OF PHILADELPHIA. 183 



intermediate tooth eniarginate : feet dilated, compressed ; ante- 

 rior thighs angulated in the middle beneath, and with a project- 

 ing lobe near the inferior tip ; anterior tibia with five elevated, 

 dusky, transverse, obliquely arquated lines on the exterior side, 

 of which the fifth is nearly terminal and distant from the others : 

 tarsi elongated ; basal joint very long, penultimate one very 

 short. 



Length one-fifth of an inch. 



Ilesembles Scolytus Jlavicoriu's of Olivier, but is readily 

 distinguishable by the form of the terminal spine of the 

 elytra. [325] 



COLYDIUM Fabr. Latr. 



C. BIPUNCTATUM. — Blackish-brown ; anterior tibia angulated 

 before j intermediate ones five or six spined. 



Inhabits Upper Missouri. 



Body elongated, linear, punctured; punctures minute, regular, 

 distant : antennae piceous : thorax longitudinally oblong, sub- 

 quadrate angles rounded : lateral edges slightly arquated : scutel 

 obtusely triangular : elytra with punctured strise; an obsolete, 

 subsutural, piceous spot on each before the tip : anal segment 

 naked : feet piceous ; anterior tibia with a slightly projecting 

 angle on the anterior middle ; intermediate tibia five or six 

 spined on the anterior edge ; posterior ones mutic. 



Length one-ninth of an inch. 



The spots on the elytra are hardly perceptible, excepting in a 

 particular light, and are even then obsolete. 



[Belongs to Ips. — Lec] 



LATRIDIUS Herbst. 



L. 8-DENTATUS. — Dark reddish-brown ; thorax dentate each 

 side, and with an indented spot behind the middle. 



Body dark reddish-brown : eyes black : thorax suborbicular, 

 seven or eight-toothed each side ; a profoundly indented, large 

 spot on the basal submargin : [325] elytra with approximate 

 series of punctures : feet yellowish-piceous at base. 



Length nearly three-fortieths of an inch. 



Caught above the confluence of the Platte with the Missouri 

 river. 



[A species of Corticaria. — Lec] 

 18:i4.] 



