480 INSECTA MADERENSIA. 



family). The only European Corylophus is the C. cassidoides, Marsham, — ^from 

 which the Madeiran representative, apart from its numerous other specific 

 features, which wUl be at once gathered from the diagnosis, differs in being entu-ely 

 apterous, 



367. Corylophus tectifonnis, WoJl. (Tab. X. fig. 9.) 



C. rotundato-ovatus convexus piceus glaber minutissime granulatus et punctis vix observandis ad- 

 spersus, prothorace interdum subrufescentiore, limbo antico late pallido subpellucido, antennis 

 pedibusque diluto-testaceis. 



Long. Corp. lin. vix |. 



Habitat in humidis Maderfe, per regionem sylvaticam, sestate rarior : inter plantas Pteridis aqnilina 

 ad Lombo das Vacas nasceutes die solstitiali a.d. 1850 primus inveni; necnon mense Julio ad 

 Lombo dos Pecegueiros atque in locis similibus ad Ribeiro Frio Augusto iueunte ejusdem anni 

 cepi. 



C. rounded-ovate, convex, piceous, slightly shining, entirely free from pubescence, most minutely and 

 closely granulated, and with very delicately impressed points intermixed (both the granules and 

 punctures being imperceptible except beneath the microscope) . Prothorax nearly semicircular, 

 with its hinder angles slightly acuminated ; somewhat more rufescent than the ehira ; and with 

 its lateral and anterior margins (which have a slight tendency to be somewhat transparent) 

 broadly testaceous. Elytra with the punctures rather more perceptible than those of the pro- 

 thorax. Antenna and legs diluted-testaceous, — the tarsi being exceedingly pale. 



A very large and distinct Corylophus, being one of the most truly indigenous of 

 the Coleopterous inhabitants of these islands, — and receding, as has been ah-eady 

 mentioned, from the generic type in being apterous. It differs from the C. cassi- 

 doides of Marsham (the only European member of the group) in its much greater 

 bulk, somewhat less shining and more evidently sculptured surface, in its dark 

 piceous hue, more straightly truncated elytra (the sutm-al angles Ijeing con- 

 siderably rounded off in that insect, whereas here they are nearly right angles), 

 and in its longer antennte. It is exceedingly rare, or at any rate local, being con- 

 fined to the dense ravines of intermediate and lofty altitudes, — where it is usually 

 to be met with amongst the rankest vegetation and in the dampest spots. Thus, 

 during the srmimer of 1850, I brushed it from off wet fern in the almost inaccess- 

 ible region of the Lombo das Vacas, in Jvme ; as also, imdcr sunilar circumstances, 

 at the Lombo dos Pecegueii-os, in July ; and at the Eibeii-o Frio, by the moist 

 edges of the Levada, in August. 



Genus 160. GLCEOSOMA, WoU. (Tab. X. fig. 7.) 



Corpus minutissimum, rotundato-ovatum, glabrum, convexum : prothorace sub-semicirculari, anticc 

 leviter truncato-emargiiiato (caput vix omnino tcgente), ad basin elytrorum latitudine, anguiis 

 posticis leviter productis acutis : elytris apice rotundatis vix truncatis (anguiis suturalibus rectis) : 



