Mr. T. V. Wollaston on Madeiran Coleoptera. 407 



have the vascular bundles lying in the cambium-cylinder sepa- 

 rated by very broad medullary rays. If we trace, for instance, the 

 development of the stem of an Impatiens, we see that the cells of 

 the medullary rays produced by the development of the cambium- 

 ring become converted more and more into prosenchymatous 

 cells, and that between them appear groups of vessels (but 

 without spiral vessels), thus giving origin to new vascular bun- 

 dles. Hartig* observed vascular bundles developed in the above- 

 described secondary cambium-layer which appears in the medulla 

 of Cucurbita. 



XLI. — On Additions to the Madeiran Coleoptera. 

 By T. Vernon Wollaston, M.A., F.L.S. 



Fam. Carabidae. 



Genus Olisthopus, Dej. 



Olisthopus humerosus, n. sp. 



Olisthopus maderensis, var. fi, Woll. Ins. Mad. 35 (1854). 

 humerosus, Schaum, in litt. 



It is not without some little hesitation that I am induced to 

 register the present insect as specifically distinct from the O. 

 maderensis, of which I have hitherto regarded it as an insular 

 modification (although certainly a very curious one) peculiar to 

 the rocks of the Dezertas. And I may add that it is through 

 the strongly expressed opinion of my friend Dr. Schaum of 

 Berlin, who has stated his belief that the peculiarities which it 

 exhibits are too great to be attributed to any combination of the 

 local influences to which it may have been long exposed, that I 

 now record it under the new trivial name which he has suggested, 

 — a title indicative of a character about its shoulders, which are 

 a trifle more produced (and angular) than those of the 0. made- 

 rensis. The other points in which it recedes from its ally may 

 be at once gathered by a reference to the ' Insecta Maderensia/ 



Genus Stenolophus, Meg. 



Stenolophus marginatus. 



Stenolophus marginatus, Dej. Spec. gen. des Col. iv. 427 (1829). 

 , Leon Fairm. Faun. Ent. Franc, i. 145 (1854). 



Two Madeiran specimens of this insect have lately come 

 under my notice ; they were both captured near Funchal, one 

 by Mr. M. Park, and the other by Mr. E. Leacock. The species 



* Bot. Zeitung, 1854, p. 31. 



28* 



