368 Watter N. Hess 
of dying and dead pine trees. He records the presence of larvae on 
July 14, pupae in October, and adults on April 8, May 5 and 9, October 17, 
and December 19. ; 
Felt (1906) thinks these insects should not be considered injurious to 
living trees, as they live in rotten wood. ‘Their operations, together with 
those of associated insects, soon loosen the bark so that it falls off in large 
sheets. Felt found the grubs transforming to adults during the latter 
part of the summer, in specially constructed pupal cells underneath the 
bark. 
SYNONYMY 
The ribbed pine-borer belongs to the order Coleoptera, family Cerambyc- 
idae, subfamily Cerambycinae, genus Rhagium, species lineatum. This 
species was first described by Olivier (1795) as Stenocorus lineatus, but was 
later placed in the genus Rhagium. Several workers, chiefly European, 
consider this insect the American form of the European species znquisiior, 
and hence give it varietal rank under this species as Rhagium inquisitor 
lineatum Oliv. There seems to be good reason for considering this species 
the same as the European inguzsitor; however, since American workers 
list the American form as a distinct species, it 1s so considered in this 
discussion. 
DISTRIBUTION 
The ribbed pine-borer is commonly and widely distributed throughout 
the greater part of North America. It has been reported from twelve 
States in this country, in addition to Chihuahua (Mexico), Vancouver, 
and the Mackenzie River region of Canada. The States from which it 
has been reported are Maine, Massachusetts, New York, Pennsylvania, 
Virginia, North Carolina, Maryland, Louisiana, Michigan, New Mexico, 
Idaho, and Oregon. From these data it seems probable that the beetle 
ranges in distribution from northern Mexico to central Canada, extending 
across the continent from coast to coast wherever pine is found. 
The species inguisttor, with which this species is often grouped, is widely 
distributed in the Old World. It has been reported from Europe, Siberia, 
Syria, and Japan. 
HOSTS 
All of the common species of pine in New York and Pennsylvania are 
attacked by the ribbed pine-borer. The species most commonly found 
