824 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
The eyes are moderately finely granulated and completely divided. 
The head is large, exserted, and in the <$ is deeply concave. The pro- 
thorax is broader than long, and strongly asperate in front in the 9 , less 
in the <J . The tibia' are dilated, linely serrate on the outer edge, rounded 
at tip, and very feebly mucronate at the inner angle ; the tarsi have the 
joints 1-3 rather stout, nearly equal in length ; fourth very small, fifth 
slender, as long as the second and third united, with simple divergent 
claws. The hairs are not serrate or verticillate, as iu Pityopthorus, but 
slender and smooth. 
The four species iu our fauna are easily recognized : 
Elytra with well defined stria* of punctures, interspaces nearly smooth 2. 
Elytra with ill-detined distant rows of punctures, interspaces equally strongly punc- 
tured, pubescence erect, abundant 4, politus 
Prothorax finely and sparsely punctured at the sides towards the base 1, retusus 
Prothorax finely but less sparsely punctured at the sides towards the base. 2, biviitatus. 
Prothorax scabrous and granulate behind the middle 3, scabricjllis. 
X. bivittalu8 Mannh., Bull. Mosc. 1858,236; Apate biv., Kirby, Faun-Bor. Am. iv, 
192, PI. 8, Fig. 5; Boslrichus cavifrons Mannh., Bull. Mosc. 1843,297 ( $ ) ; ibid, 
1852, 359 ; Xylolerus cav., Mannh., ibid, 1852, 385. 
Maine, Canada, Alaska, Vancouver's Island ; length 3-3.3 mm . 12-13 
inch. Varies greatly in color. Usually the front part of the prothorax, 
the suture and the margin of the elytra are black; sometimes only a 
short, pale stripe is seen on each elytron. (Identified by Dr. Horn.) 
Mr. Schwarz remarks that Eichhoff cites this species as a synonym of 
the European X lineatus Oliv., and adds "I think he is right. His X. 
vittiger described from California, is undoubtedly only a color variety 
of the same species." (Ent. Ainer., n, p. 41.) 
2. The spiny spruce bark-borer. 
Xyleborus calatus Zimmerman. 
Order Coleoptera ; family Scolytid^:. 
(Larva, Plate xxiv; figs. 2, 26; pupa. 3, 3a.) 
As the foregoing species has smoothed unarmed elytra, we have named 
it the "unarmed spruce bark-borer," while the present species, which is 
also destructive to spruce, though abundant in pine trees (p. 175), being 
gouge-shaped at the end of the body with two prominent teeth on side 
we would name u the spiny spruce bark-borer." Its habits and mines 
are apparently like those of the foregoing species, but the mines are 
a little larger, as is the beetle itself. We noticed the beetles in great 
numbers with several pupa 1 under the bark of the spruce at Brunswick, 
August 22, and under another tree, observed August 27, there were 
many pupsB, and numerous pale beetles which had only recently cast oft' 
their pupal skins. There were all stages between very pale beetles and 
the dark, black-brown fully mature beetles; some with a short, broad 
dark stripe on each wing cover : this might be thought at first sight a 
