105 



B The frontal pit of the female circular, undivided. 



C The pronotum with the punctures close and regular in size; the 

 elytra finely rather closely punctured, with very fine pubescence; 

 the frontal pit of the female very large, occupying nearly the 

 whole cephalic half of the front, extending behind the eyes; length, 

 2-3 mm. Vancouver Isl., B.C., and California. 



fossifrons Lee. Page 105. 



CC The pronotum with the punctures sparse and irregular in size; the 

 elytra rather sparsely punctured on the disc; the interstrial hairs 

 coarse and long; the frontal pit of the female covering about the 

 median third, not extending behind the eyes; length about 2 

 mm. Eastern Canada and Eastern United States. 



hopkinsi Sw. Page 106. 



BB The frontal pit of the female longer than wide, divided into two fossae 



by a longitudinal median carina. lecontei Sw. Page 106. 



AA The declivity steep ; the pronotum with the sides subparallel on more than 



the caudal half, broadly rounded in front; the declivity with two teeth 



on each side, representing 2nd and 3rd of the group A, small in the female, 



very large and curved in the male with the upper one elongate, the 



tooth at the end of the second interspace obsolete in the males, nearly 



so in the females. 



B Rather stout species; the frontal cavity of the female very large, 

 extending behind the eyes, not divided, suboval, wider in front; the 

 acute ridge preceding the second declivital tooth of the male strongly 

 developed; the punctures of the pronotum and elytra rather feebly 

 impressed, small and seldom closely placed; the pronotal asperities 

 few and coarse. (PL 15, fig. 4). carinulatus Lee. Page 106. 



BB Rather slender, the frontal cavity or pubescent spot of the female 

 situated upon the cephalic half, and divided by a longitudinal obtuse 

 median carina; the ridge preceding the 2nd declivital tooth of the 

 male feebly developed. 



C The declivital teeth of the male moderately slender; the front of 

 the female with a divided, median, heartshaped cavity in front 

 of the eyes. (PL 15, fig. 2). Western species. 



knechteli n. sp. Page 106. 



CC The declivital teeth of the male very stout; the front of the female 

 with a subtriangular pubescent area. Eastern species. 



plagiatus Lee. Page 107. 



Pityogenes fossifrons Lee.; Am. Phil. Soc. Proc., 15: 353, 1876 (Pityophthorus) ; 

 Schwarz, U.S. Nat. Mus. Proc. 18: 609, 1896 (Pityogenes). 



Length, 2-3 mm.; black, with the declivity red. The front of the 

 female is granulate about the sides, with the excavation very large and 

 deep, occupying nearly the whole cephalic half; the pronotum is shaped 

 as in hopkinsi Sw., much narrowed in front, coarsely, moderately closely 

 and regularly punctured behind, more closely than in hopkinsi, with a 

 narrow median carina; the elytral punctures are in approximate rows, the 

 strial punctures fine and rather close, the interspaces rather more closely 

 and finely granulate-punctate, the pubescence behind short and fine; the 

 declivity with a row of three small teeth on each side, sulcate along the suture. 



The type, a female, was described from British Columbia; apparently 

 very rare. The only others I have seen are eight females, probably belonging 

 to this species, sent by Ralph Hopping, Pinus monticola, Grassy Lake, 

 Lassen Co., California; and a female and a male, sent by H. C. Fall, 

 Sabrina Lake, Inyo Co., California. 



