26 INSECTA MADERENSIA. 



large ocellated impressions) always, and the shoulders and suture occasionally, more or less pale. 

 ATitenn<2 and legs slender, but not very long, and exceedingly pale testaceous. 

 Var. jS. a little larger and darker. (The state peculiar to the Dczerta Grande.) 



An extremely rare insect, and known at once from the other Zargi here de- 

 scribed by its comparatively small size, by its shining, yollowish-bro^^Tl and iiTegn- 

 larlv clouded sui-face, by its niiuutc, narrow, and snl)quacbate prothorax, wliieh 

 has the margins broadly and distinctly pale, and by its elytra being imiformly 

 striated, and free from the pitted appearance which is so evident in the Z.Schanmii, 

 and is indicated, thovigh more obscurely, in the last species also. It would seem 

 to be of the greatest rarity, the only four specimens which have as yet come beneath 

 my observation ha\dng been captured l)y myself, — two in Madeira proper, amongst 

 small stones and vegetation at the base of the damp perpendicular rocks about 

 half-way up the Ribeu'o de Santa Luzia, dvu-iug the early spring ; and two on the 

 Dczerta Grande, from out of the cracks of the exposed weather-beaten eminences 

 of red volcanic soU (so well known to all who have landed on the island by their 

 loose rotten struct m'c, and worn, rounded forms) at the extreme head of the great 

 northern valley, dm-ing January 1849. 



(Div. 2. PTEROSTICIilDEA.) 

 Genus 10. PRISTONYCHUS. 



Dejean, Species des Col. iii. 43 (1828). 



Corpus sat magnum, elongato-ovatum, depressiusculum : prothorace subcordato : alis (in typicis 

 obsoletis, sed in specie Maderensi) amplissimis. Antenna filiibrmes, capite prothoraceque paulo 

 longiores, articulo primo sequentibus robustiore, sccundo brcv-i. Labrum quadi-atum, antice 

 leviter emarginatum et setis paucis longissimis instructum, angulis anticis rotundatis ciUatis. 

 Mandibidm incurvoe acutie, intus basi denticulatre. Maxilla bilobse : loho extenw palj)iformi 

 biarticulato : internn acuto incurvo, apice uncinato, intus valde eiliato. Palpi iililbrmes, articulo 

 ultimo fusifornii-truncato. Mcnium transversum, antice profunde emarginatum et dente medio 

 brevi bifido instructum. Ligida cornea, apice truncata pihsque duobus longissimis aucta : para- 

 fflossis mcmbranaceis linearibus, earn longe superantibus. Pedes longi, graciles : tarsis anticis in 

 maribus articulis primo, sccundo et tertio leviter dilatatis, triangularibus et subtus biseriato- 

 setosis : unguiculis basi leviter serratis. 



Pristoiii/c/iKS in nearly all piu'cly structural points is coincident with CaUdhus, 

 its more elongated paraglossic, which are linear, and stretch out to a considerable 

 distance beyond the apex of its ligula, added to its less powerfully serrated claws, 

 being apparently the sole distinctive characters, apart from external ones, a\ hich 

 remove it from that genus*. In real fact however, the whole of this section of the 



* I have not seen it elsewhere remarked, but I imagine that it is, in all probability, owing to the want 

 of this prolongation of the pai-aglossa; in Calathus that the ligula of that genus is described by Erichsou, 



