120 MEMOIRS ON THE COLEOPTERA. 



nal process extending slightly behind the middle of the coxae, its 

 finely aciculate apex considerably removed from the short and 

 broadly obtuse or rounded metasternal projection, the intervening 

 acute ridge much depressed. The hind tarsi are slender, with the 

 four basal joints about equal. The antennae more nearly resemble 

 those of Dimetrota, though shorter as a rule, and are always much 

 more slender than in Sableta or its attached subgenera. A minute 

 European species before me, identified as Datomicra celata Er., has 

 sternal characters greatly differing from those of zosterce, the coxae 

 being rather widely separated, the mesosternum rather obtusely 

 tipped, the metasternal projection angulate and the interval be- 

 tween the sternal apices broadly convex and not much depressed. 

 Some species here described as Datomicra are still more heteroge- 

 neous; but subgeneric modifications seem to be unending in the Aleo- 

 charinae. 



Datomicra decolorata n. sp. Slender, parallel, subopaque, pale piceo- 

 flavate, the pronotum more rufous, the abdomen infumate distally, the legs 

 pale; punctures dense and asperate, numerous but very fine on the more 

 shining abdomen; head rather small, wider than long, the prominent eyes at 

 nearly their own length from the base, the tempora less prominent and grad- 

 ually arcuato-converging to the base, the carinae fine, subentire; antennae pale 

 piceous, rather long, the second joint about as long as the first, longer than 

 the third, the outer joints distinctly incrassate and transverse, the eleventh 

 gradually pointed and fully as long as the two preceding; prothorax trans- 

 verse, parallel and very feebly arcuate at the sides, rounding and narrowing 

 anteriorly, much wider than the head and fully as wide as the elytra base, not 

 very definitely impressed, the median line minutely and feebly striolate, 

 becoming more impressed at the base; elytra moderately transverse, with 

 very feebly diverging sides, the suture nearly a fourth longer than the pro- 

 thorax; abdomen much narrower than the elytra, long, parallel, the sixth 

 tergite (c?) with the three intervals about equal, the two median teeth small, 

 prolonged anteriorly for a very short distance in feeble ridges, the lateral un- 

 usually long and straight. Length 1.6 mm; width 0.28 mm. New York 

 (Catskill Mts.). 



The pallid coloration seems to be a normal character in this 

 species, judging from its constancy through an ample series of 

 examples; it may be known by this character and, from the fol- 

 lowing three forms, by the prothorax being fully as wide as the 

 elytral base. 



Datomicra inopia n. sp. Slender and moderately convex but more fusoid, 

 alutaceous, finely, closely and asperately punctate, the head and abdomen 

 more shining and less strongly sculptured; color piceous-black, the elytra 



