104 



Pityophthorus nudus Sw.; Dom. Ent. Br., Dept. Agric, Bull. 14: 30, 1917. 



Length, 1-6 mm.; width, -58 mm., nearly glabrous; the female with 

 the front closely, finely punctured in front of a slight transverse ridge, and 

 clothed with fine short pubescence; the male front closely, rather coarsely 

 and roughly punctured, with a median carina ending in an epistomal granule, 

 the pubescence fine and inconspicuous. 



Host tree. — White Spruce. 



Distribution. — Quebec, Ontario, New York State. 



Pityophthorus deletus Lee. is unknown from our territory; it should be 

 separated from Pityophthorus. 



Pityophthorus comatus Lee. is unknown from Canada, and is apparently 

 extremely rare in collections. It is distinguished from all other species known 

 to me by the subcircular patch of yellow pubescence on each side of the pronotum 

 before the middle. 



Pityophthorus concentralis Eichh. was described from Cuba and is reported 

 in literature from Florida in Rhus metropium. We have a short series from 

 Biscayne and How Ck., Florida, that seem to be Eichhoff's species. They 

 agree closely with his description in Rat. Tomic, except that the pronotum 

 is rather too coarsely punctured behind. P. lateralis has the pronotum rather 

 more finely punctured, but differs from the concentralis description in the punctur- 

 ed (sparsely) elytral interspaces. 



Pityophthorus lautus Eichh. is apparently allied to concentralis and rhois. 

 It has the declivity deeply sulcate on each side with the suture strongly ele- 

 vated, and is apparently distinguished from rhois chiefly by that character. 

 In rhois the suture is only slightly elevated on the declivity, and the elytra con- 

 jointly sulcate, although not so deeply as in concentralis and lateralis; otherwise 

 rhois agrees with Eichhoff's description of lautus very closely. Dr. Hopkins 

 has recognized lautus from W. Virginia in Pinus. 



Pityophthorus consimilis Lee. was described from Michigan but we have 

 not yet taken it to Canada. It is allied to granulatus; but has the pronotum 

 strongly rounded on the sides behind, the discal interspaces of the elytra very 

 sparsely punctured and the female front very densely spongy-pubescent. 



Pityophthorus annectens Lee. was described from Tampa, Florida, and 

 probabhT- does not occur in our territory. The front is densely clothed with 

 long hair in the female; the declivity is acuminate, feebly granulate and feebly 

 pubescent, the elytral interspaces impunctate, the pronotum feebly constricted 

 and feebly rounded on the sides behind. 



Pityophthorus obliquus and P. seriatus were described from Florida, and 

 apparently do not occur in our territory. 



The Genus Pityogenes Bedel. 



Bedel, Faun. Col. Seine, 6: 397, 401, 1888. 



Key to the Species. 



A The declivity oblique; the pronotum strongly narrowed on more than the 

 cephalic half, and narrowly rounded in front; the declivity of both sexes 

 with three small teeth on each side, considerably larger in the males 

 (PI. 15, figs. 1, 3). 



PLATE 24. 



BARK-BEETLE TUNNELS (Original). 



Fig. 1, Eccoptogaster unispinosus Lee; in Douglas fir; nearly one-half natural size. 



Fig. 2, Pityophthorus intextus Sw.; in white spruce; two-thirds natural size. 



Fig. 3, Leperisinus calif ornicus Sw.; in olive; two-thirds natural size. Author's illustration. 



Fig. 4, Carphoborus carri Sw.; in white spruce; three-fourths natural size. 



Fig. 5, Pseudohylesinus grandis Sw.; in Douglas fir; one fourth natural size. 



