American Caraboidea 173 



Differs from monongahelce Leng, from the same regions, in its 

 distinctly smaller size, narrower form, narrower and more elongate 

 prothorax, smaller and much narrower head and especially in the 

 still decidedly more slender anterior male tarsi. Among a large 

 series of monongahelce there were two males and two females of 

 this species. 



MonongahelcB is a fully valid species, quite different from ridingsi 

 in its more ventricose form and much deeper and coarser elytra! 

 sculpture; a specimen of ridingsi was recently given me very 

 kindly by Mr. Mann; it was taken near Washington. 



A large series of the following species has been in my collection 

 for some years under the name germari Chd., but it is a smaller 

 form, with narrower prothorax and different anterior male tarsi: 



Irichroa mutabilis n. sp. — Strongly ventricose, convex, shining, vio- 

 laceo-cupreous, varying to bronze or obscure bluish, deep black beneath; 

 head two-thirds as wide as the prothorax; last joint of the palpi variable 

 in form and size; antennae long and slender; prothorax relatively small, 

 a little longer than wide, not inflated, widest slightly before the middle, 

 where the sides are obtusely subangulate, thence very slightly converging 

 and arcuate to the broadly rounded and slightly prominent apical angles 

 and more converging and very feebly sinuate or straight to the rounded 

 basal angles, the margins abruptly reflexed; surface rather flattened, 

 punctured apically, more broadly basally and narrowly along the sides; 

 transverse impressions deep; elytra not quite one-half longer than wide, 

 two and one-half (cf) to two and three-fourths (9) wider than the 

 prothorax, the humeri rather rapidly rounding as a rule; striae coarse, 

 very deep and strongly punctured, the sixth and tenth intervals usually 

 with confused coarse punctures beyond the middle; apical slope with 

 confused punctures; anterior male tarsi coarsely punctate and pubescent 

 above, except along the middle, the first joint broader than the second, 

 the spongiose sole extending to basal third. Length (cf) 19.0-20.5. 

 (9) 21.5-23.5 mm.; width (cT) 7.9-8.3, (9) 8.8-9.7 mm. Pennsyl- 

 vania (Uniontown, on the western slope of the Appalachians), — T. M. 

 Brown. 



Differs from germari in its rather smaller size, narrower and 

 moderately though evidently elongate prothorax and less extended 

 pubescent sole of the first anterior male tarsal joint; this sole in 

 germari extends to the base of the joint. 



The following seem to be two varietal forms occurring in the 

 same region: 



Irichroa mutabilis ssp. longicollis nov. — Nearly similar to mutabilis 

 but larger, the elytra rather less convex and the coloration tending more 



