34 INSECTA MADERENSIA. 



Cardbus marginatus, Linn. Fna Suec. (nee Sifst. Nat.) 222 (1761). 



, Fab. Eiit. Syst i. 158 (1792). 



Sarpaliis marginatus, GyU. Fna Suec. ii. 154 (1810). 

 Agonum marginatum, Dej. Spec, des Col. iii. 133 (1828). 

 , Ei-ich. Klif. der Mark Brand, i. 109 (1837). 



Habitat snb lapidibus in liumidis cditioribus Madera;, rarissime ; a meipso ad Lagoam Fanalensem 

 mense Julio a.d. 1850 inventus. 



A. green, with an seneous tinge, and slightly shining. Head and prothorax broader than those of the 

 last species, but nevertheless narrower than the elytra; the /o/v«e?- very green ; the latter de- 

 pressed, the sides and hinder angles rounded, with a dorsal channel, and with a deep impunctate 

 fovea on either side at the base ; the extreme lateral margins sometimes obscurely pale. Elytra 

 very delicately granulated ; striated, the strife with very minutely impressed points ; with three 

 large impressions down the disk of each, the anterior one of which is on the third stria, and the 

 two posterior ones on the second, from the suture ; the margins broadly testaceous. Antenna at 

 base, and the femora, somewhat piceous. Tibia, except at the extreme apex, testaceous. Tarsi 

 and apex of antenna usually piccous-black. 



Although SO ahundant an insect throughout Europe and in Algeria, the A. mar- 

 ginatus is ajiparcntly of the greatest rarity in Madeh-a, occurring only at a very 

 lofty elevation. The upland district of the Fanal (ahout 5000 feet above the sea) is 

 the only region in wliich I have hitherto observed it, where, during my encamp- 

 ment in July 1850, I eaptui-ed several specimens from beneath stones in moist 

 spots, especially at the extreme head of the Ribeiro Fundo and at the bottom of 

 the round crater-like basin, known as the Lagoa, immediately before the descent 

 of the movintain-road towards Porto Moniz. 



Genus 13. OLISTHOPUS. (Tab. I. fig. 7, 8.) 



Dcjean, Spec, des Col. iii. 17G (1828). 



Corpus minusculum, plus minusve elongato-ovatum : prothorace subcordato, angulis posticis rotun- 

 datis : alis (in spcciebus Maderensibus) obsoletis. Antenna filiformes, capite prothoraceque 

 paulo longiores, articulo primo scquentibus robustiore, secundo brevi, tertio priuio longitudine 

 sequali. Lahrum (I. Sa) quadi-atum, antice integrum et setis paucis longissimis instructum. 

 Mandifmla acutrc rcctiuscula;. Maxilla (I. 8 b) bilobse : lubo externa palpiformi biarticulato : 

 interna acuto incurvo, apice uncinato, intus valde ciliato. Palpi articulo ultimo fusiformi-acumi- 

 nato. Mentum (I. 8 c) transversum, antice profunde emarginatum et dente medio uuUo instruc- 

 tum. lAgula cornea, apice truncata pilisque duobus longis aucta ; para^/ossis membranaceis, earn 

 paulo superantibus. Pedes graciusculi : tarsis anticis in maribus (I. 8 d) articuhs primo, secundo 

 et tertio Icviter dilatatis : unguiculis simplicibus. 



The Olisthopl in outward aspect approach some of the aberrant members of the 

 last genus ; nevertheless they recede from the Anchomenl altogether in having no 

 central tooth to the cmargination of tlieu- mentmn. The species, which are few in 

 number, arc usually extremely shining and of a broA\'nish-brassy tinge. They 



