INSECTA MADERENSIA. 151 



as to project beyond the margin of the head in the form of a rounded concave prominence, which, 

 when viewed from above, it is not easy, at first sight, to separate from the sides of the upper 

 surface itself,— an arrangement which causes the lateral expansion in front of the eyes (at which 

 pomt this under-process makes its appearance) to seem larger and more irregular than it really 

 IS : — the latter {i. e. the prothorax) extremely narrowly margined at the sides and behind, long 

 and parallel, just perceptibly narrower than the elytra, and with a broad and deep elongated 

 longitudinal depression on the disk, — which however scarcely extends to either the anterior or 

 the posterior margins. Elytra pale testaceous, deeply punctate-striated, and much abbreviated 

 and transversely truncated behind, exposing the pygidium,— which, together with the apex of the 

 former, their extreme lateral margins, and sometimes even their suture, is more or less black (in 

 quite mature specimens rather deeply so, but in others merely infuscated or picescent). An- 

 tmrm ferruginous. Legs testaceous. Beneath dark ferruginous, with the underside of the head 

 and the three hinder segments of the abdomen paler. 



Of the greatest rarity,— the few specunens which I have hitherto seen having 

 been captiu-ed by myself on the Dezerta Grande, diu-ing my encampment there 

 with the Rev. R. T. Lowe at the end of May 1850. They were taken on the 

 outer canvass of my tent, — whither they had Aotvti, in company with other insects 

 (particularly the minute ArfliroUps 2nceus), in the hot sunshine, — on the high 

 ridge at the commencement of the long northern valley, immediately above the 

 precipitous gorge which constitutes the only ascent of the island from the landing- 

 place below. 



Genus 52. LYCTUS. (Tab. IY. fig, 3.) 

 Pabricius, Unt. Si/st. i. ii. 502 (1792). 



Corpus minusculum, lineari-cylindricum : capite lato ; oculis magnis prominentibus : prothorace elon- 

 gato-subquacbato, postice interdum (ut in specie Maderensi) leviter angustato et anguKs anticis 

 amphato-productis ; lateribus plus minusve crenulatis : ehjtris integris : alls amplis. Antenna 

 (IV. 3 a) breviusculae (capitis prothoracisque vix longitudine) distantes, articulis primo et 

 secundo robustis, illo majore crassiore, tertio ad nonum longitudine paulatim vix decrescentibus 

 latitudme subsequalibus, decimo et undecimo clavam magnam ovalem biarticulatam eiEcientibus 

 (articulis subsequalibus, illo subpoculiformi, hoc paulo angustiore ovato basi truncate). Labnmi 

 (IV. 3 h) amplum porrectum, antice leviter bilobum, lobis rotuudatis ct longe ciliatis. Mandi- 

 bular (IV. 3 c) validse cornese, apice incurve bidentata;. Maxilla (IV. 3 f/) biloba;: lobo externa 

 elongate, apice valde pubescenti : interna breviore recto, intus pubescenti ciliato. Palpi maxillares 

 elongati, articulis primo et secundo longitudine subsqualibus (illo flexuoso, hoc subclavato), 

 tertio paulo breviore, ultimo elongate apice plus minusve acuminate : labiales (IV. 3 e) e scapis 

 Ugulae connatis sm-gentes, articulo primo lengiusculo subflexuoso, secundo paulo breviore sub- 

 clavato, ultimo elongato apice plus minusve acuminate. Mentum semicirculare, ad sunimum 

 apicem vel integrum, vel (ut in specie nostra) leviter truncatum. Ligula subovata antice acumi- 

 nata, lobis longis teuuissimo-membranaceis aucta. Pedes parum graciles : tibiis anticis (IV. 3/) 

 apicem versus leviter dilatatis, ad apicem externum in angulum exstantem productis, ad internum 

 unco robustissimo munitis, pasterioribus (IV. 3 g) rectis gracilibus : tarsis 4-articulatis, articulis 

 primo, secundo et tertio longitudine subsequalibus (primo vix longiore, et subtus ante basin 

 leviter constricto, — ahum articulum, sc. basalem, fere simrdanti), quarto longissimo subclavato 

 unguiculis simpHcibus munito. 



