170 MEMOIRS ON THE COLEOPTERA 



have observed that the head is relatively somewhat larger in the 

 female than in the male, sometimes, as in the case of Harpalus 

 viduus, notably larger. 



Tribe ANISODACTYLINI. 



This is a large tribe and one of the most clearly circumscribed of 

 the subfamily. The body is oblong and more or less stout and 

 convex, the anterior and middle tarsi of the male having dense 

 homogeneous pads of erect squamiform pubescence beneath. 

 Otherwise there is considerable variety of structure, sculpture and 

 coloration. The terminal spur of the anterior tibiae is remarkably 

 diversified in form, in some groups being slender and simple, in 

 others subbasally swollen or angulate on one or both sides to 

 strongly trifid, but the form of this spur is somewhat misleading 

 from a taxonomic viewpoint and does not necessarily indicate the 

 degree of generic relationship. I have however found some other 

 structural features, such as the mentum, ligula and paraglossae, 

 to be of very decided value, the division of those generic groups 

 having a distinct mentum tooth into two sections according to the 

 form of the paraglossse, for example, being very sharply drawn and 

 devoid of ambiguity. The genera are numerous, those represented 

 before me being as follows: 



Mentum not toothed 2 



Mentum with a clearly denned angulate tooth n 



2 Basal joint of the hind tarsi more elongate, fully as long as the next 



two combined and often longer 3 



Basal joint shorter, as a rule not as long as the next two combined; ligula 



and paraglossae somewhat as in Anisodactylus 8 



3 Abdomen impunctate, excepting the usual basal punctulation 4 



Abdomen punctured over the entire surface, the elytra also closely and 

 uniformly punctate throughout; terminal spur of the anterior tibiae 



slender and simple or nearly so 7 



4 Ligula increasing moderately in width apically, the tip more or less 

 evidently expanded, the paraglossae obtusely prolonged to a moderate 

 degree externally at apex; elytra and abdomen not punctulate or 

 pubescent; hind angles of the prothorax sharply denned to rather 



broadly rounded; hind tarsi long, glabrous above 5 



Ligula narrow, not expanded at apex ; hind tarsi long and glabrous above . 6 

 5 Terminal spur of the anterior tibiae strongly and acutely trifid. 



Nearctic regions. [Gynandrotarsus Laf.] Triplectrus 



Terminal spur simple or nearly so, acute, sometimes subangularly swollen 

 near the base. Nearctic and palaearctic regions. [AplocentrusLec.]. 



Anisodactylus 



