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03 . 
ACILIUS CALIGINOSUS. 
Order Coleoptera. Fam. Dyticidae Leach . I Iy tiro can- 
thari Lat. 
Type of the Genus Dytiscus sulcatus Linn. 
Acilius Leach. Dytiscus Linn., Fab., Gyll. Dyticus Geoff., Lat. 
Antennce inserted close to the eyes, at the base of the mandibles, 
smooth, filiform, 11 -jointed, 2nd joint short, 3rd long clavate, 
the following clavate, decreasing in length to the terminal joint, 
which is slightly curved (fig. 6). 
Lahrum naked, transverse, slightly emarginate ( 1 ) . 
Mandibles small, bent, broad and bifid at the apex (2). 
Maxillce small, bent, acute, ciliated internally : Palpi ; internal 
attenuated, 2-jointed, 1st joint small, 2nd long, curved j exter- 
nal 4-jointed, 1st joint minute, 2nd and 3rd slightly clavate, 4th 
large, longer than the 3rd, attenuated, rounded at the apex (3). 
Mentum transverse, slightly lobed at the sides : Palpi 3 -jointed, 
attached to a cup-shaped scape, 1st joint short, 2nd and 3rd long, 
the latter somewhat clavate : Labium large, rounded, ciliated (4) . 
Head somewhat small , rounded. Thorax transverse , broad. Elytra 
depressed, ovate, narrow at the base, smooth in the males , sulcated 
and hairy in the females. Wings 2. Scutellum distinct. Tibiae 
all short. Tarsi 5 -jointed, anterior, patelliform in the males, the 
first 3 joints being dilated , ciliated, with suckers beneath. Claws 
simple, the internal one being the longest (5). Posterior tarsi com- 
pressed, elongated, ciliated on both sides with very long hairs, one 
claw very minute (5*). 
Caliginosus Nobis. 
Male smooth, minutely punctured. Head smooth, black, ante- 
rior part and a transverse line between the eyes dull reddish- 
ochraceous. Thorax black, with the margins, and a transverse 
line in the middle dilated at the ends, ochraceous. Elytra ochra- 
ceous, pubescent, with 3 obscure lines on each, minutely punc- 
tured with black, edges of the suture and margin near the apex 
unspotted ; beneath piceous black, the sternum, margins of tho- 
rax and spots down the sides of the abdomen ochraceous. An- 
tennas and thighs pale and dull ochraceous, tibiae and tarsi ferru- 
ginous, clouded with black. — Female : Elytra with 5 elevated 
longitudinal lines on each, the intermediate surface villose. Ab- 
domen beneath dull ochraceous. 
In the Cabinets of Mr. Chant , Mr. Bentley , and the Author. 
