458 



CANARIAN COLEOPTERA. 



costso (the inner one of which is less raised than the others) down 

 each. One of my specimens, however, is comparatively shining, and 

 has its elytral granules less distinct ; but whether this is due to va- 

 riation, or is merely a sexual peculiarity, I am unable to state. It 

 would appear to be the rarest of all the species hitherto detected, 

 the only examples which I have seen (five in number) having been 

 captured by myself on the ascent to the Roca del Soucilho, above San 

 Mateo, in Grand Canary, during the spring of 1858. 



695. Hegeter impressus. 



H. praecedenti similis, sed minus opacus, capitis prothoracisque punc- 

 tulis sensim evidcntioribus (sed tamen subtilissimis, ajgre obser- 

 vandis); elytris singulis obsolete 3-costatis, minutius grauulatis, 

 et transversim irregulariter, sed valde, rimoso-corrugatis (vel -im- 

 pressis). 



Variat (praecipue in regionibus australibus) paulo convexior angus- 

 tior nitidior, elytris minus evidenter granulatis et costis magis nu- 

 merosis (i. e. alternis minus certe obsoletis) sed omnibus valde in- 

 distinctis (interdum vix discernendis) longitudinaliter instructis. — 

 Long. corp. lin. 3|-vix 5. 



Hegeter impressus, Brulle, in Webh et Berth. {Col.) 64 (1838). 



Habitat Canariam Grandem, sub lapidibus vulgaris. 



The present Hegeter, which seems to be almost universal in Grand 

 Canary, and which abounds throughout the region of El Monte, is 

 evidently nearly allied to the preceding one, whose elyti'al pecu- 

 liarities, of minute granules and thi'ce longitudinal costse, it possesses, 

 but to a less extent — the diminution in degree being, as it were, 

 compensated for by the addition of a transversely crumpled (or cor- 

 rugated) sui'face. This last feature, which varies somewhat in in- 

 tensity, is generally very conspicuous, being of itself sufficient to dis- 

 tinguish the species. The H. impressus is a little less opake than 

 the costipennis ; and the punctules of its head and prothorax, although 

 excessively minute, are traceable — which is scarcely the case in its 

 ally, except when viewed beneath the microscope. In certain dis- 

 tricts, particularly towards the south and centre of the island (as at 

 Arguiniguin and above San Bartolome), it is a httle narrower, con- 

 vexer, and more shining ; and its elytra are less evidently granuled, 

 and have their obscure costae (although perhaps stUl less apparent) 

 rather more numerous, — the intermediate ones, which are obsolete in 

 the normal specimens (and in the H. costipennis), being (however 

 faint) as distinct as the remainder. But the two forms pass into 

 each other by imperceptible gradations. 



