NORTH AMKllITAN COLEOPTERA. 175 



IVIECYiVOTAKSHS Laf. 



This genus was separated by Laferte from JVofo.nis hy the structure of 

 the tarsi. On all the legs the tarsi are slender and iiiucli longer than in 

 N^nfoxKs, and tlie penultimate joint is simple. 



Three species are now known in our fauna, two from the Atlantic re- 

 gion and one from California. 'J hey may be distinguished in the follow- 

 ing manner : 



Elytra verv minutely punctured, the surface clothed with vci'y fine silken pu- 

 bescence; color pale testaceous. 

 Thorax oval, narrowed behind, not wider than long; elytra testaceous, with a 



sutural cloud delicatuliis. 



Thorax transverse, elytra pale testaceous CHiKlidus. 



Elytra coar.sely punctured: surface densely clothed with silvery white and 

 brown scale-like hairs, forming a conspicuous design; color black; head, 

 thorax and legs rufo-testaceous elcgans. 



i?I. (ielicatuliis Horn. — Pale testaceous, elytra with a common sutural pice- 

 ous clouding; surface clothed with fine silken pubescence; head finely punctured, 

 front fiat; thorax oval, somewhat narrowed behind, as long as wide; surface 

 rather densely punctate, horn large and broad, triangular, margined at the sides, 

 .suddenly narrowed at base, and rather finely serrulate, the crest narrow, margined 

 incompletely in front, finely serrulate, and with a central carina; elytra oval, the 

 humeri distinct, ai)ices conjointly rounded, the sutural angle slightly -obtuse; sur- 

 face densely punctulate and sub-opaque; body beneath colored as above, finely 

 punctulate and pubescent. Length .10 inch; 2.5 mm. 

 I have seen but three specimens, all females. 

 Collected at Fort Yuma, California. 



]fl. caildidus Lee. — Pale yellowish testaceous, almost translucent; surface 

 clothed with very fine silken pubescence; head finely and densely punctulate, 

 front Hat; thorax oval, broader than long, rather densely and finely punctulate, 

 horn moderate in size, triangular, suddenly narrowed at base, margined and ser- 

 rulate all around, crest feebly elevated, narrow, feebly margined and serrulate; 

 elytra oval, very finely and densely punctulate ; humeri distinct, but obtuse ; apices 

 conjointly rounded in both sexes, with the sutural angle obtuse; body beneath as 

 above. Length .08 inch; 2 mm. 



The males have the last ventral segment more obtuse, and with a dis- 

 tinct depression at middle. 



An extremely delicate species, much paler than delicatultis, v?ith finer 

 pubescence and less distinct punctuation. 



Occurs at Fortress Monroe and in South Carolina. 



jH. elegans Lee. — Pieeous, nearly black; head, thorax and legs rufo-testa- 

 ceous; head punctulate with fine silken pubescence, front convex ; thorax nearly 

 globose, moderately convex, rather coarsely and moderately densely punctured, 

 densely clo,hed with brown scale-like hairs on the disc, silvery white at the aides 

 and base, horn moderate, suddenly narrowed at base, margined on each side 



