98 GEO. H. HORN, M. D. 



strife deep and broad, indistinctly punctate at bottom, the lateral strife less dis- 

 tinct than the dorsal, intervals convex, smooth. Mesosternum feebly shining, 

 the surface slightly scabrous. Metasternum short, body apterous, the sides alu- 

 taceous. Abdomen alutaceous, each segment with a transverse row of indistinct 

 setigerous punctures. Posterior femur elongate oval, the marginal line indis- 

 tinct, the tibije stout, without oblique ridges, the outer edge with four spinules 

 in two transverse pairs, the inner edge serrulate as usual, the spurs short, but 

 acute at tip, the tarsus very short, the first four joints triangular. Length .10 

 inch ; 2.5 mm. 



This species and the preceding by their convex form and inflated 

 elytra have far greater resemblance to Aegialia than to the other 

 Psammodius. They are both truly members of the present genus 

 as shown by the entirely concealed labrum and mandibles. 



The differences between hydropicus and ccelatm are many, as will 

 be seen in the description, the more striking are given in the synoptic 

 table. 



One specimen. Savannah, Ga. 



The following species still remains unknown to us, and it is im- 

 possible to say whether it is a Psammodius or Aegialia : 



Aphodius clypeatus Say. — Black; elytra testaceous; clypeus covered 

 with small tubercles. 



Inhabits Northwest Territory. 



Head black, convex, covered with very small, obtuse tubercles ; 

 edge a little elevated, piceous ; tips hardly truncated ; thorax with 

 irregnlar, small, obtuse rugae ; anterior angles rectangular ; posterior 

 edge regularly arcuated, not dilated in the middle ; elytra rufotesta- 

 ceous, dusky at base ; with deep, punctured striae ; interstitial lines 

 convex ; thighs dull yellowish ; posterior ones much dilated. 



Length more than three-twentieths of an inch [4 ram.]. Readily 

 distinguished by the rough appearance of the clypeus. 



^GlAIilA Latreille. 



The mandibles and labrum are always distinctly visible beyond 

 the clypeus. The head is nearly always verrucose, more obviously 

 in the shorter and more ventricose species, less so in those of more 

 elongate form. 



Although the metasternum is short in the majority of the species 

 the body is winged, generally very feebly. 



The legs are stout and strongly fossorial, the anterior tibiae espe- 

 cially broad and with large external teeth. The tarsi are rather 

 short and the claw^s small. As the species are arranged in the fol- 



