INSECTA MADERENSIA. 295 



simple front-tibifB, and by its sinaUer and more cylindrical form ; secondly, from 

 Xylotenis, by (likewise) its diminutive size, by its robuster and more elongated 

 club, its unwrinkled forehead (in both sexes), and by its strongly-dentate posterior 

 tibiae ; whilst, thirdly, the structui-e of its tibiae, and its comparatively smooth 

 prothorax will, inter alia, remove it equally from CnjplialnS: In general contour 

 indeed it somewhat approaches to Cryptnrgus, but the biarticulatcd funiculus and 

 the toothed fore-tibia; of that genus are of themselves sufficient to separate it from 

 LeipaHhrum. It is needless however to trace out its affinities any further, since 

 in its tetramerous feet it recedes from all the members of the Tomlcidcs and 

 Hijlesinidce combined which have been hitherto made known. The pecuHar con- 

 formation of its anterior til)ia; (PL VI. fig. 3) however should be adcUtionally 

 noticed ; which, although not denticulated, have two most remarkable cmcks (for 

 it is difficult to express them by any term so appropriate) along their outer edge, 

 having much the appearance of recently-healed cuts, or wounds,— whilst their 

 terminal portion is lengthened out into an exceedriigly powerful, obtuse and 

 apically-subdilated lobe. So that, when (in connection with these particulars) we 

 take into consideration the subemarginated second joint of its tarsi (as though to 

 connect the present family with the foUowing one), and the singiUar tubercles 

 which three of the species described below are armed with on the anterior region 

 of theii- pronotum (and which I am inclined to suspect may in fact exist in a rudi- 

 mentary state even on the fourth also,— though, if such be the case, they must be 

 amazingly obscure, since I am not able to detect them even beneath the micro- 

 scope), we may fairly regard Leiparthrum as one of the best-defined and most 

 abnormal groups as yet enunciated in this department of the Xylophaga. 



223. Leiparthnun mandibulare, WoU. (Tab. V. fig. 9.) 

 L. cylmdricum diluto-testaceum et pilis rigidis parce vestitum, mandibulis magnis ponectis, pro- 



thorace minus amplo, tuberculis (sc. duobus mox infra apicem, necnon in disco antico septem 



vel octo minutioribus in circulum partim dispositis), obsito, elytris ragulosis obsolete substriato- 



subpunctatis, antennis pedibusque testaceis. 

 Long. Corp. lin. vix 1. 

 Habitat Maderam borealem, sub cortice arboris cujusdam in castanetis Sanctse Anna^ semel (aestate 



media a.d. 1850) repertum. 

 Insectum valde anomalum, mandibuUs porrectis ordineque tuberculorum prothoracicorum mn'abili ab 



aliis hujus generis rccedens; sed tamen in tibiarum et tarsorum quadriarticulatorum forma ilbs 



omnino congruit, et cum Leiparthro recte adnumerandum est. 



L cylindrical, slightly sbining, diluted-testaceous, and sparingly clothed with a short, thick, rigid, 

 cinereous and somewhat scaly pubescence. Head with the mandibles exceedingly large and por- 

 rected. Prothorax rather small, and beset with tolerably distinct punctures; very slightly pro- 

 duced in front, where it is armed with two small and obtuse tubercles, placed close together 

 immediately within the centre of the anterior margin, and behind them (reaching to about the 



