34 Prof. J. C. Schiodte on the Tunnelling Coleopterous 



markably tenacious of the locality : thus a small colony of this 

 species still existed thirty years ago in the unpaved footpath of 

 a little-frequented street in Copenhagen, which in ancient 

 times was a meadow such as it generally inhabits. 2. B. bi- 

 cornis, Ahrens, m. fr. on marshy soil near high-water mark, in 

 company with Corophium longicorne ; its tunnels reach a depth 

 of 2 feet, and are of importance for the formation of new allu- 

 vium. 3. B. diota, n. sp., resembles B. hinnulus, Er., but is 

 distinguished by the great size and development of the anterior 

 corners of the forehead, and by the elytra being more sparingly 

 and finely punctate. The larva was described in ' Natm-hist. 

 Tidsskrift,' iii. p. 148 as that of B. hinnulus, Er., for which the 

 Danish specimens of the imago were first mistaken ; and it is 

 Dr. Gerst'acker who kindly undertook to compane Danish 

 specimens with the original specimens of B. hinnulus of Erich- 

 son in the Berlin Museum, and has thus ascertained that the 

 former belongs to a diiFerent species. 



B. Sockets of anterior coxce closed. 



Lobes of labellum with only one long, much subdivided branch. 

 Spinulous ridges on anterior tibice close together. 



TadunuSj nov. gen. 



Danish species : — 1. T.fracticornis, Payk., fr. 2. T. crassi- 

 collis, Boisd. & Lacord., r. 3. T. atricapillus, Germ., r, 



II. Terminal part of mancUhles attenuated. Lobes of lahellum 

 ramified on the outside : ramifications short and of uniform 

 length, some of them bifid or trifid at the apex. 

 Posterior corners of pronotum projecting from posterior margin. 

 Spinulous ridges on anterior tibice close together. 



A. Inner lobe of maxillce spinulous, the terminal spines strong, blunt. 

 Labrum with a round emargination. Lobes of labellum broadly 



rounded ; the spines of the comb lobate at their points. 

 Sockets oi first pair of coxa externally open. 



Bargus^ nov. gen. 



Danish species : — 1 . B. erraticus, Er., r. 2. B. opacus, Er., 

 m. fr. 3. B. pallipes, Gravenh., fr. 4. B. ratellus, n. sp., 

 m. fr, 5. B. terebrans, n. sp., m. fr. The two new species re- 

 semble B. pallipes, but are shorter and thicker, the teeth of their 

 mandibles strong and powerful, and placed close behind the 

 point, whilst in pallipes they are small and removed from the 

 point ; the posterior corners of the pronotum are perceptibly 

 salient in the new species, obtuse in B. ratellus, rectangular 

 in B. terebrans ; the colour of the antennae and legs is deeper 

 in the two new species, particularly in B. ratellus. The latter 

 differs from B. terebrans by possessing a small but distinct 

 depression on the top of the head, which is wanting in the 

 latter, and by the elytra being closely and finely punctated in B. 

 ratellus, whilst their puncture is much coarser in B. terebrans, 



B. Inner lobe of maxillm without spines, ending with a brush of bristles. 

 Lobes of labellum elongated, pointed, 

 rt. Sockets of anterior coxa; externally open. 



Terminal part of mandibles with one tooth behind the apex. 

 Labrum deeply bifid. Tooth of the comb serrate. 

 AsTYCops, Thomson. 



