176 ~~ Brackspurn and Suarp—On some New Species and Genera of Coleoptera. 
21. Thoracic impressions well defined, . c : : . : : . gracilis. 
Thoracic impressions almost obliterated, . . : 0 . 0 - scutatus. 
22. First joint of the antenne only moderately thicker than second, and much 
shorter than joints two and three together, . F 23. 
First joint of the antennz quite double the thickness of he peal wl 
searcely shorter than joints two and three together, . 5 é . robustus.* 
23. Humeral angles rectangular, or nearly so, and quite distinct, though not pro- 
minent, : : : 5 : 0 a 0 0 : . 24, 
Humeral angles so rounded off as to be quite sifadeal 0 c ¢ 5 . oscillans. 
24, Intermediate joints of the antenne# comparatively slender, so that the club 
appears’well defined, . . 0 25. 
Intermediate joints of the antenne raft thick, so iia the mnt diese riot 
appear very distinct, . . . : : c : : : a Pfc 
25. Antenne unicolorous, . 5 A : 3 : 5 F : + 126: 
Antenne black, with the base aah : : F 5 ; : . simplex. 
26. Lobes of tarsi conspicuously pale in colour, . c : : C . tarsalis. 
Tarsi unicolorous, or nearly so, and not differing much in colour fom the 
tibie, . . 3 c e : : 4 6 : 2 : . pusillus. 
27. Punctuation of elytra of the description usual in the genus; tarsal lobes small, 28. 
Punctuation-of elytra much coarser than in most species of the genus; tarsal 
lobes of usual size, ‘ ; : 5 . : ‘ 4 : . punctipennis. 
28. Second joint of antenne longer than wide, . ; ; : 0 0 . sunilis. 
Second joint of antenne very short and beadlike, . c : c c . debilis. 
TBs 
Fam. CURCULIONIDZ. 
RHYNCOGONUS (nov. gen.). 
The «insect for which I propose this generic name has the appearance of a 
large flat Otiorhynchus, with very elongate antenne, and differs from that genus by 
the shorter rostrum, by the very elongate scape of the antennz, by the less widely 
separated hind coxze, and by the truncature of the hind tibie being broader and 
shorter, and not interrupted nor prolonged above. It would thus appear to be by 
no means really allied to any other described form, unless it be to Psomeles, which 
was unknown to Lacordaire, as it is to myself, and only imperfectly characterized. 
Elytrogonus and Elytrurus have not the otiorhynchoid form of the rostrum ; and 
Celeuthetes, which resembles Rhyncogonus in this respect, has very large scrobes. 
The rostrum’ in Rhyncogonus is only as long as it is broad; the eyes are convex 
* Only the female of this species is known. It is possible that the first jot of the male antenne 
may be less robust. 
