34: 
Prof. J.C, Schiddte 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 ‘ Naturhist. 
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. Gerstacker who kindly undertook to compare 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 different species. 
B. Sockets of anterior coxe@ closed. 
Lobes of labellum with only one long, much subdivided branch. 
Spinulous ridges on anterior tibie close together. | 
TADUNUS, 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 mandibles attenuated. Lobes of labellum 
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 tibie close together. 
A. Inner lobe of mazille spinulous, the terminal spines strong, blunt. 
Labrum with a round emargination. Lobes of Jabellum broadly 
rounded ; the spines of the comb lobate at their points. 
Sockets of first pair of coxe externally open. 
BarGus, nov. gen. 
Danish species :—]. B. erraticus, Er., r. 2. B. opacus, Er., 
m.fr. 3. B. pallipes, Gravenh., fr. 4. B. ratellus, un. 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 antennz 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 mazille without spines, ending with a brush of bristles. 
Lobes of Jabellum elongated, pointed. 
a. Sockets of anterior cox@ externally open. 
Terminal part of mandibles with one tooth behind the apex. 
Labrum deeply bifid. Tooth of the comb serrate. 
Astycors, Thomson. 
