NORTH AMERICAN COLEOPTERA. 29 



111 form this species resembles a small Fornax orcheddes, but is 

 much more depressed. 



One specimen, Vancouver. 



ADELOTHYREUS Bonv. 



Form elongate, narrower posteriorly ; antennae half the length of the body, 

 second joint very small, third as long as the next two, joints four to ten gradu- 

 ally shorter and more strongly serrate, joint eleven elongate oval ; episterna nar- 

 row at base; propectus with a short juxta-sutural groove, limited externally in 

 front by a feeble carina ; lateral supplementary carinse distinct, the posterior very 

 long, the anterior short and directed arcuately downward ; posterior coxal plates 

 nearly parallel ; tarsi slender, the fourth joint slightly dilated and excavated 

 above, beneath very feebly lobed, the first joint of the posterior tarsi as long as 

 the next three ; claws very slightly broader at base. 



This genus has all the essential characters of Microrhagus, except- 

 ing that the juxta-sutural groove is here merely feebly indicated in 

 front, while in that genus the groove Ls entire and limited externally 

 by a well defined carina. It Is, however, probable that this character 

 may not. long remain valid, as it will be seen that in M. humeralis the 

 outer carina of the groove is obliterated posteriorly, and in that and 

 Bonvouloiri the coxal plates are parallel, while the tarsal structure 

 also more nearly resembles Adelothyreus. 



One species is known in our fauna. 



A. Dejeani Bonv. — Slender, elongate, gradually narrower posteriorly, pice- 

 ous, feebly shining, sparsely clothed with very short yellowish cinereous pubes- 

 cence ; head deusely, roughly punctate ; epistoma at base narrower than the 

 space between it and the eye ; antenna? piceous, joints four to ten serrate and 

 gradually shorter, the eleventh elongate oval ; thorax slightly longer than wide, 

 sides rounded near the front angles, bind angles slightly divergent and with a 

 short carina, disc convex, a slight median depression, a slight oblique depression 

 on each side of the middle of the base, surface densely, roughly, submuricately 

 punctate ; anterior supplementary carina arcuate, directed downwards, tending 

 to become parallel with the anterior margin, posterior supplementary carina 

 long, extending three-fourths to the front; propectus with large but shallow 

 punctures, the rudimentary antennal groove smooth ; elytra narrower than the 

 thorax, gradually attenuate posteriorly, disc vaguely striate, the surface closely 

 and submuricately puuctate; body beneath and abdomen rather coarsely and 

 closely punctate ; femora piceous, tibite and tarsi paler ; last ventral segment ob- 

 tuse. Length .14- .16 inch ; 3.5 - 4 mm. 



This insect seems to be very rare, I have seen but one specimen 



collected in Maryland and kindly loaned me by Mr. Ulke. 



MICRORHAGUS Esch. 



Form elongate, usually narrower posteriorly ; antennse at least half as long as 

 the body, second joint small, third usually nearly as long as the next two, four 



