INSECTA MADERENSIA. 343 



rent to be discerned at all) of a somewhat triangular, basal, snbcinereons cloud. 

 We can thus understand, that when this basal nebula and the postmcdial vitta 

 are in the least decipherable (which alone is the case in fresh and unrubljcd speci- 

 mens), the only darker portion which may be said to be at all evident is (the 

 feeblest indication of) a central transverse band, expanding towards the lateral 

 edges but decreasing in width, and becoming either almost or entirely absorbed, on 

 the disk. It is not always however that the antemedial fascia and the scutellary 

 blotch are entirely confluent, since sometimes the latter does not exist at all,— 

 under wliich circumstances the former is of course comparatively weU-defined. 

 In the A. cylindricollis, on the contrary (judging from the single example Avhicli 

 has hitherto come beneath my notice), this amalgamation is complete, — a large 

 and faded basal patch being the consequence, and which is not only more con- 

 spicuoiis and of a different outline from the one which it is the tendency of the 

 A. TFollastoni to possess, but seems, likewise, to be destitute of the ashy-white 

 scales which are so characteristic of that insect. The A. Wollastoni is decidedly 

 rare, occurring more particiilarly in moist grassy spots of the dense ravines of 

 intermediate altitudes. I have taken it at the Lombo dos Pecegueiros in July, 

 and at the Ribeiro Frio in August ; and dtu'ing May of 1850 I even captured a 

 specunen in the chestnut-woods of Santa Anna, — the lowest elevation at which I 

 have observed it. 



(Subf. 5. EEIRHINIDES.) 



Genus 118. TYCHIUS. 



(Grermar) Schonherr, Cure. Disp. Meth. 245 (1826). 



Corpus parvum, oblongo-ovatum, squamosum : rostro elongato arcuato, modo basi crassiusculo et 

 apicem versus paulatim attenuate, modo (ut in speciebus Madereusibus) tenui lineari : oculis in 

 typicis subrotundatis, sed in speciebus insularum Maderensium duabus valde reniformibus : 

 prothorace transverso, basi apiceque subtruncato, ad latera plerumque Eequaliter rotundato : alia 

 (in nostris) obsoletis. Antennce longiusciilse sat graciles, ante medium rostri insertsej funiculo 

 7-articulato, articulis prime et secundo elongatis obconicis, reliquis brevioribus ; capitulo oblongo- 

 ovato quadri-annulato. Pedes aut robusti, aut parum graciles, aniici basi approximati : femoribus 

 modo (ut in speciebus nostris) muticis, modo subtus denticulatis : tibiis rectis, ad apicem e.xternum 

 truncatis excavatis muticis, ad internum in uncum valde deflexum plus miuusve obsoletum 

 productis. 



Although recorded from most parts of the world, the Tych'd are more especially 

 European insects, and may be said to find their maximum in central and Mediter- 

 ranean latitvides. They occur, principally, either beneath stones in diy and sandy 

 spots, or on the foHage of the low plants peculiar to such localities. The genus 

 divides itself into two sections, in one of which the rostrum is somewhat thickened 

 at its base and tapers towards its apex, wliilst in the other it is slenderer and 

 linear throughout. It is to the latter of these that the Madeiran representatives 



