INSECTA MADERENSIA. 95 



specimens, adhering to the under sides of decaying leaves, in the small shallow 

 pools and trickling streams with which those densely wooded uplands everywhere 

 abound. 



Genus 33. LACCOBIUS. 



Erichson, Kaf. der Mark Brand, i. 202 (1837). 



Corpus parviim, subhemisphaericum : prothorace brevi, postice lato : alis amplis, Antennce S-articulatse 

 breves, articulo primo longiusculo, secundo breviore crasso, tertio minutissimo, quarto quintoque 

 latioribus transversis arete connatis (hoc subpoculiformi), reliquis clavam oblongam pubesceatem 

 triarticulatam efficientibus. Labrum transversum, antice vix emarginatum. Mandibula breves 

 latse, apice incurvae fissse. Maxilla bilobte : lobo externa lato ovato, apice barbato, ungue minu- 

 tissimo incurve terminali munito : interno paulo breviore angustiore, intus ad apicem barbato 

 eiliato, margiue interno membrana instructo. Paljn subfiliformes, articulo ultimo elongato-sub- 

 ovatoj maxillares longiusculi; labmles mediocres. Mentum amplum, transverso-quadratum, 

 margine antico rotundato. Ligula brevis lata, apice fissa, aut potius biloba. Pedes su^bnatatorii, 

 robusti, antici breviusculi : femoribus tibiisque compressis : his spinosis, valde calearatis, baud 

 ciliatis ; anticis apicem versus leviter dilatatis ; posticis curvatis : tarsis filiformibus elongatis 

 parce ciliatis, articulo primo brevissimo, secundo arete connato. 



Laccobms may be known by the convex and somewhat hemispherical form of 

 the insects composing it, — which are not only of a much larger size than the 

 Limnebii, and have their elytra entirely covering their abdomen, but the articula- 

 tions of their antennae and the lobes of their maxillae are differently constructed 

 from those of that genus ; their tibiae also (the hinder pair of which are alone 

 curved) are more powerfully spurred and spinulose, and their tarsi are more 

 elongated and slender. Erom Hi/drohius (to which, in general aspect, it approaches 

 nearer than it does to Llmneb'ms), its 8-jointed antennae, the minute terminal claw 

 with which the outer lobe of its maxillae is furnished, added to its hinder tibiae 

 being slightly curved, will readily separate it. 



75. Laccobius minutus. 

 Ii. rotundato-ovatus couvexus niger punctulatus, prothoracis lateribus elytrisque pallido-testaceis, his 



dense substriato-punctatis et plus minusve, prsesertim in discum, nigro-irroratis, antennis pedi- 



busque pallido-ferrugineis. 

 Long. corp. lin. 1|-1|. 



Chrysomela mimita, Linn. Fna Suec. 166 (1761). 

 Hydvophilus hipunctatus, Fab. ^yst. Eleu. i. 251 (1801). 



minutus, G-yll. Ins. Suec. i. 116 (1808). 



Laccobius minutus, Erich. Kaf. der Marh Brand, i. 203 (1837). 



Habitat Maderam excelsam sylvaticam, in locis similibus ac Limnebius grandicoUis, sed illo multo 

 frequentior. 



L. short-ovate, convex, black (sometimes with a just perceptibly aeneous tinge), and slightly shining. 



