86 MEMOIRS ON THE COLEOPTERA. 



moderately rounded at the sides, the eyes not prominent, well developed 

 but at their own length from the base, the carinae fine and not quite 

 entire; antennae long, gradually moderately incrassate, piceous-brown, 

 slightly paler basally, the second joint longer than the third, the latter 

 much elongated, fourth distinctly longer than wide, the outer joints 

 very moderately transverse, the last ovally pointed and as long as the 

 two preceding; prothorax less than a third wider than long, parallel, 

 with evenly and very moderately rounded sides and rounded base, the 

 median line distinctly impressed from near the apex to the base; elytra 

 slightly shorter than wide, with just visibly diverging and nearly straight 

 sides, at base but slightly, at apex more noticeably, wider, the suture 

 impressed at base and a third longer, than the prothorax; abdomen per- 

 fectly parallel, with nearly straight and rather thin margins, slightly 

 narrower than the elytra, the fifth tergite barely at all longer than the 

 fourth; hind tarsi not very long or thin, the basal joint almost as long as 

 the second. Length 2.5 mm.; width 0.68 mm. New Jersey. 



The female type has the sixth tergite broad and very broadly, 

 feebly arcuate at apex, the sixth ventral plate large and semicircular. 

 At first sight this species greatly resembles a Stethusa, but the middle 

 coxae are only narrowly separated and the mesosternal process 

 very slender and gradually aciculate, showing that there is no close 

 relationship, as might be inferred also from the much smaller eyes. 



Atheta (Delphota) logica n. sp. Rather stout, parallel, moderately 

 convex, the lustre, sculpture and vestiture nearly as in the preceding, 

 the coloration also virtually similar; head more transverse, the sides 

 parallel, rounded basally, the eyes not prominent, at their own length 

 from the base, the carinae fine, feeble and irregular; antennae moderately 

 long, gradually strongly incrassate and thick distally, piceous, gradually 

 pale flavate basally, the second and third joints only moderately elongate 

 and equal, fourth slightly longer than wide, the outer joints about a 

 fourth wider than long, the last gradually pointed from near the base 

 and a little longer than the two preceding; prothorax two-fifths wider 

 than long and two-fifths wider than the head, parallel, with moderately 

 and subevenly rounded sides, rather more converging at apex, the median 

 line wholly unimpressed but with a very faint ante-scutellar impression; 

 elytra distinctly shorter than wide, at base very slightly wider than the 

 prothorax, the suture a fourth to nearly a third longer; abdomen nearly 

 as in the preceding species, except that it is slightly though very percep- 

 tibly narrowed apically; middle coxae narrowly separated, the mesosternal 

 process gradually becoming very acute and extending to their apical 

 third, where it is separated from the well developed triangular meta- 

 sternal projection by barely a third of the femoral width. Length 2.0- 

 2.2 mm.; width 0.58-0.68 mm. Pennsylvania (near Philadelphia). 



The sixth tergite of the female is transversely subtruncate at tip, 

 with moderately rounded angles. This species is distinguishable 



