oF MADEIRAN COLEOPTERA. 
tion with the obtuseness of its antennal club (the terminal joint of 
which is, as there, exceedingly globose), and its apterous body, im- 
mediately stamp it as a member of the same geographical type. Its 
habits are somewhat dissimilar from those of the following species, 
which resides in the small trickling streams of a very lofty elevation : 
for all the specimens of the H. Marchantie which I have yet detected 
were obtained from beneath the dense masses of the Marchantia 
polymorpha, L., which mat the surfaces of the dripping rocks, at the 
edges of the waterfalls, at low and intermediate altitudes. In such 
situations I frequently took it, along the northern coast of Madeira 
proper,—especially between Sio Vincente and Seisal, and at the 
Passa d’Areia, near Ponta Delgada,—during the summer of 1855. 
88. Hydrobius conglobatus. 
Hydrobius conglobatus, Woll., Ins. Mad. 97 (1854). 
Inhabits the small streams, and other moist spots, of Madeira 
proper, on the upper limits of the sylvan districts. Very rare. 
Genus 36. PHILHYDRUS. 
Solier, Ann. de la Soc. Ent. de France, iii. 315 (1834). 
89. Philhydrus melanocephalus. 
Hydrophilus melanocephalus, Olv., Ent. iii, 89. 14 (1795). 
Hocdrobine melanocephalus, Erich., Kaf. der Mark Brand. 1.209 (1837). 
Philhydrus melanocephalus, Muls., Palp. 187 (1844). 
, Woll., Ins. Mad. 98 (1854). 
Inhabits the streams of Porto Santo, presenting two distinet states 
of colouring,—a lighter and a darker one. Common. 


Fam. 6. SPHAURIDIADZ. 
Genus 37. DACTYLOSTERNUM. 
Wollaston, Ins. Mad. 99. tab. iii. f. 1 (1854). 
90. Dactylosternum Roussetii. 
Dactylosternum Roussetii, Woll., Ins. Mad. 100. tab. iti. f. 1 (1854). 
Inhabits the south of Madeira proper, occurring on and near the 
sea-beach in the immediate vicinity of Funchal,—especially in the 
empty shells of crabs, and amongst other filthy rejectamenta, in the 
neighbourhood of the drains and sewers. Excecdingly local. 
