150 GEO. H. HORN, M. D, 



One specimen from southern Arizona, given me by Henry Edwards 

 Esq., to whom I dedicate it. 



The addition of AuUcus and Trogodendron to our fauna requires a 

 modification of the table of the genera on p. 196 of the Classification. 

 In both the above the labial and maxillary palpi have the last joint 

 broadly triangular, differing in this respect from all our genera with 

 finely granulated eyes. In Aidicns the antennal club is abruptly formed 

 of three joints, while in Trogodendron the club is very gradually foi'med 

 and may be said to begin about the sixth or seventh joint. 



The following is the amended table : 



Eyes strongly granulated, 



Antennse serrate; labial palpi alone dilated Priocera. 



Antennge with joints 9 — 11 larger. 



Last joint of labial palpi alone dilated OpIIllS. 



Last joint of all the palpi dilated TarsosteuiiSc 



Eyes finely granulated. 



Terminal joint of all the palpi broadly dilated. 



Antennae with abruptly formed, rather loose, 3-jointed club ytlllicns. 



Antennm gradually broader not abruptly clavate TrogOfleilflron. 



Terminal joint of labial palpi alone broadly dilated. 



Last joint of maxillary a little broader than the preceding. 



Antennal club more or less triangular Tricliodes. 



Last joint of maxillary palpi slender. 



Eyes feebly convex very distinctly emarginate. 



Posterior tarsi moderately broadly dilated Clerns. 



Posterior tarsi longer, scarcely dilated. (Cleron.)....Thaiiasiinus. 

 Eyes more strongly convex not emarginate. 



First joint of tarsi very short Tliaineroclei'US. 



Thanasimus does not seem sufficiently distinct from Clerus and the 

 characters of Cleronomus in the books lead to no better result. It is 

 however unknown to us in nature. It seems to me probable that, as 

 the differences between Cleronomus and Clerus are rather those of 

 facies than of character, the former may bear the same relation to the 

 latter that the American species of Aulicuf; and Trogodendron do to 

 the Australian. Thaneroclerus on the other hand has more convex 

 eyes which are really entire forming in this respect a lead toward 

 Jlydnocera (but differing in the insertion of the antennas), and also 

 through Ichnea with the Enopliini. 



nOLrlCIIOSOMA Steph. 



D. tenuiforme n.sp. — Slender elongate, dark greenish bronze, subopaque 

 above, bluish and shining beneath. Head coarsely punctured, front triangu- 

 larly impressed. Thorax a little narrower than the head, nearly twice as long 

 as wide, sides parallel the margin slightly irregular, surface moderately densely 

 punctured and with an impressed median line. Elytra a little wider than the 

 thorax, sides straight, laaiallel, narrowed at apical fourth, nearly three times 



