96 Mr. T. V. Wollaston on certain Colcoptera 



at St. Vincent are rather more coarsely imbricated than the 

 Madeiran and Canarian ones, and have their treble seiies of 

 metallic elytral points smaller. I consider them, however, no- 

 thing more than a mere variety of the C. Madera and Indagator 

 of Fabricius, a species w^hich is widely distributed over the va- 

 rious Atlantic islands. I have taken it throughout the whole of 

 the Madeiran group, except on the small rock of the Northern 

 Deserta ; and on Jive of the Canaries. It is also recorded in 

 Terceira and San Miguel, of the Azores : indeed, a male from 

 the former has been lately communicated by Mr. Fry, which is 

 as rough in sculpture as those from the Cape de Verdes, and has 

 its elytral impressions quite as small and obscure. Mr. Fry's 

 examples have been transmitted to me under the name of C. 

 Olivieri, Dejean ; and as such the insect is quoted in M. Morelet's 

 ' Histoire Naturelle des A9ores.' What Dejean's true C Olivieri 

 (which was described from a Bagdad specimen) may be, I have 

 no means of ascertaining ; but I cannot detect in the Cape de 

 \'erde and Azorean individuals any differential characters of 

 sufficient importance to separate them specifically from the 

 Madeiran and Canarian ones. 



Genus Chl^enius. 



Bonelli, Observat. Entom. i. tab. synopt. (1813). 



8. Chlanius Boisduvalii, Dej. 



ChlcBnius Boisduvalii, Buquet, in litt. 



, Dej., Spec. Gen. des Col. v. 625 (1831). 



Three specimens of this insect have been kindly lent me by 

 Mr. Fry, by whom they were captured at St. Vincent, " under 

 grass and beneath stones of an old wall," in the month of October. 

 They agree precisely with an example of the C. Boisduvalii (from 

 Senegal) in Mr. Bowring's collection at the British Museum, and 

 accord equally well with Dejean's description (as compared with 

 that of the nearly allied species C. ctscus), except where he states 

 that " le corselet est un peu plus etroit que celui du cacus et un 

 -pen plus retreci posterieurement." So exactly, indeed, does the 

 latter tally with the Cape de Verde species, that I am inclined 

 to suspect that the word " plus " in the diagnosis is a lapsus 

 calami, and should be read " moins," in which case the descrip- 

 tion altogether suits our present Chlcenius. According to an ex- 

 ample of the C. cacus now in my possession, for the loan of 

 which I am indebted to Mr. Waterhouse, the C. Boisduvalii dif- 

 fers in being rather smaller, a little less parallel anteriorly, and 

 more pubescent. It is also a trifle less deeply striated and more 

 finely punctured ; the punctures of its prothorax are especially 

 much less coarse, the hinder fovese of the latter are rather shorter 

 and shallower, and the margin, particularly towards the posterior 



