H. C. FALL 415 



identity of this species, and shows that the infaustus of Halde- 

 man is completely sj'nonymous. 



Several species in the vicinity of ato/narius are easily confused 

 with it, and the following additional tabular statement is offered 

 as a further guide to the student. Although .stygicus is tabulated 

 with the black species it is really closeh' allied to atomarius, and 

 is therefore included here. 



Eyes not at all prominent, prothorax rather shorter and less narrowed in front, 

 the sides if produced passing tangent to the eyes or scarcely intersecting them; 

 basal joint of antennae more or less pale beneath, at least in the cf : pyKidiiim 



without pale spots atomarius 



Eyes a little prominent — most noticeably so in cephalicus, the j^rothorax 

 slightly longer and more narrowed in front, the sides if produced intersecting 

 the ej-es; basal antennal joint black or piceous with at most the tip only nubi- 

 lously paler. 



Antennae more slender, the tenth joint in the cf three to four times as long 



as wide; pygidium with subapical yellow spots more or less developed. 



Tenth antennal joint of cf about three times as long as wide, eyes less 



prominent, sides and apex of elytra more distinctly striate . . . obfuscatus 



Tenth antennal joint of cf nearly or quite four times as long as wide, 



eyes more prominent, elji^ral punctuation more broadly confused, hind 



tibiae pale in apical half (more or less) cephalicus 



Antennae less slender, the tenth joint in the cf about two and one-half 

 times as long as wide, and in the 9 but little more than twice as long as 

 wide; hind tibiae entirely black or piceous, pygidium without spots (rarely 

 obscurely indicated in vestigialis) . 



Elytral punctuation very dense and confused almost throughout, even 

 the lateral striae in great part broken up; cokjr varying from entirely 



black to thickly speckled with yellow vestigialis 



Elj1:ral punctures less dense, several striae — usually three, four, seven and 

 eight — well defined and entire or subentire; color entirely black or with a 

 few very small scattered 3'ellow flecks on the elytra^ stygicus 



9G. Pachybrachys vestigialis new species 



\'er\- close to, and possibly not distinct from atomarius. It varies in color 

 from ahnost entirely black (typical) to the usual confusedly mottled form so 

 frecjuent in atomarius. In the type the head has two small obscure yellow 

 spots on the vertex, two or three others very small and barely discernible on 

 the prothorax, and on the elytra a few small brighter yellow spots along the 

 base and in an irregular transverse line behind the middle, of which the bright 

 yellow dot-like shield is the most conspicuous; middle and hind thighs with a 

 small yellow apical si)Ot. In another example the shield is dimly visible, the 

 other pale spots nearly or quite obliterated, the head, ])rothorax and legs en- 

 tirely black. The basal joint of the antennae is entirely black, second joint 



= Rarely with the yellow sjiots more numerous. 



TR.\XS. .\M. EXT. SOC, XLI. 



