322 Coleopferological Notices, V. 



MYRI^EDOBflA Erichs. 



Even within our own faunal limits, this interesting genus varies 

 wonderfully in the degree of separation of the intermediate coxae, 

 which is usually a character of considerable taxonomic value. It 

 is only a striking example, however, of the fact frequently observed 

 in large groups of arthropods, that characters unquestionably of 

 general significance in defining genera may, in certain parts of the 

 series, abruptly and unexpectedly lose all such weight. 



The few species known to me may be distinguished by the fol- 

 lowing characters : — 



Punctures of the pronotum extremely fine. 



Apex of the mesosternal process moderate in width. 



Basal joint of the antennae large, extremely robust and pyriforra ; pro- 

 thorax strongly transverse; middle coxae rather narrowly separated 



{Platyum Csy.) SOnoiliae 



Basal joint of the antennae more slender, sometimes moderately constricted 

 at base ; middle coxae more widely separated. 

 Prothorax transverse, the sides not at all sinuate toward base. 



caliginosa 

 Prothorax but slightly wider than long, the sides broadly sinuate 

 toward base. 

 Third antennal joint greatly elongated, nearly as long as the next 



two; tenth but slightly wider than long faUTeli 



Third joint much shorter, but slightly longer than the second ; tenth 

 very strongly transverse ; eleventh large, nearly as long as the 



preceding three combined angustllla, 



Apex of the mesosternal process extremely wide, straight, truncate and 



rather wider than the distance separating the antennae loricata 



Punctures of the pronotum normal but coarse and sparse, somewhat as in 



Zyras hawortJii but less remote and more even in distribution obliqiia 



Punctures of the pronotum sparse, strong and tuberculiform, at least in the 

 male. 

 Elytral punctures very coarse, deep and rather sparse ; abdomen coarsely 



spaisely and unevenly punctate, testaceous in color I*lldis 



Elytral punctures fine and dense ; abdomen subimpunctate planifer 



"Confertim subtilissime punctata, fusca, antennarum basi, thoracis lateribus, 

 pedibus elytrisque testaceis, his sutura, basin versus latins, angulisque 

 apicalibus oblique late infuscatis ; thorace transverso, obsoletius canalicu- 

 lato, basi leviter trans versim foveolato. Long. 1^ lin. Lat. f lin. Penin- 

 sula Kenai." angularly 



