34 MEMOIRS ON THE COLEOPTERA. 



distally, the outer joints rather transverse, the eleventh long, obtuse at tip, 

 longer than the two preceding, the second longer than the third, which is 

 obconic and only slightly elongate; prothorax evidently though not very 

 greatly wider than the head and correspondingly a little narrower than the 

 elytra, moderately transverse, parallel, moderately rounded at the sides 

 anteriorly, a little less so basally, feebly impressed along the median line; 

 elytra distinctly transverse though much longer than the prothorax; ab- 

 domen perfectly parallel and straight at the sides throughout, narrower 

 than the elytra, the fifth tergite much longer than the fourth, the sixth (d 1 ) 

 broadly, subangularly sinuate at apex, the edge even, the adjacent surface 

 however with a series, of small elevations separated by small punctures, 

 the sides obliquely cariniform and elevated, the carina not posteriorly prom- 

 inent though acute-angled; surface evenly and transversely convex from side 

 to side, strongly reticulate; mesosternal process long and rather broad, trun- 

 cate at tip and separated by but little more than its own apical width from the 

 metasternal projection, which is nearly as long as wide, with the apex rounded ; 

 basal joint of the hind tarsi but little shorter than the second. Length 2.3 

 mm.; width 0.48 mm. New York (Catskill Mts.). 



The broad sterna and the structure of the antennae, as well as 

 the male sexual characters, show that this small species is not closely 

 allied to any other here described. 



The following six species are distinguished in each instance by 

 some remarkable peculiarity of the male sexual characters, which 

 will be readily recognized. 



Atheta marinica n. sp. Small, rather slender, moderately convex, black, 

 the prothorax blackish, the elytra pale piceous-brown, clouded apico-ex- 

 ternally; legs very pale, the antennae brown, pale basally; surface finely 

 punctate, the punctures sparse and simple on the head, close and strongly 

 asperate on the pronotum and elytra; head but little wider than long, the 

 eyes convex, at less than their own length from the base, the carinse fine and 

 far from entire; antennae rather short, rapidly and strongly incrassate, the 

 outer joints strongly transverse, the second and third equal, moderately 

 elongate and obconical; prothorax moderately transverse, only slightly 

 wider than the head but distinctly narrower than the elytra, parallel, with 

 the sides only feebly arcuate, virtually unimpressed; elytra large, but slightly 

 wider than long, very much longer as well as wider than the prothorax; 

 abdomen polished, minutely, sparsely punctulate, much narrower than the 

 elytra, parallel, the border rapidly thinner behind, the fourth and fifth tergites 

 equal, the sixth (d 31 ) transversely truncate at tip, the truncature bearing four 

 short stout teeth of equal length, the two median, rounded and tuberculiform, 

 separated by nearly twice the more concave interval between either and the 

 lateral, the latter more angulate but not more prominent; mesosternal 

 process moderate in length and acuteness, separated from the long and sharply 

 angulate metasternum by a short though very deep interval; hind tarsi 

 with the first joint subcylindric and slightly shorter than the second, two to 

 four equal and obconic. Length 2.4 mm.; width 0.5 mm. California 

 (Mill Valley, Marin Co.). 



