMERICA. 



DRYOC.ETES Eichhorn. 

 DRYOC.ETES IMPRESSUS. 

 PI. 8, Fig. 28. 



Tnjpodendron impreniin Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., II, 83 (1876). 

 Dryoccftvs impreisus Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., IV, 767-7G-4 (1875'). 



This species has the prothorax punctured as distinctly as the elytra, 

 and the punctures on the elytra show but a slight tendency to a longitudi- 

 nal arrangement. The punctures of the prothorax are longitudinally obo- 

 vate, a very little more frequent than on the elytra, equally distributed 

 throughout; on the elytra they are also equally distributed, but circular, 

 about 0.04 mm in diameter, and average 0.1 miu in distance apart; they have- 

 but an obscure longitudinal arrangement into nineteen or twenty rows, 

 and the successive punctures of each row are at about the same average 

 distance apart as those of two contiguous rows. The species is of about 

 the size of D. septentrionalis (Mann.), but has more of the markings of I> 

 affaber (Mann.), although the punctuation of the elytra is not so distinctly 

 separable into longitudinal series. 



Length of prothorax, 1.28 mm ; height of same, 1.44""" ; length of elytra, 

 2.8 mm ; breadth of same, 1.24 mi ". 



Green River, Wyoming. Four specimens, Nos. 1;V218 (F. C. A.Rich- 

 ardson), 4009, 4048, 4091 (Bowditch and Scudder). 



DRYOC^ETES CARBONARIUS. 



PI. 8, Fig. 6. 

 Dryoccetes carbonarius Soiuld., Bull. I' S. Ueol. Geogr. Snrv. Terr., IV, 768 (1878). 



Another species, not very closely allied to the last, is represented by 

 a single, rather mutilated specimen, which is pitchy-black, and consists of 

 part of the head, thorax, and elytra, The head is rather long, faintly and 

 not very closely punctured, the eye moderately large and circular. The 

 thorax is proportionally longer than in the preceding species; the front 

 margin recedes a little on the sides, and the surface is subrugose by sub- 

 confluent punctures, the walls of which form wavy ridges having a longi- 

 tudinal direction. The elytra are broken at the tip ; their outer anterior 

 angle is obliquely excised, and the outer margin behind it straight, not sin- 

 uate, as in the preceding species; the surface is rather coarsely, but very 



