THE LAMEIiLICORN BRKTLES. 



921 



have been taken in Indiana, wMle those of two others may occur. 

 The following is the principal literature treating of the North Amer- 

 ican representatives of the tribe : 



Horn. — "Description of the species of Aphodius and Dialytes 



of the United States, 1 ' in Trans. Amer. Entom. Soc, III, 



1870, 110-134. 



Horn. — "Synopsis of Aphodiini of the United States," in Trans. 



Amer. Ent. Soc, III, 1871, 281-297. 

 Horn. — "A Monograph of the Aphodiini inhabiting the United 



States," in Trans. Amer. Ent. Soc, XIV, 1887, 1-110. 



KEY TO INDIANA GENERA OF APHODIINI. 



a. Mandibles visible beyond tbe clypeus. VI. iEGiALiA. 



aa. Mandibles concealed beneatb tbe clypeus. 



t. Hind tarsi witb triangular joints. VII. Psammodius. 



66. Hind tarsi witb elongate, usually cylindrical, joints. 



c. Head roughly granulate ; thorax transversely grooved. 



d. Thorax without a marginal fringe of hairs, the grooves short, 



confined to the sides ; one or more of the ventral segments cari- 

 na te. VIII. Pleurophorus, 



dd. Thorax with scale-like marginal hairs, the grooves entire ; ven- 

 tral segments not carinate. Rhyssemus. 

 cc. Head punctured or slightly rugose; first five striae of elytra not 

 reaching apical margin. 



e. Outer apical angle of hind tibise prolonged, spinif orm ; color 



black. IX. ATiENius. 



ee. Outer apical angle of hind tibiae obtuse. 



/. Front tibia? with upper teeth of outer margin obsolete. 



Dialytes. 



//. Front tibice strongly toothed on the outer margin ; elytra sim- 

 ply striate; color usually variegated. X. Aphodius. 



VI. Mgiaiaa Lat. 1807. (Gr., "shore.") 



In this genns the mandibles and labrum are visible beyond the 

 clypeus when viewed from above ; head more or less granulate or 

 roughened with small tubercles ; legs stout and strongly f ossorial ; 

 front tibiae broad and with large teeth on outer side. 



1739 (5469). JEgialia confekta Horn, Trans. Amer. Ent. Soc, III, 1871, 

 294. 



Oblong, convex, slightly broader behind. Piceous, the elytra sometimes 

 reddish-brown ; antenrae paler. * Head with rather coarse, close granules. 

 Thorax twice as wide as long, narrower in front, hind angles very obtuse ; 

 base curved, its marginal line distinct ; surface coarsely and sparsely punc- 

 tured, the sides smoother and with a small rounded pit. Elytra as wide at 



