144 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. Go 



Prosternum narrow, flat or depressed; anterior margin truncate or 

 arcuately emarginate; prosternal process not constricted by the 

 anterior coxal cavities, and obtusely acuminate at apex. Posterior 

 coxae strongly dilated internally ; anterior margin sinuate ; posterior 

 margin oblique. Legs rather slender; anterior and middle femora 

 fusiform, the former more strongly swollen at middle; posterior pair 

 flattened and subcylindrical ; tibiae cylindrical, the anterior pair more 

 flattened, and in the males sometimes armed with a large hook at the 

 apex ; tarsi rather robust; the first joint of posterior pair longer than 

 the second joint. Abdomen with the suture between first and second 

 segments distinct ; last segment rounded at apex in female, truncate 

 or feebly emarginate with two more or less acute teeth in the male. 

 Body elongate-oval, feebly convex, enlarged at base of elytron, and 

 attenuate in front and behind. 



This genus at present includes about 60 described species, and is 

 distributed over the entire North Temperate Zone, with a few species 

 extending their range to near the equator, and are very troublesome 

 to sejDarate because of considerable variation in form, color, size, and 

 sculpture within the species. The apex of the abdomen is more or 

 less truncate in both sexes, sometimes more deeply sinuate in the 

 male, but these secondary sexual characters are very inconstant and 

 misleading, so that they should be used with caiUion in determining 

 the sexes. 



The present paper includes 10 species, two of which are new, which 

 have been recorded or collected in the West Indies. Eight of these 

 species have been described originally from North America, and since 

 the larvae of most of the species live in various species of coniferous 

 trees, they possibly have been introduced into the islands at various 

 times in timber from the United States. 



KEY TO THE SPUCIBS 



1. Pi'osternum broadly sulcate at middle 2. 



Prosternum not or very feebly sulcate at middle 6. 



2. Elytra striato-punctate - 3. 



Elytra costate 5. 



3. Elytral striae distinctly impressed ; elytra aeneous, with a brownish or 



purpureous tinge, and ornated with irregular fulvous spots. 



maculipennis Gory. 

 Elytral striae not distinctly impressed -i 



4. Color above dull cupreous-brown apricans Herbst. 



Color above gi'een ; elytra occasionally with a median indigo-blue vittae. 



and the suture and lateral margins always cupreous decora Fabricins. 



5. Elytral costae flat, punctured ; color above dark coppery-brown. 



striata Fabricius. 



Elytral costae convex, their summits polished and not or very feebly 



punctured ; color above green to ultramarine, the suture and lateral 



margins usually cupreous aurulenta Linnaeus. 



