144 Mr. T. Vernon Wollaston on the Euphorbia-infesting 



striatis ; anteiinis pedibusque piceis, illis brevlbus, articulls 

 ultimis tribus majoribus, intus ferrugineis serratis, clavam 

 abruptara efficientibas. 

 Long. Corp. lin. 3 — 4^. 



Habitat in Lanzarotd, Teneiiffa et Hierro, intra caules Euphor- 

 biarum madidos latens. 



Tlie present distinct Trogosita appears, so far as I have hitherto 

 observed, to be peculiar to the decayed Euphorbia-stems of tlie 

 Canaries, — where it was first captured by Mr. Gray and myself, 

 during January, 1858, on the Risco, above the Salinas, in the 

 north of Lanzarote. I subsequently took it, in similar positions, 

 at El Golfo, on the west of Hierro; and at Taganana, in the 

 north of Teneriffe. It would seem to be very rare, occurring in 

 the moistest and most rotten parts of the Euphorbias, — beneath 

 the loose outer fibre towards the lower portions of the stems (and 

 even of the roots), which come in direct contact with (and are 

 often buried in) the damp earth. It varies considerably in size ; 

 and is rather more black, parallel and opaque than the common 

 T, mauritanica, its prothorax is more quadrate and remotely 

 punctured, and with its extreme angles less produced, its elytra 

 are very much more deeply punctate-striated, and its antennae are 

 shorter, and with their three apical joints internally enlarged (or 

 serrated) into an abrupt club, after the fashion of the Madeiran 

 T. serrata, — to which indeed, although conspicuously distinct 

 from it, it is much more nearly allied. 



3. Trogosita recta,* n. sp. 



T. elongata, subdepressa, piceo-fusca, subopaca ; capita protho- 

 raceque profunde sed baud dense oblongo-punctatis, hoc ad 

 latera oblique recto, angulis anticis porrectis, angulis ipsis- 

 simis posticis exstantibus ; elytris fusiformi-parallelis, pro- 

 funda cranato-striatis, 



Long. Corp. lin. 3. 



Habitat Lanzarotam borealem, in trunco quodam Euphorbias 

 samel capta. 



Though certainly distinct from it, the present Trogosita is very 

 closely related to the M;ideiran T. serrata. It is, however, a 

 little darker and less parallel than that insect (its prothorax being 

 a little wider in front, and the elytra a little more evidently di- 

 lated behind the middle) ; its prothorax is not quite so densely 

 punctured, more coarsely margined, and straighter (though oblique) 

 at the sides — with its anterior angles more porrected, and its 



