LUDIITS.— OETHOSTETHUS. 507 



12. Ludius meridanus, 



Aphanobius meridanus, Pilate, in litt. 



Moderately elongate, broad, the male narrower, robust, slightly shining ; rufo- or piceo-eastaneous, the antennae 

 and legs ferruginous or flavo-ferruginous ; above and beneath rather sparsely clothed with short, 

 decumbent, yellowish-brown pubescence. Head closely, coarsely punctate, slightly depressed along the 

 middle of the front in the male; antennae extending to considerably beyond the hind angles of the 

 prothorax in the male, shorter in the female, the joints from the fourth moderately dilated and serrate, 

 3 short, slightly longer than 2, the two together in the male shorter than 4, 11 appendiculate. Prothorax 

 convex, a little broader than long, more transverse in the female, the sides almost straight, and very 

 gradually converging to near the apex, and rounded in front, in the male, more rounded in the female, 

 the anterior portion of the marginal carina not visible from above ; the hind angles long, not divergent, 

 sharply, obliquely carrinate ; the surface thickly, coarsely punctate, canaliculate behind. Elytra nearly 

 three times the length of the prothorax, a little rounded at the sides, narrowing from about the middle, 

 the apices narrow and conjointly rounded ; finely punctate-striate, the interstices almost flat, rugulose, 

 and thickly punctured, slightly granulate towards the base in the male. Beneath finely and rather 

 sparsely, the prosternum very coarsely, punctate ; intercoxal portion of the presternum flat, the process 

 abruptly, perpendicularly declivous a little behind the coxae, and horizontally extended thence to the 

 ante-apieal tooth ; intercoxal portion of the mesosternum V-shaped, angularly raised on either side 

 anteriorly ; posterior coxal plates moderately widened in their inner third. 



Length 14-17|, breadth 4J-6| millim. ( d 5 •) 



Hab. Mexico, Yucatan (Pilate, in coll. Janson). 



One pair, the female being very much larger and broader than the male ; the latter 

 is labelled with the name I have adopted. In the sternal characters this species 

 agrees with L. setosus, from which it differs in the less dilated antennae in both sexes, 

 the joints being much less acutely serrate in the male ; it is also less elongate than 

 that insect, and the female has more parallel elytra. More convex than L. rubicunolus, 

 Cand., the prosternal process differently formed, the elytra more finely punctate- 

 striate, &c. 



ORTHOSTETHUS. 



Aphanobius, Germar, Zeitschr. fur Ent. v. p. 183 (1844) (part.); Leconte, Trans. Am. Phil. Soc. 



new ser. x. p. 492 (nee Eschscholtz) . 

 Orthostethus, Lacordaire, Gen. Col. iv. p. 207 (1857); Candeze, Monogr. Elat. iv. p. 313. 



An American genus containing a few species of large size, all of which occur within 



L. texanus in the Janson collection. As this insect is certain to be confused with L. setosus, it is advisable to 

 point out the differences, and propose a name for the species. 



Ludius peninsularis, sp. n. 



Closely allied to L. setosus, and differing as follows :— The third joint of the antenna? relatively longer, in some 

 specimens twice as long as the second/the two together much shorter than 4; the elytra more flattened 

 on the disc posteriorly; the intercoxal portion of the prosternum concave, the process abruptly and 

 perpendicularly declivous at a little before the middle (forming an acute tooth, if viewed in profile), and 

 horizontally extended thence to the ante-apical tooth. Length 16-18 millim. ( rf $ •) 

 Dr. Horn informs me that he possesses examples of this species from Cape San Lucas, Lower California, one 



of which he has kindly forwarded ; it is probable that those in the Janson coUection are from the same region. 



3T2 



