THE SIIOKT-WTXCEI) R('A\'EKrrErL BEETLES. 467 



Gboup D. 



Small, slender species having the side margin of thorax acute, 

 the flanks deeply but narrowly concave; prosternal sutures want- 

 ing ; coxal fissures short and closed ; hind angles of thorax obtuse. 



901 (2745). BuLDius cokdat-ds Say, Trans. Amer. Phil. Soc., IV, 1834, 461; 

 ibid. II, 576. 

 Elongate, very slender. Black ; elytra dull yellow with a wide fuscous 

 sutural stripe ; antennae and legs dull yellow, the former dusky at tip. Head 

 broad, flat, finely granulated. Thorax one-third wider than long, sides sub- 

 parallel, rounded behind; disk finely gi-anulate, very sparsely and irregu- 

 larly punctate, the median line distinct. Elytra slightly wider and one- 

 third longer than thorax, finely and rather densely punctate. Abdomen at 

 base narrower than elytra, finely granulate, nearly smooth above, distinctly 

 punctate beneath. Length 4 mm. 



Lake Coimty; rare. ]May 21. A sea-coast species which will 

 probably be found all along the shore of Lake ^lichigan. 



Plaiysteihus amcricanus Eriehs., 3 mm. in length, black, shin- 

 ing, elytra fusco-piceous. tibisB and tarsi pale, is recorded from Cin- 

 cinnati, and very probably occurs in southern Indiana. 



LXXIII. OxTTELUs Grav. 1806. (Gr., "a pointed end.") 



Small, depressed black or piceous species having the head usu- 

 ally as wide as thorax, the middle coxa somewhat separated and the 

 front tibiffi with a single row of spines. 



KET TO INDIANA SPECIES OF OXTTELUS. 



a. Thorax coarsely sculptured, more or less shining. 



6. Head rounded immediately behind the eyes, which are large ami 

 prominent; thoracic grooves deep; length 3.5—1 ram. 



902. SCtLPTUS. 



6&. Head prolonged behind the eyes, the latter moderate in size. 



c. Sides of thorax crenulate; piceous, legs and base of antennae dull 

 yellow; front flat; length 4.2-5 mm. Brcosis. 



cr. Sides of thorax entire. 



(7. Front of head concave, its apical margin elevated : miter thoracic 

 groove feeble ; length 3.5-4.5 mm. 9(1:;, penxsylvanicus. 



(Id. Front of head flat, not margined at apex. 



c. Vertex flat, not channeled ; thorax strongly punctured ; male 

 with apical margin x>{ front extended forward in a short. 

 sharp process; length 2.5-3 mm. 904. insigxitls. 



ec. A'ertex convex, feebly channeled, 



f. Front polished ; dorsal grooves of thorax distinct ; length 

 1,7-2 mm. 905, suspectis. 



ff. Front opaque ; dorsal grooves obsolete ; length 2.3 mm. 



906. PLACITSINrS. 



