AMERICAN COLEOPTERA. 163 



3. T. plastographus. — Also of the same form and sculpture as T. callvjraphus; 

 the middle part of the disc of the prothorax behind is less punctured, with a 

 narrow smooth space; the strise of the elytra are composed of transverse punc- 

 tures, and the intervals as far as the 5th are nearly free from punctures; the 

 eubsutural interval is, however, somewhat rugose towards the declivity, as in 

 that species ; the declivity is less deeply excavated, and armed each side with 

 but four teeth, the anterior one being very small, the 2d and 3d large, some- 

 what connected together, and the. 4th moderate in size, the posterior elevated 

 margin is as long as in T. jiini, extending one-third the circumference of the 

 excavation. Long. 4—5 mm. 



California, one specimen. This species so resembles in the arma- 

 ture of the posterior excavation of the elytra T. phii, that I con- 

 founded it with that species. On close comparison, however, the dif- 

 ferences are quite apparent, consistins; not only in the transverse and 

 coarser punctures of the elytral stria?, but in the sutures of the antennal 

 club, which are strongly angulated at the middle, and again in a back- 

 ward direction near the inner side. 



B. — Antennal club with the first suture nearly straight, 2d bisinu- 

 ate ; posterior margin of the declivity of the elytra much longer. 



4. T. pini. =-Bos<«cAms pini Say; Tomicus prcefi-ictus Eichhoff, Berl. Ent. 

 Zeitschr. 1867, 401. (Ante, p. 147.) 



Atlantic States, Canada, Oregon. In this species the punctures of 

 the rows of the elytra are not transverse, and the intervals are nearly 

 free from punctures; the posterior declivity is deeply excavated, 

 acutely margined below for rather more than one-third of its circum- 

 ference, and armed each side with four teeth, of which the 1st is small, 

 the od usually longer than the 2d, but more or less connected with 

 it, the -Ith shorter than the 3d, and acute. The thorax is deeply, but 

 rather finely punctured behind towards the middle, with a narrow, ill 

 defined, smooth dorsal space. Long. 4 mm. 



A larger and somewhat stouter form occurs in the Hudson Bay 

 Territory, but I am not disposed to view it as indicating a different 

 species. Four specimens are in my collection, and I have seen several 

 others; they are about 5.5 mm. long., and are more hairy than the 

 ordinary form. 



A smaller specimen from Hudson Bay Territory diff'ers from T. in- 

 ferrujjfus by the head being shorter and more coarsely punctured, just 

 as in T. pini. but the intervals of the elytra have rows of very distant 

 punctures, not so numerous as in T. interruptus, and the striae are 

 composed of more close set punctures, as in T. pini. It is probably 

 a distinct species, but I am unwilling to impose a name upon the single 

 specimen before me. 



