HARPALIISLE 181 



basal joint, are nearly as in Triplectrus, except that the upper 

 surface is not completely impunctate and glabrous as in that 

 genus but has more or less evident, sparse and sometimes rather 

 strong punctures bearing erect pale seise and the basal joint is 

 relatively not quite so long. The terminal spur of the anterior 

 tibise is acute and generally swollen slightly or broadly angulate 

 on one side or at least asymmetrically toward base. The elytra 

 also differ greatly from those of Triplectrus in never having more 

 than one discal substrial puncture and in having no vestige of the 

 apical series of punctures on intervals 3-5-7; there is, however, 

 sometimes a fine suffused punctulation on the alternate intervals 

 at apex, homologous with that so well developed in Anadaptus 

 porosus Mots, and pitychrous Lee. The vertex generally has a 

 central rufous spot, not only in this genus but several others of the 

 tribe, which spot I have never observed in Harpalus. 

 The numerous species may be outlined as follows: 



Anterior tibial spur swollen and usually obtusely angulate at least on one 

 side near the base 2 



Anterior tibial spur very slender and simple; body small in size, the 

 surface lustre more or less metallic. (Aplocentrus Lee.) 22 



2 Color deep black throughout the body and legs, the upper surface 

 never having a trace of metallic lustre 3 



Color black, the tibiae and tarsi piceous, the upper surface with rather 

 strong but varied metallic lustre. Pacific coast 21 



3 Species of the Atlantic regions; body rather stout as a rule and with 

 deeper elytral striae except in furvus, the posterior thoracic angles 

 frequently somewhat rounded; head about half as wide as the 

 prothorax as a rule 4 



Species of the Pacific faunal regions, the body in general more slender in 

 form and always with fine elytral striae, the posterior thoracic angles 

 always sharply defined; epistomal angles with a single setigerous 

 puncture; head slightly more than half as wide as the prothorax 

 throughout IO 



4 Hind angles of the prothorax slightly obtuse and more or less narrowly 

 but distinctly rounded 5 



Hind angles slightly obtuse but always rather sharply marked, never 

 distinctly rounded 7 



5 Elytra rather densely opaque and lustreless in both sexes. Body 

 oblong-oval, much less convex than in any of the others, the head, 

 prothorax and under surface shining; head with deep and moder- 

 ately small elongate perforate foveae, the antennae rather slender, 

 blackish, the basal joint testaceous; epistoma with a single setigerous 

 puncture at each angle; prothorax one-half wider than long, the 

 sides evenly and rather strongly arcuate, the apex deeply sinuate, 



