INSECTA MADERENSIA. 93 



reside in water that is purely salt, — whereas Calobim occurs amongst marine 

 ConfervcB in the pools formed by the actual sea. 



73. Calobius Heeri, WoU. (Tab. II. fig. 7.) 



C. gracilis glaber et fere opacus, crebre granulatus, subsenescenti- vel subcuprescenti-niger, pro- 

 tboracis limbo pellucido et angulis posticis valde rotundatis, elytris obsoletissime substriatis, 

 antennis tibiisque diluto-testaceis. 



Long. Corp. lin. 1. 



Habitat Madcram maritimam, mihi non obvius : ad " Gorgulbo," baud procul ab m-be Funchalensi, 

 inter confervas in staguantibus aquis marinis crescentes, primus detexit cl. Dom. Heer, cujus in 

 honorem nomen triviale dedi. 



C. slender, elongated, glabrous, and almost opake, brownish-black, and with either an seneous or a 

 slightly coppery tinge. Head and prothorax closely and minutely granulated ; the former a good 

 deal produced, with the eyes very large and prominent, and with an impression on either side of 

 the forehead ; the latter subquadrate, being truncated in front and rounded behind, without any 

 appearance of grooves or sulci, — even the dorsal channel being in most instances imperceptible ; 

 the extreme margins (anterior, posterior and lateral), especially towards the anterior angles, 

 transparent. Elytra rather more roughened than the head and prothorax, and (under a high 

 magnifying power) with a few very minute, distant punctures, disposed in longitudinal rows, 

 and with the interstices just perceptibly raised. Anteimx exceedingly short and slender, usually 

 not at all apparent from above; flavescent. Palpi and legs piceous-black,— the latter having the 

 tibicB, especially the two anterior ones, obscurely flavescent. 



It is to Professor Heer that we are indebted for the discovery of this very 

 interesting little insect, which entirely eluded my own researches in these islands. 

 It was first detected by him, on the 6th of February 1851, adhering to marine 

 CoiiferviB in salt-water pools at the Gorgulbo, near Funchal, — in which position it 

 has been since captui-ed, abundantly, by M. Rousset. I am informed by my friend 

 Dr. H. Schaum, of Berlin, that it is very closely allied to the Ochthebms quaclri- 

 collis, Mulsant (Ann. de la Soc. Royal d'Agricult. de Lyon, a.d. 1844, p. 377), 

 from Corsica and Dalmatia, though specifically distinct ; and that in all probability 

 the above species will be found, on dissection, to be a true Calobius. 



Genus 32. LIMNEBIUS. 



Leach, Zool Miscell. iii. 93 (1817). 



Corpus minutum, plus minusve ovatum vel ellipticum : prothorace brevi, postice lato : elytris apice 

 leviter truncatis, pygidium vix tegentibus : alis amplis. Antenna 8-articulat£e brevissimae, 

 articulis primo et secundo elougatis, tertio, quarto et quinto miuutis, reliquis clavam triarticu- 

 latam efficientibus. Labrum transversum, antice leviter emarginatum. Mandibula breves lat?e, 

 apice fissffi. Maxillts bilobse : lobo externa lato, apice dense barbato : interno paulo longiore, 

 angusto, recto, ad apicem uncinato, intus ciliato. Palpi filiformes, articulo ultimo elongato 



