ADETUS.—PTERICHTHYA. | 109 
extend (slightly curving) as a compact stripe to about one third the length of the elytra— 
the elytral part of the vitta in A. binotatus and allies being a broken, macular line. 
Another important difference lies in the apex of the elytra, which, instead of having a 
short oblique truncature near the suture, is transversely sinuate-truncate, with each 
angle produced into a longish tooth or spine, the sutural one shorter and finer than the 
external. The thoracic vitte are continued to the head, forming a short streak or spot 
behind each eye, which, however, is not very distinct and is sometimes absent. ‘The 
mesosternum is not at all prominent, but simply arched or nearly plane. 
11. Adetus pictus. 
A. denticaude proxime affinis, differt corpore multo latiore et breviore, vittaque lata alba utrinque ab oculo 
usque fere ad medium elytrorum extensa, macula autem postmediana majore ovata haud transversa alba. 
Castaneo-fuscus, punctatus; elytris punctis paucioribus et subtilioribus, apice utrinque sinuato-truncatis et 
bidentatis ; corpore subtus utrinque linea alba a fronte usque ad coxas posticas extensa, mesosterno elevato, 
antice verticali; antennis robustis. 
Long. 4 lin. | 
Hab. British Honpvuras, Belize (Blancaneauz). 
Certainly distinct from A. denticauda, by its shorter and broader form and. the broad 
stripe of compacter and whiter tomentum which extends from the hind margin of the 
eye down the side of the thorax and the elytron nearly to the centre of the last-named. 
A further difference is the stripe of similar tomentum beneath on the sides of head, 
prothorax, and breast. An important structural difference is seen in the prominent 
mesosternum, of which the front face is vertical. 
12. Adetus excultus. 
Major, atro-fuscus, subeneus, vitta laterali utrinque ab oculo usque ad medium elytrorum, macula magna 
discoidali ovata longe pone medium, lituraque angusta transversa prope apicem, fulvis; capite thoraceque 
punctatis; elytris punctulis lineatim ordinatis, interstitiis nonnullis elevatis, apice utrinque sinuato-truncatis 
bidentatis ; corpore subtus linea fulva a fronte usque ad coxas posticas extensa, guttisque ventralibus 
lateralibus fulvis ; mesosterno elevato, antice verticali; pedibus rufo-castaneis. 
Long. 53 lin. 
Hab. Nicaracva, Chontales (Beit). 
Relatively as broad as A. pictus, but much longer; and the tomentose stripes and spots 
are tawny-ochreous instead of white, although of the same dimensions and in the same 
positions. Both species differ from A. denticauda in the postmedian spot of the elytra 
being large and ovate (lengthwise) instead of narrow and transverse, and also in the pro- 
minent and anteriorly vertical mesosternum. 
PTERICHTHYA. 
Pterichthya, Thomson, Physis, ii. p. 156; Lacordaire, Gen. Col. ix. p. 594. 
A genus scarcely distinguishable from Adetus, the differences being comparative only, 
