HYMENORUS.—POLYIDUS. 441 
deeply canaliculate and very closely and finely punctured ; legs moderately slender, stouter in the male, 
ferruginous, the first joint of the hind tarsi the length of the following joints united. 
3. Intermediate and posterior tibie curved, the former strongly and abruptly widened on the inner side 
at the apex and the latter sinuous within. The lateral lobes of the last ventral segment slightly curved, 
broad at the base, and gradually narrowing outwardly. 
Length 5 millim.; breadth 12 millim. (¢ 9.) 
Hab. Mexico, Northern Sonora (Morrison). 
Two examples. In its small size and depressed form this species resembles H. parvi- 
collis, from which it differs in its opaque surface, longer thorax, closer punctuation, 
different male characters, &c. | 
39. Hymenorus corticarioides. 
Oblong ovate, reddish-testaceous, opaque, thickly clothed with short pubescence. Head closely and finely 
punctured ; eyes (2) small and widely separated; antenne (2) short and stout, the joints not much 
widened towards their apex, testaceous; prothorax transverse, rather convex, the sides straight behind 
and rounded and narrowing in front, the hind angles rectangular, the base feebly bisinuate, the surface 
unimpressed and densely and finely punctured ; scutellum closely punctured ; elytra a little wider than 
the prothorax at the base, rather short, coarsely punctate-striate, the interstices slightly convex and finely 
and closely punctured ; legs testaceous, rather short, the first joint of the posterior tarsi not longer than 
the following joints united. 
Length 43-43 millim.; breadth 13-12 millim. ( 9.) 
Hab. Mexico, Acapulco, Colima city (Hoge). 
Two female examples. This is the smallest Central-American representative of the 
genus; it is not very nearly allied to any other species here enumerated, though perhaps 
nearest to H. pallidus. 
POLYIDUS. 
Last joint of the maxillary palpi broadly triangular, its apical side rather longer than the outer side, the 
corresponding joint of the labial pair broad; mandibles truncate at the apex; head broad, deeply sunk 
into the prothorax, almost vertical in repose ; eyes small and transverse, widely separated in both sexes ; 
antennee long and subfiliform, reaching nearly to the middle of the elytra in the male, the joints a little 
widened towards their apex in the female, 3-11 about equal in length ; prothorax twice as broad as long, 
the sides rounded and rapidly converging from the base, the base feebly bisinuate; scutellum broad, 
transversely triangular; elytra rather short, the sides a little rounded and forming a continuous line with 
the prothorax, punctate-striate ; prosternum abruptly declivous behind; mesosternum longitudinally and 
convexly raised between the intermediate coxe, its anterior face vertical ; intercoxal process moderately 
broad; legs rather short; the third and fourth joints of the anterior and intermediate and the penulti- 
mate joint of the posterior tarsi in the male, and the penultimate joint of all in the female, rather broadly 
lobed beneath ; the first joint of the hind tarsi short, shorter than the following joints united; claws 
pectinate ; body broadly ovate, convex, winged, thickly pubescent. 
This genus resembles Menes, but differs from it in its longer legs, long and more filiform 
antenne, and differently-formed mesosternum. Polyidus may be readily separated from 
all other genera of Cistelide here enumerated by the shape of the mesosternum ; in 
general form it is almost intermediate between Menes and certain Jsomira, e. g. I. obso- 
leta. The single species referred to it is from Guatemala and South-western Mexico. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 1, November 1888. 3 LL 
