218 MR. WESTWOOD ON THE TENEBRIONID^ 



The other individual is scarcely 13 lines long, brassy black above, with golden green 

 elytra ; the anterior margination of the prothorax is not interrupted in the middle, as it 

 is in the larger specimen ; the two punctures on the disc are almost obsolete ; the an- 

 tennie are proportionably rather shorter, with the three terminal joints more distinct ; 

 the feet are formed as in the last-described specimen ; the elytra are much more rugose ; 

 the punctures of the striae much less regular, especially at the sides, and the space 

 between the strise very unequal and irregular'. 



Species 2. — The Odontopus costatus (Silb.Rev. Ent. Coleopt. No. 4.), which Silbermann 

 places at the head of his genus, evidently belongs to this group, and I should have accord- 

 ingly substituted his generic name for that adopted above, but that he has evidently 

 drawn his characters from the species he names violaceus, describing the terminal joint 

 of the maxillary palpi as swollen and securiform, which is not the case in Pycnocerus. 

 His P. costatus is however evidently distinct from P. Westermanni ; the corneous eleva- 

 tion in the middle of the clypeus, fulvous palpi and " cuisses unidentees de chaque cote 

 k I'extremite interieure," will at once serve to distinguish them. 



Odontopus, Silbermann. 

 Pezodontus, Dej. Cat. 



I accordingly restrict the genus Odontopus to the species which have the elytra dilated 

 and not striato-punctated, and in which the maxillary palpi are strongly securiform, 

 and in which we find a difference in the structure of the feet, the males having the two 

 anterior tibiae with two teeth at the tips : the terminal joints of the antennae are 

 distinct. 



Species 1. — To this group belongs the Tenebrio cupreus^, Fabr. Ent. Syst. i. 110. 

 (which from the description, "pedes omnino inermes," must evidently have been a female) , 

 to which as a variety is apparently to be referred the Odontopus violaceus of Silbermann, 

 Rev. Ent. i. pi. 4. The elytra of the specimens which I have seen of this insect have, 

 however, constantly been of a fine purple, without any coppery tint. The femora have 

 not the two short acute spines near the tip beneath, observable in the next species. 

 The length of this insect is 17 lines. Laporte gives the two insects as specifically 

 distinct, but with an expression of doubt. 



Species 2. Odontopus tristis. 

 0. chalybeo-ater, capite etprofhorace opacis, tenuissime punctatis, hujus marginibus laterali- 

 bus crenulatis, elytris subviridibus magis nitidis, valde etirregulariter punctatis, sutura 



' Is it possible that the Tenebrio sulcatus of Fabricius from Guinea (Ent. Syst. i. 110) can be identical with 

 the P. Westermanni ? Mr. Hope refers it to the genus Nyctobates of Guerin, but it seems to me to belong 

 to this group. It is described of the size of T. cupreiis (Odontopus violaceus, SHberm.), that is, about an inch 

 and a quarter long, with the thorax entire and the elytra striated and coppery. It is true that all the femora 

 are bidentate near the tip, but this may be a sexual character. 



5 Tab. XV. Fig. 3. 



