24 MEMOIRS ON THE COLEOPTERA. 



only a small proportion of the very confusing host of such species 

 inhabiting various species of fungi: 



Atheta rhodeana n. sp. Moderately slender and convex, slightly, the 

 abdomen strongly, shining, finely, closely subgranularly punctate, the ab- 

 domen minutely and sparsely; vestiture short; color piceous-black, the 

 elytra and legs pale brownish-flavate, the abdomen at tip and broadly toward 

 base rufescent; antennae fuscous, paler basally; head as usual, transverse, 

 parallel, with broadly rounded angles, the eyes at about their own length 

 from the base ; carinse very fine and feeble but entire ; antennae well developed, 

 the outer joints slightly wider than long, the second slightly shorter than the 

 third; prothorax moderately transverse, parallel, evenly rounded at the 

 sides, much wider than the head and evidently narrower than the elytra, 

 scarcely modified medially; elytra large, but slightly transverse, parallel, 

 much longer than the prothorax; abdomen distinctly narrower than the 

 elytra, parallel, the fifth tergite very little longer than the fourth, the sixth 

 ( d") trapezoidal, with the apex truncate, even, with a large externally rounded 

 and rather thick auriculiform impressed process at each side and not at all 

 projecting posteriorly; mesosternal process finely aciculate at tip, extending 

 to apical third of the not quite contiguous coxae and well separated from 

 the angular metasternal projection; hind tarsi with the first four joints 

 equal or with the first just visibly shorter than the second. Length 2.5 mm.; 

 width 0.56 mm. Rhode Island (Boston Neck). 



The auriculae of the sixth male tergite are rather better developed 

 in this species than in any of the following: 



Atheta capella n. sp. Much stouter than the preceding and paler in color, 

 the darker parts not black but dark piceous-brown, the punctuation rather 

 less dense and finer, the pubescence less abundant and longer ; head smaller, the 

 eyes larger, at barely two-thirds their length from the base, the carinae fine, 

 not quite entire; antennae rather long, the outer joints slightly wider than 

 long, the second much shorter than the third; prothorax much larger, fully 

 as wide as the elytra, nearly one-half wider than the head, the sides rounded, 

 notably arcuato-convergent anteriorly, nearly one-half wider than long; 

 elytra moderately transverse, the suture not greatly though distinctly longer 

 than the prothorax; abdomen much narrower than the elytra, parallel though 

 narrowing slightly apically, the fifth tergite slightly longer than the fourth, 

 the sixth ( d") sinuato-truncate at apex, with the large auricular sides more 

 rounded and reflexed externally; sterna nearly similar, the hind tarsi with 

 the first joint very much shorter than the second. Length 2.5 mm.; width 

 0.65 mm. Rhode Island (Boston Xeck). 



Very distinct from the last in its larger and more anteriorly 

 narrowed prothorax, larger eyes and less parallel abdomen. 



Atheta comitata n. sp. Much smaller, more slender and parallel, rather 

 strongly shining, nearly similar in coloration and sculpture, the vestiture 

 shorter especially on the abdomen, nearly as in rhodeana; head relatively 

 larger, the eyes somewhat prominent, very well developed, at much less 



