10 THE CANADIAN ENTOMOLOGIST 



few strikingly distinct species have been reccgnized as ytt unde- 

 scribed. These it is deemed expedient to make known new. 



Quite a few other supposedly new species remain, but the 

 author considers it the part of wisdom to await the acquisition of 

 more extensive series before settling upon the validity of these 

 forms. 



Unless otherwise indicated, the types of the species herewith 

 described were collected by the writer and are to be found in his 

 collection. 



Mordellistena rutiJa, sp. nov. 



Hind tibia with two converging oblique ridges; first joint of 

 hind tarsus with three, and the second with one oblique ridge. 



Ferruginous; nearly linear; head black, with front slightly 

 ferruginous; thorax and elytra ferruginous, the latter slightly 

 darker towards apex; under surface 'ferruginous; anal style very 

 short. Length 4 mm. 



One specimen from Eggers, Illinois, July 7. Collected by 

 A. B. Wolcott, in whose collection the type is placed. 



This species is most nearly allied to Mordellistena tosta, but differs 

 in having the tibial ridges converging, no trace of a third ridge, 

 and the second joint of hind tarsus with only one ridge. It is 

 longer, nearly parallel, and with the head black. 



This should be placed in collections after M. atriceps. 



Mordellistena exilis, sp. nov. 



Hind tibia with two equal parallel ridges; first joint of hind 

 tarsus with four, second with two ridges. 



Black; nearly linear; head, mouth-parts and thorax ferruginous, 

 the last with a black median line reaching to middle; antennae 

 a little darker at apex; front legs and middle femora ferruginous, 

 the middle tibia and tarsi darker; hind femora and apex of tibia 

 and tarsal joints black. Elytra black, with testaceous pubescence. 

 Beneath black, with coarser testaceous pubescence; anal style 

 long and slender. Length 4 mm. 



One specimen from Ft. Sheridan, Illinois, August 7. 



This species has the form and size of Mordellistena marginalis, 

 but is at once distinguished by the tibial ridges. 



This is to follow M. tosta in a systematic arrangement. 



