94 



C The elytral pubescence close, short and very stout, the longer hairs 

 of the median row on the declivity numerous and little longer 

 than the remaining pubescence; the declivity distinctly im- 

 pressed on each side the suture. Eastern species. 



pruinosus Eichh. Page 94. 



CC The elytral pubescence sparse, the longer hairs of the declivity 

 slender, abundant; the declivity indistinctly broadly impressed 

 on each side the suture, and sparsely granulate. Western 

 States. pilosulus Lee. 



Pseudopityophthorus minutissimus Zimm.; Am. Ent. Soc. Trans., 2: 143, 

 1868 (Crypturgus) : pusillus Harris; Nat. Hist. Soc. Hartford Trans., 82, 

 1837 (Tomicus). 



A common species in dying and dead branches and limbs. 



Host Trees. Oak and Beech in Canada; also in Hazel, and recorded 

 from Dogwood in Eastern United States. 



Distribution. Eastern Canada and Eastern United States. 



Pseudopityophthorus pruinosus Eichh.; Stet. Ent. Zeit., 39: 390, 1878; 

 querciperda Sz.; Ent. Soc. Wash. Proc., 1: 56, 1888. 



This species is destructive to oaks in the Eastern United States, but 

 has not yet been recorded from Canada. 



P. tomentosus Eichh. is unknown to me. It was distinguished from 

 (pusillus) minutissimus, by Eichhoff, through its shorter form, thorax 

 subdilated behind, and the elytral apex obliquely declivous and subretuse; 

 "America borealis." 



The Genus Pityophthorus Eichhoff. 



Eichhoff., Berl. Ent. Zeit., 8: 39, 45, 46, 1864. 



Key to the Species. 



A The antennal club short oval, widest near the middle, only one-fifth longer 

 than wide, with segments 1 and 2 together much shorter than 3 and 4 

 together; the sides of the club crenulate only at the base; the sutures 

 1 and 2 feebly arcuate, 3 very strongly arcuate (PL 1, fig. 4). 



B The sutures of the club not septate, the margins feebly crenulate, the 

 punctures of the elytral striae 2 distinct on the declivity, in a straight 

 line, interspace 2 not widened; the apex of declivity very broadly 

 rounded, subtruncate. ramiperda Sw. Page 98. 



BB The first two sutures of the club feebly septate; the punctures of striae 

 2 very feebly developed and divergent on the declivity, so that inter- 

 space 2 is somewhat widened behind; the apex of the declivity rather 

 narrowly rounded. (PL 1, figs. 4, 5. 6). nitidus Sw. Page 98. 



A A The antennal club with the segments 1 and 2 at least nearly as long as 3 

 and 4; the sides of the club coarsely crenulate on more than the basal 

 half; the segments subequal in length and the sutures often similarly 

 arcuate (PL 10, fig. 22). 



B Elytral declivity with striae 1 and 2 punctured, interspace 2 not widened 

 behind (PL 16, fig. 7). 



C The declivity moderately or strongly sulcate along the suture, with 

 interspace 2 impunctate, the strial punctures normally developed. 



