17. 
18. 
19. 
20. 
21. 
22. 
23. 
24. 
25. 
PTEROCYCLON. 
Prothorax unicolorous, or gradually lighter towards the extremities . 
Prothorax black, with a transverse testaceous vitta . 
Form rather robust; tubercles on the elytral declivity not approximate 
to the suture . . woe ee 
Form slender, elongate ; tubercles on 1 the declivity approximate to the 
suture. . . . se ee 
Forehead shining, strongly punctured 
Forehead subopaque, rather finely punctured. . . . 
Declivity evidently punctured, finely tuberculate along the sutur aval 
margins, its lateral margins defined and not thickened . 
Declivity subimpunctate, its sutural margins simple, its lateral margins 
broadly thickened . Loe Loe ee 
Forehead with a median elevated line and no broad impunctate area 
Forehead with a median non-elevated impunctate space, laterally with 
coarse close punctuation 2 a 
Forehead uniformly opaque and finely punctured . 
Forehead more shining in the middle, the punctuation deeper and 
closer over the angles of the mouth . . . . . . . 
Prothorax laterally margined ; elytra not narrowed apically . . 
Prothorax not laterally margined ; elytra narrowed apically . 
Antennal club obovate Lo. 
Antennal club broad-triangular, transverse Loe ee 
Forehead with a projecting horn over the mouth ; elytra not sulcate 
along the suture . 
Forehead with no projecting horn ; 
almost from the base of the suture 
elytra with a common sulcus 
Division I.* 
271 
18. 
vittatum, sp. D. 
19. 
23. 
20. 
22. 
umbrinum, sp. n. 
21. 
difficile, sp. n. 
punctifrons, sp. 0. 
consimile, sp. 1. 
glabrifrons, sp. n. 
cordatum, sp. n. 
mali, Fitch. 
25. 
jimbriaticorne, sp. n. 
lobatum, Ferr. 
ferrari, sp. n. 
Front in the female simple, without excavations, fovew, or fasciculi of curled hairs (Pterocyclon, s. str.). 
1. Pterocyclon validum. 
Corthylus validus, Ferr. Borkenk. p. 55*(g nec ?), p. 61, note 2°. 
Subelongatum, sat nitidum, parcissime pilosum, nigro-piceum, prothoracis lateribus, ventre et pedibus ferru- 
Somewhat elongate, moderately shining. 
gineo-testaceis, hic illic infuscatis ; 
medium sat evidenter punctato ; 
fronte crebre punctata, medio tuberculata ; prothorace oblongo, post 
elytris vix perspicue lineato-punctatis, declivitate oblique excavata, 
obcordata, nitida, ambitu in utroque elytro elevato sparsim piloso, 5-dentato, dentibus 1°, 2°, 3° minutis, 
acutis, magnitudine gradatim crescentibus, 4° magno, oblique truncato, 5° magno, clavato. 
Long. 4°8 millim. 
Head rufescent, the mouth blackish ; front convex, closely punctured, 
with a median impunctate line ending above the epistoma in an acute tubercle; eyes small, flat. 
Prothorax oblong, 
strongly and elliptically rounded in front, the sides not quite straight behind the 
middle ; the hind angles obtuse, the base slightly curved, with an intra-marginal impression along each 
* The male forms of which the female has not been identified are referred to one or other of the two 
divisions of this genus by comparison with allied species of analogous structure. 
