152 NORTH AMERICAN 



Tlie jicnus Bryoporus cannot |»roperly be separated from Bolitobius 

 by tbe form of the maxillary palpi, as this organ is identical in struc- 

 ture in many parallel cases. The three rows of elytral punctures in 

 Bolitobius ai)pears to be a very constant character, and taken in con- 

 nection with the much more linear parallel form of the body, and 

 polyserial punctuation of the elytra in Bryoporus, forms apparently a 

 much more steadfast mark of distinction than can possibly be main- 

 tained from the palpal structure. The very long posterior tarsi in 

 Bryoporus is another distinctive feature, and there are differences in 

 the form and extent of the elytral epipleurae. 



The present species differs greatly from rufescens in size and punc- 

 tuation of the elytra, and very distinctly in the structure of the elytral 

 epipleurae and number of [)unctures along the crest of its up[)er margin. 



IttYCETOPORUS M:nin. 



M. iiKluisitlls n. sp. — Form somewliat robust. Head bhick ; protho- 

 rax (lark reddish-testaceous; elytra dark piceo-testaceous, very indelinitely 

 darker and brownish along the sides, and near the suture ; abdomen piceous- 

 black, apices of tlie segments jjaler ; under surface of body intense black, 

 legs pale testaceous, oral organs and basal joints of antennae same, remain- 

 der of antennae dark piceous-l)ro\vn, terminal joint pale toward tip. Head 

 very highly ])olished, small, distinctly wider than long ; labrum paler, rather 

 convex ; maxillary palpi rather slender, second joint slightly bent, feebly 

 narrowed toward base, more tlian twice as long as wide, third nearly as long 

 as the first two together, narrowed toward base, nearly three times as long 

 as wide, swollen toward tip which is squarely truncate, fourth nearly two- 

 thirds as long as the third, very slender, finely acicular, abruptly swollen 

 and somewhat bulbous toward base ; antennae distinctly shorter than the 

 head and prothorax together, first joint slender, about as long as the next 

 two together, second scarcely narrower than the first, nearly twice as long as 

 wide, oval, third just visibly sIkm tii' than the second, conical, very narrow 

 at base, as wide at apex as the scc-ond, joints four to ten increasing in width, 

 the former very sliglitly longer than wide, the latter nearly one-half wider 

 than long, fourth slightly shorter than the fifth, fifth to tenth equal in 

 length, eleventh scarcely longer than wide, oval, outer joints slightly com- 

 pressed. Prothorax widest at one-fourtli the length from the base where 

 it is one-fointli wider than long ; sides moderately arcuate ; basal angles 

 broadly rounded ; apex Vi^ry feebly arcuate, two-tiiirds as long as the base, 

 tbe latter broadly and very feebly arcuate ; disk rather convex, highly 

 polished, most excessively feebly minutely and transversely strigate, having 

 on each side at the outer two-thirds two setigerous punctures, round and 

 rather deeply impressed, the posterior one at the middle, the anterior slightly 

 nearer the meilian line ; the usual two apical punctures are rather distant 

 from the margin. Elytra at base scarcely as wide as the pronotum ; sides 

 very slightly divergent posteriorly and very feebly arcuate; together very 



