388 SCOLYTID./E. 



[LeConte. 



more strongly serrate, and are armed with a strong apical spur ; the tarsi 

 are rather short, and the third joint is more or less dilated, bilobed or 

 emarginate. The ventral sutures are straight and deep ; first and fifth 

 segments longer than the others. The head is exserted and prominent, the 

 heak short and stout, with oblique deep grooves, which unite in the gular 

 space, forming a transverse impression ; the eyes are transverse, not very 

 finely granulated. Antenna? with 7-jointed funicle and oval annulated 

 club, which is not compressed, and has the basal joint large, corneous and 

 shining, very much as in Baris. The scutellum is small, not depressed, 

 and the basal margin of the elytra is not acutely elevated, though quite 

 distinct in //. granulatus and pinifex. 



Three genera are indicated by our species: 



Front coxae contiguous, or nearly so 2. 



" widely separated SCIEBUS. 



Third joint of tarsi emarginate HYLASTES. 



" bilobed HYLUBGOPS. 



HYLASTES Er. 



I have but two species to add to those mentioned in my synopsis, which 

 may be thus tabulated ; all have the third joint of tarsi emarginate, not 

 dilated ; mesosternum truncate, not protuberant ; tibia? with very large 

 teeth ; prosternal ridges acute ; basal margin of elytra not acute. 



Beak carinated 2. 



Beak not carinated ; small, slender, dark brown, elytra 

 coarsely punctured in rows, with rows of short 

 suberect hairs 8. 



2. Glabrous or subglabrous species 3. 



More or less hairy 7. 



3. Elytral interspaces not convex, punctured and less 



rugose ; form more slender, prothorax more 



densely punctured 4. 



Elytral interspaces convex, rough and rugose 6. 



4. Longer and narrower than nigrinus and more finely 



sculptured .on the head and prothorax 5. 



Somewhat less slender, more coarsely sculptured 3. nigrinus. 



5. Prothorax nearly elliptical, more coarsely punctured 1. macer.- 

 Prothorax gradually narrowed in front, less coarsely 



punctured 2. longus. - 



6. Elytra rougher, and muricate behind towards the sides 4. porculus. 

 Rugosities finer, sides of elytra not muricate 5. cavernosus. 



7. Pubescence fine and short ; prothorax equably punc- 



tured 6- gracilis. - 



Hairs long and sparse ; prothorax coarsely punctured, 



with smaller punctures intermixed 7. porosus. - 



8. Interspaces of elytra opaque, rough with small granules 8. tenuis. 

 Interspaces of elytra somewhat shining, rugose 9. exilis. 



