8 MEMOIRS ON THE COLEOPTERA. 



rather well developed, almost three-fourths as wide as the prothorax, the large 

 eyes almost extending to the base as usual, the antennae moderately developed, 

 with the penultimate joints slightly wider than long, the last barely as long 

 as the two preceding; prothorax more nearly as wide as the elytra, moder- 

 ately transverse, parallel with rounded sides but with the base more rounded 

 than usual and with a small rounded discal foveola near the base; elytra 

 very little wider than the prothorax, much longer than in any of the preceding, 

 the suture infuscate basally and much longer than the prothorax; abdomen 

 shining, much narrower than the elytra, finely and not closely punctulate, 

 evidently pubescent, the sixth tergite (c?) with the median truncate lobe 

 about as wide as the interval between it and the lateral processes and limited 

 at each side by a strong swelling of the surface, its median part concave; 

 mesosternal process rather longer than usual, its truncate apex distant from 

 the metasternum by but little more than its own apical width, the metasternal 

 angulation much more rounded at tip than usual. Length 2.0 mm.; width 

 0.5 mm. Missouri (St. Louis). 



Departs rather radically from the preceding species in its longer 

 elytra, which are however together about a third wider than long, 

 and in recognizable differences in general form and sternal structure. 



Atheta (Stethusa) spuriella n. sp. Moderately stout, testaceous, the head 

 piceous, the elytra more flavate, the abdomen clouded posteriorly except 

 at apex; sculpture minute and dense, sparse on the elytra; head transversely 

 oval, the eyes not quite so large as usual, separated from the base by nearly 

 two-fifths of their length; antennae with the outer joints rather stout, de- 

 cidedly wider than long, the last as long as the two preceding; prothorax as 

 in subdebilis; head, prothorax and elytra increasing in even but gentle ratio 

 in width, the last as in subdebilis; abdomen and sexual characters nearly 

 as in that species, the swellings marking the median lobe of the sixth tergite 

 (cf) continued forward for a rather greater distance as obtuse ridges; sterna 

 nearly similar, the metasternal angle less rounded. Length 2.4 mm.; width 

 0.6 mm. New York (Catskill Mts.). 



This species and the preceding form a small group of Stethusa, 

 distinguished by a less sharply angulate metasternal angle, not 

 quite so large eyes, rather more transverse antennal joints, longer 

 elytra and more pronounced apical characters of the sixth male 

 tergite. Spuriella differs from subdebilis in its relatively larger 

 head and larger and more incrassate antennae, among the more 

 obvious characters. 



The following species is appended very doubtfully to this sub- 

 genus, as it differs markedly in general form and antennal structure, 

 though having the very broad mesosternum : 



Atheta (Stethusa) mendosa n. sp. Rather stout, moderately convex, not 

 parallel, distinctly shining and very minutely, not closely punctulate, the 



