I 
730 . 
HALIPLUS FERRUGINEUS. 
Order Coleoptera. Fam. Dyticidae. 
Type of the Genus, Dytiscus ferrugineus, Payk. 
Haliplus Lat., GylL, Curt. — Hoplitus, Civ .* — Cnemidotus III.— 
Dytiscus Linn., Fab., Mars. 
Antenna inserted close to the inner margin of the eyes, near 
the base of the clypeus, not longer than the thorax, slender, 
filiform, compressed, naked and 11-jointed, basal joint the 
stoutest, short; 2nd the shortest, subglobose; 3rd much longer, 
slenderer and a little clavate ; 4th shorter than the 5th, which 
is scarcely so long as the 3rd, the following slightly increasing 
in length, apical joint the longest, conical at the tip (6). 
Labrum broad, short, subelliptic, narrowed anteriorly, concave 
before and ciliated with bristles (1). 
Mandibles small, hooked and acute at the apex, ciliated internally 
(2), one with a small tooth at the centre. 
Maxilla short, the apex forming a strong claw, with a few 
curved spines below. Palpi, internal slender, biarticulate, basal 
joint a little clavate, 2nd attenuated to the apex: external rather 
short, naked and 4-jointed, 2 basal joints short, 3rd long, a little 
dilated in the middle, 4th very small, slender and conical (3). 
Mentum transverse, anterior margin bisinuated, the centre form- 
ing a slight emarginate lobe. Lip rather large and ovate. Palpi 
attached to short scapes, rather long and triarticulate, 1st and 
2nd joints stout and elongated, 3rd short slender conical (4). 
Head rather small and subovate : eyes lateral, rather prominent and 
oval. Thorax trigonate-truncate , anterior margin concave, base 
lobed in the centre : scutel none. Elytra ovate-conic, convex : 
wings ample. Metasternum dilated and forming a large plate (p), 
covering the base of the abdomen and concealing a portion of the 
hinder thighs. Legs formed for walking, anterior the shortest (5), 
hinder the longest : thighs stout, hinder longish, slender and clavate 
(A f) : tibiae, anterior short, intermediate often ciliated with long 
hairs (*) ; hinder the longest and slender, all spurred : tarsi, an- 
terior dilated a little in the males, 5 -jointed, basal joint obovate 
truncate, 2nd and 3rd shorter, Ath the smallest, ovate, 5th the long- 
est, slender and clavate, hinder longer and attenuated, basal joint 
long, the following decreasing in length, 5th scarcely so long as the 
ls£ .* claws slender and acute. 
Ferrugineus Payk. — Curt. Guide, Gen . 87, 3. 
Shining ochreous : head orange, sparingly punctured : thorax 
more yellow, punctured except on the disc, the base depressed, 
with 2 lines of punctures, the first very strong : elytra with 9 
or 10 striae of strong black punctures, largest towards the su- 
ture : the interstices with remote minute punctures ; each ely- 
tron with a piceous spot at the base, an oblique line of 3 long 
spots before and a more transverse one across the middle, form- 
ing a Z . , and a group of 3 long spots beyond them ; the suture 
and a spot near the apex piceous: metasternum punctured. 
