103 



Pityophthorus serratus, n. sp. 



A small, slender, strongly punctured species, strongly sulcate and 

 serrate on the declivity, with the secondary sexual characters of the nitidulus 

 group. A male; length, 2-2 mm.; colour, reddish-brown. 



The front is closely, deeply, not coarsely punctured, broadly impressed 

 on the epistoma, with the usual postepistomal, transverse carina. The 

 pronotum is as wide as long, the sides straight and parallel on rather more 

 than the caudal half, then constricted, broadly rounded and moderately 

 serrate on the front margin; the asperities of the cephalic half coarse, acute, 

 rather sparse and irregular; the punctures of the caudal half moderate, but 

 deep and rather close, the median smooth line obsolete towards the summit. 

 The elytra with the sides straight and parallel far beyond the middle, very 

 strongly narrowed on the declivity, with the caudal margin prolonged, 

 subacuminate; the strial punctures rather large and close, very deep, 

 roughening the interspaces, which are similarly punctured, striae only 

 moderately regular near the suture; the declivity very deeply, widely 

 sulcate, the sulci smooth, widened behind, the suture moderately wide and 

 elevated, feebly granulate above, the lateral convexities acute and strongly, 

 closely serrate on the 3rd interspace, with a row of rather short, stiff setae 

 accompanying the row of serrations; the pubescence rather long on the 

 sides behind. 



The female has the front plano-concave, minutely, densely punctured 

 and fringed with very long, incurved, yellow hairs; with the row of setae 

 on the 3rd interspace of the declivity long and conspicuous in our single 

 specimen. 



Type. — A male, Barkhouse Creek, Siskiyou county, California; yellow 

 pine limb; 2933; collector, Ralph Hopping; one paratype, female, same labels. 

 Type No. 108. 



Pityophthorus puUus Zimm.; Am. Ent. Soc. Trans., 2: 143 (Crypturgus). 



This species occurs throughout the Eastern States, north into Michigan, 

 in bark of pines. I have never taken it in Canada. 



Pityophthorus confertus Sw.; Dom. Ent. Br., Dept., Agric, Bull. 14: 27, 1917. 



Length, 2 mm.; width, 0-6 mm. The female with the front sub- 

 circularly plano-concave, closely, very finely punctured, closely pubescent 

 with rather long yellow hairs, longer about the margin, with a faint median 

 line; the male with the front flattened, semicircularly margined by a sub- 

 triangular callus behind, closely, deeply, not coarsely punctured, pubescence 

 short and subequal in length. 



Host tree. — Lodgepole Pine. 



Distribution. — Adam's lake, British Columbia. 



Pityophthorus bisulcatus Eichh.; Berl. Ent. Zeit., 274, 1868. 



It has not been possible for me to connect this name, with satisfaction, 

 with any species represented in our collection. The densely hairy front in 

 one sex, the evenly arcuate sides of the pronotum, and the granulate and 

 setose declivity separate it from nudus, and the two former characters 

 would distinguish it from granulatus. It is entirely too small for pullus 

 and the brief description does not apply very closely. 



Pityophthorus granulatus Sw.; Dom. Ent. Br., Dept. Agric, Bull. 14: 28, 

 1917. 



Very closely allied to nudus, differing chiefly in the more coarsely 

 punctured pronotum and the strongly granulate-setose declivity. 

 Host ,trees. — Jack Pine, White Pine, Balsam Fir. 

 Distribution. — Manitoba, Quebec, and Nova Scotia. 



