44 CANARIAN COLEOPTERA, 



The 0. glahratus is very closely allied to the 0. inaderensis, which 

 abounds on the mountains of Madeira ; but I believe, nevertheless, 

 that it is truly distinct. It differs in being a little more shining ; 

 in having its prothorax a trifle larger, rather more produced in the 

 centre behind (in front of the scutellum), and with the sides and 

 base comparatively impunctured ; and in its elytra being rather 

 more oblong (or straighter at the edges and a little acuter at the 

 shoixlders), just perceptibly less convex, more deeply striated, with 

 theii' interstices more evidently punctulated and imalutaceous (even 

 beneath the microscope), and with their suture (except occasmmlly 

 the hinder portion) not paler than the disk. 



72. Olisthopiis elongatus. 



Olisthopus elongatus, Wall, Ins. Mad. 38 (1854). 



, Id, Cat. Mad. Col. 14 (1857). 



glabratus, Hartxmq \i\ec Bridlf\, Gedloq. VerhdUn. Lanz. utid 



Fuert. 140 et 141. 



HaUtat in Lanzarota et Fuerteventura, ubique sat vulgaris. 

 The 0. elongatus (which occurs in Madeira and Porto Santo) is 

 rather common throughout Lanzarote and Fuerteventura, — where it 

 was captured by Mr. Gray and myself in January 1858, and sub- 

 sequently (by myself) during the spring of the following year ; and 

 where it would seem to take the place of the 0. glahratus, which is 

 all hut universal in the remaining islands of the Canarian archi- 

 pelago. I have not the slightest hesitation in regarding it as the 

 Olisthopus referred in M. Hartung's catalogue to the glahratus of 

 Brulle, — first, because the latter does not appear to exist in either 

 Lanzarote or Fuerteventura (in hotli of which islands he implies his 

 species to have been found) ; and, secondly, because, of the five 

 specimens communicated to me by Dr. Heer under the name of 

 " glahratus,^' as Lanzarotan examples and collected by M. Hartung, 

 no less than four were the elongatus. That the soKtary 0. glahratus, 

 included amongst them, was from TenerifFe, and accidentally mixed 

 up (afterwards) with the others, I have already recorded my con- 

 viction in the foot-note on the preceding page. 



had not myself visited the Canaries when I published my Madeiran Catalogue, 

 in 1857, I was of course imaware that the 0. gluhrafns does not occur in the 

 two eastern islands of the Canarian group, and I consequently mentioned in a 

 foot-note {^vidc p. 12) that I had received a Lanzarotan example of that insect 

 from Professor Heer. I woidd wish, therefore, now to correct this error (for I am 

 perfectly satisfied that such it is) ; since it is an important fact, to]:)Ograpliieally, 

 that a species so general as the 0. glahrafioi is in the central and western portions 

 of the archipelago should be replaced in Lanzarote and Fuerteventura by the 

 Madeiran dongatui (which has not yet been observed elsewhere at the Canaries). 



