Horn.] 1 ' ^ [Nov. 5, 



23. A. melanopus Hald. As the preceding species is parallel with inter- 

 punctatus so is the present with agricola. The differences, other than those 

 drawn from the clypeus, are hardly of sufficient moment to be considered 

 specific, and it is worthy of note that the present and preceding species 

 differ from each other in the same manner as do 17 and 18. Length .53 — 

 .56 inch ; 13—14 mm. 



Occurs in Pennsylvania and Illinois. 



B — b, discoideus G-roup. 



Species oblong, surface shining (at least in (^'), either glabrous or with 

 very fine pubescence, variable in color and lustre. Terminal spur of an- 

 terior tibi* dilated at middle. Posterior tarsi slightly flattened, shorter 

 than the tibife, the first joint but little longer than the second, the fourth 

 emarginate. Elytra striate, tip sinuate, intervals either smooth or punctu- 

 late alternately, dorsal puncture distinct. 



Male. Anterior tarsi broadly dilated, the first four joints pubescent be- 

 neath. Middle tarsi feebly dilated, first joint glabrous, the next three feebly 

 pubescent. 



Female. Anterior and middle tarsi not dilated nor pubescent beneath. 

 Surface usually less shining. 



All the species of this group have two setigerous punctures on each side 

 of the clypeus, except nivalis. In all, the basal impressions of the thorax 

 are well marked. 



The species are as follows : 

 Clypeus with one setigerous puncture on each side. 



Color variable, elytra Q subopaque and often ferruginous with discal 



piceous space. Intervals impunetate 23. nivalis, n. sp. 



Clypeus with two setigerous punctures on each side. 



Intervals of elytra impunetate, elytra in part at least and legs testaceous. 



Thorax piceous, testaceous at the sides 24. discoideus Dej. 



Thorax entirely piceous 25, baltimorensis Say. 



Intervals of elj'tra alternately puuctulate. 



Punctulate near the apex only 26. pitychrous Lee. 



Punctulate their entire length 27. p orosus Motsch. 



23. A. nivalis, n. sp. Form oblong, moderately elongate, piceous, elytra 

 variable, either piceous or brownish-testaceous, with a darker discal space, 

 and subopaque 9- Head nearly smooth, clypeus with one setigerous 

 puncture each side. Thorax broader than long, narrowed behind, sides 

 arcuate in front, sinuate posteriorly, hind angles obtusely rectangular, disc 

 moderately convex, median line distinct, basal impressions short, deeply 

 impressed and punctured. Elytra wider than the thorax, sides subparallel 

 (J or slightly arcuate 9> apex feebly sinuate, moderately deeply striate, 

 intervals flat, surface shining J^ or subopaque 9 , dorsal puncture normal. 

 Body beneath smooth, first ventral segment punctured at middle. Legs 

 piceous. Length .£6 — .44 inch ; 9 — 11 mm. 



