92 INSECTA MADERENSIA. 



Genus 31. CALOBIUS*, WoU. (Tab. II. fig. 7.) 



Corpus minutum, gracile, elongatum : cajiite prodiicto ; oculis magnis, valde prominentibus : pro- 

 thorace subquadrato, postice rotundato : elytris ad apicem pygidium vix tegentibus : alls amplis. 

 Antenna {II. 7 «) 9-articulat:E brevissimEB, articulis primo et secundo robustisj illo longissimo 

 bitlexuoso, hoc breviore obpyrit'ormi, tertio gracillimo subspatulato, reliquis clavam paraUelo- 

 oblongam sex-articulatam apice obtusam efficientibus (quarto transverso brevissimo, intus in 

 mucronem minutissimum acutissimum producto). Labrum (II. 7 b) maximum durum corneum, 

 valde porrectum, subquadratum, antice in medio profunde incisum, aut potius bilobum, baud 

 ciliatum. Mandibula (II. 7 c) breves latissimae, basi mcnibranaceBe, apicem versus internum 

 denticulatse. Maxilla (II. 7 d) bilobse : lobo externa brevi lato subrecto, apice intus mucronato : 

 interna paulo longiore graciliore, ad apicem acutissime uncinato, intus in medio setoso-pencillato. 

 Palpi maxillares articido primo minutissimo, secundo curvato, tertio vix longiore robustiore 

 subclavato, ultimo minute subulate. Labium totum (II. 7 e) valde imperfectum : palpos et 

 ligulam detegere baud potui, et nisi fallor omnino obsoleti sunt : patella magna mentiformis, 

 utrinque in angulum medium acutissimum producta, sola apparet, sed antice est magis tenuis ac 

 dense ciliata, fitquc inter pilos fortasse partium oris inferiorum rudimeuta lateaut, sed vere abesse 

 credo. Pedes subnatatorii, elongati gracillimi : femoribus cylindricis : tibiis linearibus, baud 

 spinosis sed subtilissime pubescentibus : tarsis (II. 7/) baud ciliatis, clongatis, articulo primo 

 brevissimo, secundo arete connate, quinto longissimo curvato. 



A Kokot formosus, et /3to9 vita. 



Throughout all the Madeu'an Coleoptera there is no form more truly interesting 

 than Caloblns, which so completely unites the essential characters of Ochtliebius 

 and Hydvicna, that, at first sight, it might almost be referred to either of those 

 groups. In reality, however, it is perhaps more nearly akin to the latter than to 

 the former, agreeing ^\ith it in its porrectcd, dccply-incised, and unciHated upper 

 lip, in its long slender legs, and in its antennoe being composed of seven articula- 

 tions only : but the enormously lengthened maxillary palpi of that genus, with 

 their large, somewhat thickened, and fusiform terminal joint, are eutu'ely unre- 

 ])r(>seuted in our present insect, which possesses the short and apicaUy-subulated 

 l)alpi wliich constitute one of the maui distinctive features of OcJdhehius. XeA"er- 

 theless, whilst it appropriates so many of the most important structural details of 

 the two genera in question, it offers very decided peculiarities iu which it recedes 

 from them both, since its short, broad, and mucronated outer maxillary lobe, and 

 its subelongated and powerfully hooked inner one are exceedingly remarkal)le in 

 this doi)artmont of the Philhijdrida, in Avhich the maxilla? are not generally so 

 liighly developed : added to which, its perfectly unfurrowed and posteriorly 

 roimded protliorax, and its granulated, unpunctured surface give it an unusual 

 appearance, which we are altogether unaccustomed to in the ordinary modifica- 

 tions of its immediate allies. And it is worthy of observation that its habits are 

 as anomalous as its aspect ; for, although many of the Ochthehii and Hydraince, it 

 is well known, delight in brackish spots, yet I am not aware that any of thcni 



* The present genua is written Hahhim in the plate by mistake. 



