Oct—Dec., 1919 Bulletin of Brooklyn Entomological Society 1385 
This species is distinguished by its small size, slender dark- 
colored antennz with long parallel-sided terminal joint, strong 
infra-lateral carinz, and rather narrow thorax. 
Bolitochara marginella Csy. (5). 
Gyrophaena lobata Csy. (3). 
Gyrophaena vinula Er. (1). 
Myllaena vulpina Brnh. (4). 
Acylophorus pronus Er. (1). 
Staphylinus cinnamopterus Grav. (1). 
Philonthus palliatus Grav. (1). 
Philonthus quadricollis Horn. (1). 
Philonthus fulvipes Fabr. (2). 
Philonthus lomatus Er. (2). 
Philonthus opacipennis n. sp. 
Form moderately elongate, slightly fusiform. Color black; terminal 
segment of the abdomen yellowish diaphanous; terminal joint of the an- 
tenne, palpi and legs dark brownish piceous. Head oval, one fourth 
longer than wide, sides almost evenly rounded from the eyes to the neck; 
eyes small, distant from the base one and one third their diameters; an- 
tennz moderately slender, longer than the head and thorax, second and 
third joints equal, twice as long as wide; the outer joints decreasing grad- 
ually in length, eight, nine and ten as long as wide, eleven one third longer 
than wide and obliquely truncate at apex; a few punctures on the sides 
above and behind the eyes. Thorax as long as wide; base strongly rounded, 
sides nearly straight and distinctly converging anteriorly; apex as wide as 
the head; dorsal series of punctures five, equally spaced in straight rows. 
Elytra as wide as the thorax at base, about one fourth wider at apex, con- 
jointly slightly transverse; suture equal in length to the thorax, apex dis- 
tinctly emarginate; scutellum slightly more than one third the length of 
the suture; distinctly alutaceous and subopaque, punctures asperate, fine, 
rather sparse; pubescence fine and dark, inconspicuous. Punctures of the 
abdomen asperate, slightly coarser and distinctly denser than those of the 
elytra. First joint of the posterior tarsi somewhat shorter than the next 
three, slightly longer than the fifth. 
Length 5 mm.; width 1.25 mm. I 9. 
Male,—unknown. © 
Female,—anterior tarsi scarcely dilated; last ventral segment broadly 
rounded. 
This species probably belongs in section C of Horn’s synopsis. 
Its color and antennal structure would indicate a relationship 
with P. arigonensis Horn. The alutaceous and sparsely punctate 
