NATURAL SCIENCES OF PHILADELPHIA. 309 



Sides of prothorax oblique, angles obtuse; adstricta Dej., oblongiuscula 

 Motscli., ohtusangula Motsch. 65. orinoTmim Lee. 



Sides of prothorax more narrowly depressed: 



Sides of prothorax oblique, angles obtuse; Q-ptmctatus Mann, seriepunc- 

 tatuslslanw. 6G. LuczotiiY)c]. 



Larger, prothorax more narrowly margined, sides slightly sinuate behind, 

 angles rectangular; colligatus Walker. 67. oregonus Lee. 



Division 4. Elytra with dorsal punctures; palpi with the last joint elongate 

 oval, scarcely truncate. (Small species.) 

 Prosteruum finely margined behind : 

 Episterna of metathorax elongate : 

 Scutellar stria wanting : 

 Prothorax rounded, broadly margined ; dorsal punctures 3. A. 



Prothorax narrowed behind, finely margined ; dorsal punctures 2. B. 

 Scutellar stria long ; dorsal punctures 3; Argutor. C. 



Episterna of metathorax short, dorsal punctures 4-6 : 



Scutellar stria variable; Cryobitjb. D. 



A. 



(Posterior tarsi with 4 joints grooved on the outer side. Body oval elongate, 

 head rather small, prothorax nearly square with very rounded angles, 

 sides widely depressed towards the base, basal impressions single deep, 

 impunctured.) 



Shining black, antennae, palpi, and legs ferruginous ; Platyderus nitidus 

 Kirby. 08. erythropus Dej. 



B. 



(Posterior tarsi with 3 joints grooved on the outer side. Body of usual 

 form, prothorax narrowed slightly behind, angles obtuse not rounded, 

 basal impressions double, outer one punctiform ; scutellar stria puue- 

 tiform, dorsal punctures 3 ; prosternum margined at tip. ) 



Bronzed, antenna?, palpi, and legs ferruginous. 69. splendidulus Lee. 



C. 



(Posterior tarsi with three joints grooved on the outer side; prothorax feeblj' 

 narrowed behind, angles not rounded, basal impressions single, base 

 finely margined each side. 



Elytral striae impunctured ; hind angles of prothorax subrectangular, 

 slightly prominent, antennte and legs dark ferruginous. 



70. patruelis Dej. 



Elytral striae punctured as far as the middle ; form less slender, hind 

 angles more distinctly obtuse ; antennse and legs dark ferruginous, 

 thighs usually piceous. a. Striae strongly punctured ; desidiosus Leo. 

 B. Striae indistinctly punctured. 71. femoralis Kirby. 



