170 



THE CANADUN ENTOMOLOGIST, 



b. Third joint of antennai much longer than tlie fourth. 



Larger species, legs bicoloured. .76-1.00 in . . Schaumii, Leo. 

 Smaller species, legs unicolored. .40-. 60 \n . .vestiius, Hald. 

 bb. Third joint of antennte but slightly longer than the fourth. 

 Tips of elytra obliquely truncate, sub-bidentate. .87-.90 



in. cylindricollis. Say. 



The name trivittatus replaces that of vittiger in accordance with 

 the synonymy proposed by Mr. Leng. 



Rhagium, Fabr. 

 R. lineatum, Oliv., is often common under pine bark or in lumber 

 piles. It has scarcely the appearance of being a Longhorn at all, the 

 antennae being so short as to usually fail of attaining the base of the 

 elytra. The prolhorax is much narrower than the elytra, armed on each 

 side with a strong spine or acute tubercle. The elytra are narrowed behind, 

 sharply costate. In colour the insect is black or nearly so, the prothorax 

 appearing gray from the pubescence which clothes it, excepting a smooth 

 stripe on each side (including the spine) and one on the median line. The 

 elytra are marked by a few reddish or yellowish spots, and the pubescence 

 is irregular, giving a mottled appearance. Length, .54-.80 inch. My 

 small specimens are from the Lake Superior region, while the large ones 

 came from the forests of the mountains of Arizona. 



Centrodera, Lee. 



A large species, decoloraia, Harr. (Fig. 26), is our 

 only representative. The head, prothorax, under sur- 

 face and appendages are reddish-brown, the elytra 

 lighter. The eyes are more prominent than usual, the 

 prothorax shining, nearly smooth at middle, closely 

 punctate and somewhat opaque at sides, lateral tubercle 

 large and acute. Elytral punctuation coarse at base, 

 becoming finer to tip, sides nearly parallel. Mr. Leng 

 describes the antennae as " about as long as the body," 

 but they may fall one-third or more shorter. Length, 

 1.20 to 1.25 inch. Rather rare. Found on beech by Mr. Harrington. 



Pachvta, Serv. 



A. Elytra reticulate with raised smooth lines, the intermediate spaces 

 coarsely punctured. Black, subsneous, antennae, femora and base 



.51-.64 in rugipefinis, Nevvm. 



of tibipp ferruginous. 



