422. . 
ARCOPAGUS PUNCTICOLLIS. 
Order Coleoptera. Fam. Pselaphidas. 
Type of the Genus , Pselaphus bulbifer Reich. 
Arcopagus j Lea., Den., Curt. — Pselaphus Reich., Panz. 
Anlennce inserted on each side the head before the eyes, straight, 
as long as the thorax, hairy and 1 1 -jointed, basal joint very ro- 
bust, dilated and acuminated on the internal angle in the males 
(6(J), long stout and subovate in the females, 2nd joint much 
larger than the 7 following, subglobose and acuminated inters 
nally in the males, ovate in the females, 3rd obovate, five fol- 
lowing moniliform, 9th larger transverse, J Oth as large as the 
2nd, somewhat cup-shaped, 1 1th very large and conical (6 $). 
Lahrum subtrigonate, anterior angles rounded and producing a 
few bristles, with 2 minute tubercles in the centre (1). 
Mandibles subtrigonate, acute, rounded externally, with 2 small 
teeth beneath the apex (2), 
Maxillce minute, base suborbicular, terminated by 2 lobes ciliated 
with bristles, the superior one the longest. Palpi very long and 
large, 4-join ted, basal joint minute, 2nd very long clavate, 3rd 
short oblong, 4th as long as the 2nd very large, ovate-securiform, 
very narrow at the base and pubescent (3). 
Mentum subquadrate, the angles rounded. Palpi arising near 
the centre of the anterior margin, biarticulate, basal joint linear 
and the longest with a bristle at the apex, 2nd forming a claw. 
Labium divided into 2 rounded divaricating lobes with a few hairs 
on the inside (4). 
Head long and narrowed before , broad at the base . Eyes small lateral 
and remote. Thorax subglobose-ovate, truncated at the base. Scu- 
teilum very minute. Wings none. Elytra semi-oval, twice as broad 
as the thorax and covering two thirds of the Abdomen which is ovate- 
conic. Thighs a little thickened. Tibiae rather longer, slender at the 
base and attenuated towards the apex , anterior notched internally in 
the males (5 (J). Tarsi inarticulate, basal joint minute, 2nd long 
and rather stout, 3rd a little shorter and more slender, terminated by 
a single Claw (5 9, fore leg). 
Puncti colli s Denny's Mon. p. 26. 3. — Curt. Guide , Gen. 234. 3. 
Ferruginous shining, coarsely but rather sparingly punctured : 
head elongated and produced considerably beyond the eyes, 
which are black, and between them are 2 fovese. Thorax much 
broader than the head, narrowed at the base, with an obscure 
transverse line terminating in a fovea at each angle. Elytra 
piceous, very coarsely punctured, with a few depressed hairs, a 
channel on each side the suture and an excavation near each 
shoulder. Abdomen finely punctured. Thighs very thick in the 
males. 
In the Author's and other Cabinets. 
