CORTICOTOMUS.—AIRORA. 391 
Thorax straight at the sides, the basal margin indistinct, the lateral margins excessively 
fine; hind angles depressed, quite rounded and indistinct. Scutellum not visible. 
Elytra not margined at the base; bearing a serial punctuation which is distinct at 
the base but soon becomes excessively fine, and at the apex the minute punctures can 
scarcely be detected. Nine examples. 
Seven individuals received of this species are all very similar, but the remaining two, 
being somewhat immature, have the elytra more dilute in colour, the surface, indeed, 
in one of them is entirely testaceous. 
2. Corticotomus gracilis, sp. n. 
Angustus, cylindricus, piceus, antennis pedibusque pallide rufis, elytris plagis quatuor magnis testaceis. 
Long. 34 millim. 
Hab. Panama, Bugaba (Champion). 
Antenne, including the club, pale red. Head ferruginous, shining, closely punc- 
tured. Thorax elongate and narrow, parallel; basal and lateral margins distinct ; 
surface moderately closely and finely punctured. Elytra with four large yellow marks, 
occupying the larger part of the surface, but leaving the suture, the sides, and a band 
across the middle dark ; the sculpture is very indistinct, but the surface is not polished. 
Legs reddish-yellow. Two specimens. 
ATRORA. 
Airora, Reitter, Verh. Ver. Brinn, xiv., Abhandl. p. 18 (1876). 
Fight species are known of this genus; it is peculiar to the New World, where it 
extends from the United States. of N. America to Paraguay. 
1. Airora yucatanica, sp.n. (Tab. XIII. figg. 1; 14a, antenna.) 
Cylindrica, nigra, nitida ; capite prothoraceque fortiter punctatis ; elytris subtiliter striatis, striis sat fortiter 
punctatis, punctis elongatis, inter se sat remotis, interstitiis vix transversim convexis. 
Long. 10 millim. 
Hab. Mexico, Temax in North Yucatan (Gaumer). 
This is readily distinguished from the other species of Avrora found in our 
region by the smaller sensitive area on the joints of the club of the antenne ; it is very 
similar to the N. American A. cylindrica, but in that species the sculpture of the elytra 
is coarser and deeper, the punctures in each stria being only very slightly separated 
from one another by the short, very feebly elevated interstices. 
I have examined four examples of A. yucatanica ; the male differs from the female 
in having the large punctures on the ventral segments a little smaller, and in having 
numerous, much finer punctures mixed with the larger. 
