AMERICAN COLEOPTERA. 135 



After describing a new genus Ijisimorjyha, founded on a Mexican species 

 {striatopunctata)^ lie adds a paragraph which I here translate : 



" I should have considered this species, Rhizophagus {Ips) cylindricus, Lee, did 

 not the diagnosis read as follows; ' thorace paulo angustiore, latitudine fere sesqici 

 longiore, lateribus rectis, angulis posticis rotundatis.' The striate punctate elytra 

 lead me to suppose that this species should also be referred to Ipsimorpha." 



The Rhizophagus cylindricus Lee, and Ips cylindricus Lee, are two 

 very distinct insects and differ especially in the form of the anterior 

 coxas and the number of antennal joints, and belong to two distinct 

 families, It is very likely that Reitter has never seen the description 

 of the latter species. 



PITYOPHAGUS, Schuck. 



Two species occur in our fauna. 



P. cephalotes Lee. Proc. Acad., 1860, p. 377. Color rufous, elytra piceous. 

 Length .20 inch; 5 ram. 



Occurs in Pennsylvania. 



P. rufipennis Horn, Trans. Am. Ent. Soc, 1872, p. 146. Body black, legs 

 piceous, elytra brownish red. Length .28 inch; 7 mm. 

 Occurs in Oregon and Vancouver. 



All the specimens before me have the tip of the pygidium furnished 

 with a reflexed margin. This may be sexual. 



Carpophilus rufus Murr. From my series I am convinced that this 

 species is melanopterus Er. 



DERMESTID^. 

 PERIMEGATOMA, n. g. 



This genus is suggested for several species occurring from Lake 

 Superior to Texas, California and Sitka, which agree with Megatoma 

 in all of its characters except in the antennal fossae. In the present 

 genus there are no antennal fossae whatever. The ornamentation, by 

 pubescence of the surface, resembles somewhat that of Megatoma, 

 there being two transverae undulating cinereous bands, the one at 

 basal third the other at apical fourth. 



The following table will enable our species to be readily distin- 

 guished : 



Antennal club three-jointed. 



First joint of club, in both sexes, very little smaller than the second joint. 



Pubescence uncolored, greyish-white, (.16 inch) cyliudriciim* 



Pubescence bi-colored, (.20 inch) variegatum. 



First joint of club extremely short. 



Pubescence bi-colored, (.14 inch) falsiini. 



Antennal club five-jointed. 



Pubescence bi-colored , Bclfragrei. 



