188 Mr. T. Vernon Wollaston on the Euphorhia-infesting 



punctato et punctulis minutissiniis intermediis obsito ; pro- 

 thorace seriebus dorsalibus 8 — 10-punctatis, margine postico 

 late et lateral! angustissime dilutiore ; elytris laete rufo-tes- 

 taceis, vix subseriatim sat dense punctatis ; abdomiiie, prae- 

 sertim versus apicem, dilutiore ; antennis rufo-fuscis ; pedibus 

 testaceo-rufis. 

 Long. Corp. lin. 3 — 3|. 



Habitat Lanzarotam et Fuerteventuram (aut saltern ins. parvam 

 propinquam " Lobos" dictam), in caulibus Euphorbiarum putridis 

 degens. 



The present XnntJwllnus bas much the colouring and general 

 aspect of the common European X. glahratus ; but is smaller thaa 

 that insect, with its head and prothoracic series much more 

 densely punctured, with the margin (particularly the hinder one) 

 of its pronotum diluted in hue, and with its elytra, abdomen and 

 legs respectively paler. It is very rare, and (so far as I have ob- 

 served hitherto) quite peculiar to the damp, rotting Euphorbia- 

 stems — in which positions it was taken by Mr. Gray and myself 

 on the Risco at the north of Lanzarote, during January, 1858 ; as 

 well as, by myself, on the £8th of March of the following year, in 

 the little island of Lobos, off the extreme north of Fuerteven- 

 tura. 



(Sub-fam. P^DERIDES.) 



Genus DoLicAON. 



Laporte, Etud. Ent. i. 119 (1834). 



47. Dolicaon nigricollis, n. sp. 



D. apterus, subcylindricus, niger, nitidus ; capite prothoraceque 



sat parce punctatis; elytris, abdominis segmentis ultimis 



duobus antennisque testaceo-rufis ; palpis pedibusque rufo- 



testaceis. 



Mas, abdominis segmento sexto infra profunde inciso, quinto 



integro. 

 Far. j3 [an species distincta?] palporum maxillarium articulo 

 tertio vix minus incrassato, antennis versus basin vix gracili- 

 oribus, capite vix breviore, postice paulo magis rotundato. 

 Long. Corp. lin. 2| — 3h 



Habitat Lanzarotam, in truncis Euphorbiarum putridis necnon 

 sub lapidibus baud infrequens : var. /3 (adhuc unica) ad Canariam 

 solam pertinet. Species D. lllyrico affinis et fortasse vix dis- 

 tincta, sed capite prothoraceque paulo subtilius punctatis anten- 

 nisque paulo brevioribus ab illo differt. 



