THE SHOET- WINGED SCAVENGER BEETLES. 



densely and rather finely punctate. Abdomen sparsely and finely punctate 

 above, more distinctly beneath. Length 8-9.5 mm. 



One in Wolcott collection From beach of Lake Michigan near 

 Pine, Lake County. June 6. Known from Michigan, Kentucky 

 and the northwest. 



XXXVI. Actobius Fauvel. 1875. (Gr., "shore + I live.") 



Small, slender, sparsely pubescent species having the last joint 

 of maxillary palpi conical, acute and longer than the next to last 

 joint; the first joint of hind tarsi equal to or shorter than fifth. 

 The males have the front tarsi more or less dilated and the last 

 ventral emarginate, often feebly so. Twenty-three species are listed 

 from the United States. Of these the following have been taken or 

 probably occur in Indiana : 



KEY TO INDIANA SPECIES OF ACTOBIUS. 



a. Upper surface black or piceous. 



J). Elytra very densely punctured and opaque. 



c. Head opaque, very finely and densely punctured both above and 

 below. 755. cinerascens. 



cc. Head more or less shining, punctures above coarse and much less 

 dense. 



d. Thorax oval, very little longer than wide. 



e. Elytra longer than thorax, the latter not narrower behind. 



756. NANUS. 



ee. Elytra not longer than thorax, the latter very plainly narrowed 

 behind. inutilis. 

 dd. Thorax oblong, much longer than wide; elytra depressed, paral- 

 lel, longer than thorax. 757. fraterculus. 

 bh. Elytra more or less shining, their punctures distinct. 



f. Thorax oblong, narrower behind, its punctures numerous, irregu- 

 larly placed; elytra distinctly longer than thorax, paler at tips, 

 the punctures sparse and rather coarse. 758. sobrinus. 



ff. Thorax more or less oval, not narrowed behind, the punctures few- 

 er and arranged in three irregular rows each side. 

 g. Elytra finely and rather densely punctured ; larger, 5-6 mm. ; 

 piceous, the legs pale. 

 //. Elytra very densely punctured; front tarsi of male very broad- 

 ly dilated. patella. 

 hh. Elytra shining, less densely punctured; front tarsi of male 

 much less dilated. 759. loxatus. 



gg, Elytra coarsely punctured; smaller, not over 3.5 mm.; antennae 

 and legs pale. 760. parous. 



aa. Ricolored species ; thorax and legs always yellow. 



i. Abdomen above and beneath rather densely punctured, feebly or not 

 at all shining. 



