Horn.] i''* [Nov. .5, 



27. A. porosus Motsch . Form of baltimorensis, piceous, surface with 

 metallic lustre varying from violaceous to green. Head coarsely punctured 

 above the eyes. Thorax usually coarsely punctured along the basal and 

 apical margins, the hind angles rectangular, usually prominent. Elytra 

 strongly sinuate at apex, the strice fine, the alternate intervals usually more 

 convex and impuuctured, the flat intervals (2 — 4—6) punctured from base 

 to apex. Length .36 — .42 inch ; 9 — 10.5 mm. 



Sexual characters as in baltimorensis. 



It will be observed in this species, that those forms in which the elytral 

 intervals are decidedly alternating in convexity are females. The punctu- 

 ation of the flatter intervals varies from very fine to rather coarse, while 

 there are specimens in which the convex intervals are punctulate, but less 

 than the flat ones. By this explanation it will be easy to account for the 

 numerous synonyms. 



In recently collected specimens the fine punctures of the flat intervals 

 bear short hairs. 



I have placed Harpalus alter nans Motsch. as a probable synonym, and I 

 would have adopted this name for the species had I been absolutely certain 

 of the correctness of this course. 



Occurs from New Mexico to Oregon, following the distribution already 

 noticed in many other species. 



C — a, amaroides Group. 



Species slightly oval, Amara-\\k.e, surface glabrous and variously colored, 

 usually with slight metallic lustre. Terminal spur of anterior tibise slen- 

 der. Posterior tarsi variable. Elytra sinuate at tip, striate, dorsal punc- 

 ture distinct. 



Male. Anterior tarsi rather broadly dilated, the first four joints densely 

 pubescent beneath. Middle tarsi less dilated, the first joint entirely glabrous 

 in coenus or with slight pubescence at tip in the other two species, the 

 next three joints pubescent beneath. 



Female. Tarsi slender not pubescent beneath. Elj^tra less shining than 

 the male. 



There is but one setigerous puncture on each side of the clypeus in this 

 group. 



The species are as follows : 

 Posterior tarsi slender, the first joint fully equal to the next two. Metas- 

 ternum at sides and intercoxal process smooth. 

 Thorax scarcely wider at base than apex. First joint of middle tarsus 



(^ glabrous beneath. Species oblong 28. laetus Dej. 



Thorax broader at base, as wide as the elj^tra. First joint of middle 



tarsus .-^ pubescent at tip. Species oval 29. coenus Say. 



Posterior tarsi distinctly flattened, the first joint shorter than the next two. 

 Metasternum at sides and intercoxal process punctate. 

 Sides of thorax behind nearly parallel, hind angles rectangular. Middle 

 tarsus of male with first joint very slightly pubescent at tip, 



30. amaroides Lee. 



