122 



Host trees. Eastern Spruces and Pines, Eastern Larch. 

 Distribution. Eastern Canada and Eastern United States. 

 Usually an important secondary enemy, working in the thicker 

 bark at the base of the trunk. 



Orthotomicus decretus Eichh., Berl. Ent. Zeit., 402, 1867 (Tomicus), is stated 

 by Eichhoff to be distinct from caelatus. It is apparently not represented in 

 our collections. Eichhoff says, Rat. Tom., 272, 1878: 



" Leconte has united this insect (Syn. Scol. p. 177) with T. caelatus. The 

 tubercles of the posterior declivity, however, are arranged in one straight line, 

 so that, looking from above and in front, they are seen to be placed on the 

 continuation of the first interspace, and not on the second interspace as in 

 caelatus. The depth of the excavation in the female is, just as in the other 

 species, subplanate, the second and third teeth not near the circumference but 

 situated nearly midway between the margin and the suture." 



Orthotomicus vicinus Lee.; Am. Ent. Soc. Trans., 5: 72, 1874 (Xyleborus). 



Under this name there are four specimens in the Leconte collection 

 labelled " 985," " B. Col." The same species is represented in our collection 

 by long series from northern Alberta and Manitoba, and also by one specimen 

 from Colorado. It has been submerged under caelatus Eichh. The prono- 

 tum is rather finely and not very densely, punctured behind; the elytral 

 striae only faintly impressed and less well defined, the elytral punctures 

 usually small, and less numerous than in caelatus,' the interspaces flat; the 

 declivity sparsely finely punctured and shining; the male declivity with the 

 2nd and 3rd teeth usually distinctly farther from the margin than in caelatus; 

 the female declivity more strongly convex on the sides, with the 2nd and 

 3rd teeth distinctly nearer the suture than in caelatus, the 2nd tooth closer 

 to the suture than to the margin. 



This species is doubtfully distinct from caelatus Eichh. The great 

 majority of our specimens from the region west of the Great Lakes are 

 distinctly of the vicinus type, while the eastern specimens are almost invari- 

 ably of the true caelatus type. The true caelatus is also represented from 

 Alaska. 



Host trees. Spruce, Larch. 



Distribution. Manitoba to the Rocky mountains in Canada; de- 

 scribed from British Columbia, but not represented from there in our 

 collection; Colorado. 



Orthotomicus punctipennis Lee.; Am. Phil. Soc. Proc., 17: 624, 666, 1878 

 (Xyleborus)', Eichhoff and Schwarz, U.S. Nat. Mus. Proc., 18: 609, 610, 

 1896 (Pityogenes). 



The length, 2 5 mm. ; known to me only from the description and the 

 type. .The front of the head is entirely retracted in the type. The declivity 

 is much as in the female of Pityokteines sparsus (balsameus), but more acutely 

 margined and more densely, coarsely punctured. The antennal club is 

 slightly longer than wide, rather thick at the base, and truncate distally 

 as in caelatus Eichh. 



Orthotomicus ornatus Sw. Can. Ent. 48: 185, 1916. 



The length, 2-3 mm., decidedly slender; allied to the typical Ortho- 

 tomicus in the normal front of the female, and in the fairly distinct and 

 complete apical margin of the declivity, but rather closely to the typical 

 Pityokteines in the small size, the long second abdominal sternite and the 

 characters of the antennal club. 



Host trees. Western Yellow Pine, Jeffrey's Pine. 



Distribution. Williams, Arizona; Whitman, Oregon; Tulare county, 

 California; possibly extending northward into British Columbia. 



