OF TROPICAL AFRICA. 221 



Banksian cabinet as an inhabitant of Equinoctial Africa, is given by Mr. Hope (Col 

 Man. iii. 74) as a species of Helops. i >. "i- 



Helops cyanipes, Fab. Syst. Ei. i. 158, described from Sehestedt's cabinet as a native 

 of Guinea, is given by Mr. Hope (Col. Man. iii. 76) as a species of Amarygmus. 



Helops dentatus. Fab. Syst. El. i. p. 160. described from Lund's cabinet as a native 

 o Guinea, is given by Mr. Hope (Col. Man. p. 7.5) as a doubtful species of Opatrinus, 

 whilst at p. 136 he states that M. Westermann assured him that it was the type of a 

 new genus, closely allied to Nyctohates, but distinct. The Fabrician description is too 



metioL'" "" '° ^''^^' '*'' '^'"''' ^"' "'' ^"'"'^'' '"''"°'" ''^''' "'■^ ^^P^^i^liy 



Helops sinuatus, Fab. Syst. El. i. p. 160, described from Sehestedt's collection, is closely 

 aUied to, if not identical with, my Nyctohates confusus. 



Helops longipes, Fab., is the type of Dejean's genus Eupezus, which comprises several 

 species. 



Helops striatus, Fab., is given by Mr. Hope as a native of Guinea (Col Man iii 

 p. 75), but Fabricius states the Cape of Good Hope to be its locality : see Ent. Syst App 

 vol. IV. p. 440, where it was first described under the name of H. marginatus, which 

 name was changed m consequence of Fabricius having described another African species 

 under that name. ^ 



Tenebrio chalyb^us (Linn. Syst. Nat. ii. 674, andFabr. Ent. Syst. i. p. 1 11) is referred 

 by Fabricius (Syst. Eleuth. i. p. 156) to Helops ca^ruleus, with the observation " vix 

 differt. Linn^us however (who as well as Fabricius gives it as a native of Guinea) 

 observes, statura omnino T. ruoUtoris, colore tantum diversum," which renders the 

 correctness of the subsequent Fabrician reference of it to cceruleus as doubtful. 



Genus Calostega, genus novum. 

 Corpus magnum, oblongum. Caput mediocre, clypeo margine antico recto, angulis an- 

 ticis vald^ productis, basin labri recipientibus. Antenna crasss, breves, articulis 

 7-10 pr^cedentibus majoribus, ultimo majori, apice subacuto. Mandibulce ad 

 apicem bidentat^ denteque altero majori in vel versus medium marginis interni 

 armatce. Maxilla lobo interno in dentem corneum obtusum hamatum terminato 

 Palpi maxdlares articulo ultimo securiformi. Mentum latum, lateribus rotundatis' 

 basi value constrictum. Labium quadratum. Palpi labiales articulo ultimo ovali' 

 Prothoracc subquadratus, antice paullo latior, lateribus versus angulos anticos ser- 

 ratis. Elytra oblongo-ovalia, laevia, metalli-colorata. Pedes crassi, femoribus om- 

 nibus ante apicem bispinosis ; tibiis omnibus intus anteet pone medium sinuatis. 

 This type of form seems to be intermediate between Pycnocerus and Odontopus 

 whilst in the structure of its trophi it more resembles the species of the second section 

 of Pnoscelis. I think it not improbable, when we obtain a perfect knowledge of all the 



VOL. III. PART II. 2 G 



