7 6 



APPENDIX. 



corne, to which in some other respects also it is allied. It is, how- 

 ever, abundantly distinct from that species, being not only a little 

 broader, with its antennae rather longer and less clavate, but with 

 its head (which is more rufescent), its prothorax (which is altogether 

 larger, and of a clearer testaceous hue) and its elytra (which are 

 longer, darker, and more closely and roughly punctured) shining, 

 instead of alutaceous and opake. Its abdomen, which is free from 

 the minute punctules which are traceable in that insect, is blacker 

 anteriorly, but has the hinder segments more clearly and abruptly 

 testaceous a colour which pertains likewise to the four (instead of 

 five) basal articulations of its antennae. 



Genus MEGARTHRUS. 

 (Kirby) Steph., HI. Brit. Ent. v. 330 (1832). 



Megarthrus serrula, n. sp. 



M. subovatus, fuscus, in limbo plus minus subpellucide dilutior, su 

 nitidus et praesertim in elytris brevibus valde profunde subasperato- 

 punctatus ; capite latiusculo, triangulari, antice inter oculos (parvos 

 sed valde prominentes) obtuse producto et anguste subrecurvo, in 

 fronte grosse et late subsemicirculariter impresso ; prothorace 

 profunde canaliculate, ad latera latissime subrecurvo-explanato et 

 (oculo fortiter armato) minutissime serrator, ad angulos posticos 

 excise, mox pone medium obsoletissime subangulato, et pone an- 

 gulos rotundatos anticos abrupte angulato ; scutello late triangulari 

 (nee scutiformi) ; antennis gracilibus, longiusculis, nigrescentibus, 

 ad basin piceis ; pedibus fusco-testaceis, tibiis intermediis subcur- 

 vatis. Long. corp. lin. 1-1 5. 



Habitat Gomeram, sub quisquiliis a DD. Crotch in editioribus lectus. 



Several examples of this most distinct and interesting Megarthrus 

 were taken by the Messrs. Crotch (beneath leaves and rubbish, on 

 the mountains above Hermigua) in Gomera, during their late sojourn 

 at the Canaries. In the dilated, somewhat concave edges of its 

 body, its comparatively broad outline, the structure of its small but 

 very prominent eyes, and its slightly curved intermediate tibiae (at 

 any rate of the male sex), it would seem at first sight to be almost 

 transitional between the M. longicornis and the genus Metopsia ; but 

 this is not the case in reality, for the peculiar configuration of its 

 prothorax, added to the entire (or ten-incised) margin of its forehead 

 and its total freedom from a central ocellus, will, even of themselves, 

 at once remove it from the members of that group. 



From the M. longicornis, which is so widely spread over thes 



