174 LONGICORNIA. 
4. Dectes mexicanus. (Tab. XIII. fig. 6.) 
Canidia mexicana, Thomson, Class. Long. p. 14’. 
Hab. Mexico}, Cuernavaca, Cordova, Puebla (Sallé). 
According to specimens bearing the name of this species in M. Sallé’s collection, this 
species is extremely variable in size, colour, and markings, the extreme forms being :— 
(a) robust (64—7 lines), uniform ashy grey, varied solely by fuscous tips to the antennal 
joints, elytra broad at the shoulders and tapering thence to the apex, thorax without 
inequalities except a faintly raised dorsal line; (0) less robust, narrower, sublinear, 
ashy brown, varied with dark brown and pale ashy spots, elytra with a pale ashy 
narrow fascia forming a circumflex near the middle of each elytron, thorax uneven. 
In all the varieties the apex of the scape beneath is recurved, forming a broad denti- 
form projection. 
5. Dectes spinicornis. 
D. mexicano affinis, sed magis elongatus elytrisque magis parallelis. Elongatus, subcylindricus, breviter sparsim 
setosus, griseo-fuscus, fusco piperitus, elytris utrinque versus apicem macula (antice oblique curvata) atro- 
fusca cinereo-marginata ; antennis quam corpus paullo longioribus, subtiliter pilosis, scapo infra ad apicem 
acute spinoso ante spinam fortiter sinuato; thorace cylindrico, spina laterali recta, mox pone medium sita,. 
dorso ineequali; elytris crebre punctatis, apice singulatim acute rotundatis. 
Long. 6 lin. 
Hab. Mexico (Sturm). 
Sturm, whose collection was afterwards incorporated with that of M. Sallé, had given 
the MS. name of Astynomus spinicornis to this distinct species, which appears never to: 
have been met with by M. Sallé himself or any of his correspondents. It differs from. 
D. mexicanus, besides its more cylindrical shape and the markings of the elytra, by the 
antenne being rather densely clothed to the apex with short hairs, and by the narrower 
and more acute spine of the antennal scape, which is besides preceded by a deep. 
sinuation in the under surface. 
6. Dectes balteatus. 
Dectes balteatus, Lacordaire, Gen. Col. ix. p. 775". 
Hab. Mexico, Oaxaca!, Playa Vicente (Sal/é); GuatemMata, San Ger6énimo, San Isidro. 
(Champion). 
OXATHRES. 
Oxathres, Bates, Ann. & Mag. Nat. Hist. ser. 8, xiii. p. 50 (1864). 
Of this genus, well defined by the structure of the terminal abdominal segment, four 
species have been described; but many others exist in collections. All are Tropical- 
American. 
