APPENDIX. 75 



Thus, it is not only a trifle smaller, narrower, and perhaps somewhat 

 less black, than the bilineatus, with its punctation a little finer, its 

 elytra not qnite so developed, and its limbs appreciably paler (?), but 

 its eyes are considerably larger extending to the very base of the 

 head (and having, therefore, no decided orbit behind them), and oc- 

 cupying, as Mr. Rye well expressed it, " the whole temporal area." 



Trogophlceus exilis, 



T. angustus, niger, subnitidus, densissime subtilissimeque cinereo- 

 sericeus ; capite prothoraceque minutissime, creberrime et sequa- 

 liter subpunctulatis (primo visu quasi grosse subalutaceis), hoc in 

 disco postico obsolete longitudinaliter biimpresso ; elytris longi- 

 usculis, sensim picescentioribus, creberrime sed paulo argutius 

 punctulatis ; antennis ad basin obscure dilutioribus ; pedibus 

 saturate testaceis. Long. corp. lin. -. 



Trogophheus exilis, Woll, Ann. Nat. Hist. vi. 105 (1860). 

 Habitat Maderam, Teneriffam et Gomeram, in humidis rarissimus. 



Genus HOMALIUM. 

 Gravenhorst, Col. Micropt. 116 (1802). 



Homalium tricolor, n. sp. 



H. nitidulum abdomine subopaco ; capite rufo-ferrugineo, antice in 

 medio nigrescentiore ; prothorace rufo-testaceo, amplo, punctis 

 perpaucis irregulariter irrorato, in disco postico longitudinaliter 

 bifoveolato ; elytris longiusculis, nigro-fuscis ad humeros magis 

 testaceis, crebre et profunde ruguloso-punctatis ; abdomine alutaceo 

 (sed haud punctato), nigro segmentis 3 ultimis rufo-testaceis ; 

 antennis nigris, articulis 4 basalibus pedibusque laate rufo-testa- 

 ceis. Long. corp. lin. 1^. 



Habitat Maderam borealem, a Dom. Bewicke in Euphorbia quadam 

 emortua semel repertum. 



Obs. Species H. clavicorni affinis, sed difFert praecipue capite 

 (rufescentiore), prothorace (majore) elytrisque (longioribus, nigres- 

 centioribus, densius rugosiusque punctatis) nitidiusculis (nee opacis 

 alutaceis), abdomine antice nigrescentiore, postice laetius et abrupte 

 rufo-testaceo, hand punctato, necnon antennis paulo longioribus 

 minusque clavatis, articulis 4 (nee 5) basalibus laete et abrupte 

 rufo-testaceis. 



Of this beautiful Homalium a single example was captured by the 

 late Mr. Bewicke in the north of Madeira proper, from under the 

 bark of a rotten Euphorbia in the Bibeira de Sao Jorge. It would 

 appear consequently to have much the same habits as the H. clavi- 



