134 MEMOIRS ON THE COLEOPTERA. 



require careful observation in order to separate them, are not unlike 

 Datomicra, and it is probable that some one of them at least has 

 been placed in that genus or Microdota. The body is subparallel, 

 generally intense black and with very roughly asperate sculpture, 

 the middle coxae very widely separated, the mesosternum not ex- 

 tending materially beyond their middle point, with its broad and 

 rectilinearly truncate apex separated from the very short and broadly 

 obtuse metasternum by a rather long, scarcely at all depressed, very 

 broadly and feebly convex interval ; the hind tarsi are slender, with 

 the four basal joints equal and with a fringe of coarse setae beneath. 



Arisota tetricula n. sp. Elongate-fusoid, slightly convex, deep black, 

 the elytra feebly piceous, the legs paler piceous, slightly shining, finely and 

 asperately punctate, with distinct micro-reticulation, which is coarse on 

 the shining abdomen, where the asperate punctures are numerous and distinct 

 and the general sculpture very rough; pubescence short, distinct; head 

 nearly as long as wide, orbicular, the eyes large, at less than their own length 

 from the base, the carinae entire and rather strong; antennae black, moderate 

 in length, loose, slender, only very feebly incrassate, the second and third 

 joints each shorter than the first, elongate, the third the shorter, the fourth 

 quadrate, the outer joints slightly wider than long, the last pointed, not 

 quite as long as the two preceding, the bristling setae sparse but conspicuous; 

 prothorax moderately transverse, subparallel and rounded at the sides, a 

 little narrower at apex than at base, much wider than the head and a little 

 narrower than the elytra, very feebly impressed along the median line basally; 

 elytra rather transverse, arcuato-truncate at the apices externally, the 

 suture about a sixth longer than the prothorax; abdomen narrower than the 

 elytra, parallel basally, rather strongly tapering apically, the fifth tergite 

 longer than the fourth. Length 1.7 mm.; width 0.38 mm. New York 

 (Ithaca and Catskill Mts.). 



Sexual characters appear to be feeble, most of the specimens 

 having the sixth tergite feebly sinuato-truncate and the sixth ventral 

 plate broadly arcuato-truncate. 



Arisota insueta n. sp. Form nearly as in the preceding, deep black through- 

 out, the elytra not paler, the legs dark piceous, paler distally; surface highly 

 shining, the micro-reticulation wholly obsolete anteriorly and very feeble 

 on the elytra, coarse but feeble on the abdomen, the strongly asperate punc- 

 tures close-set and very conspicuous; head throughout nearly as in the 

 preceding, the slender and very feebly incrassate antennae a little shorter 

 and more compact, deep black throughout, the second joint about as long 

 as the first, much longer than the third; prothorax convex, less parallel, 

 the sides distinctly converging and only feebly arcuate from base to apex 

 and with a larger basal impression, its relationships with head and elytra 

 nearly similar; elytra and abdomen nearly similar. Length 1.65 mm.; 

 width 0.35 mm. Rhode Island (Boston Neck). 



