212 Mr. H. W. Bates on the Longicorn Coleoptera 



ciem, gratiis mihi amicissime oblatis, animo grato sponte dedi- 

 cavi. 



H. angusto-cylindricus, niger, subnitidus et fere calvus. Caput 

 sat dense et rugose punctatum ; rosti'o brevi, in medio longitudi- 

 naliter carinato necnon ad apicem ipsum pilis pallidioribus obsito. 

 Prothorax longiusculus, postice vix angustatus, paulo magis nitidus 

 sed vix parcius leviusque punctulatus, punctis versus latera densiori- 

 bus profundioribus et subconfluentibus, in disco linea laevi impunc- 

 tata longitudinali instructus. Elytra paulo magis (prsesertim pos- 

 tice) picescentia ac minus nitida, dense transversim rugulosa, sat 

 profunde subpunctato- (fere subcrenato-) striata, interstitiis minutis- 

 sime punctulatis, ad apicem integra sed ibidem parce et breviter 

 pilosa. Antennce rufo-piceae (fere piceo-ferruginese), capitulo solido, 

 obscuriore. Pedes piceo-nigri, tarsis pallidioribus ; tibiis latis, com- 

 pressis, extus fortiter spinoso-dentatis. 



The present Hylastes seems to be closely related, at first sight, 

 to the European H. ater, Payk., of which it may be regarded as 

 the Canarian representative. It is certainly, however, distinct 

 from that species, being smaller, and with the punctation much 

 finer and closer ; the longitudinal impunctate line on its pro- 

 thorax is also more evident. Like the H. ater, however, it has 

 the longitudinal keel down the middle of its rostrum well deve- 

 loped, and also two large deep impressions at the base of its 

 antennae. It appears to be distinct from all the cognate species, 

 as yet described, from more northern latitudes. 



It is found in the old Finals of Teneriffe and Palma, and 

 therefore at a high elevation above the sea. It appears to be 

 confined exclusively to the rotten wood of the Pinv^ canariensis, 

 where it may often be found in great numbers, beneath the loose 

 bark, in company with the Er emotes crassicornis, Brulle, and a 

 large (though hitherto unpublished) species of Tomicus. At the 

 Agua Mansa, in TeneriflFe, it occasionally abounds during the 

 summer months. 



Lisboa, 15 de Julho de 1861. 



XXIII. — ContribiUions to an Insect Fauna of the Amazon Valley. 

 Coleoptera : Longicornes. By H. W. Bates, Esq. 



[Continued from p. 152.] 



Genus Acanthoderes, Serv. 



Serville, Ann. Soc. Ent. Fr. iv. 29. 



Char, emend. Body oblong, more or less depressed, narrowed 



posteriorly. Head rather broad, muzzle transverse-quadrate, 



much depressed, its anterior angles distinct, front plane ; anten- 



niferous tubercles not prominent, consequently there is no con- 



