129 
pachys. Dr. Sharp at first plaoed it amongst the Dytiscidce, but subse- 
quently agreed * with Dr. Horn that it should be removed from the 
Dytiscidce and treated like Pelobius. 
Pelobius was also formed into a distinct group by Lacordaire who 
remarks that • cette tribu ne comprend qu’un seul genre, mais qui ne 
peut 6tre associ6 & aucun de ceux qui precedent ou qui suivent : ses 
hanches post^rieures le rattachent aux Haliplides, ainsi qui lea tarses 
de la mOrne paire sont A, peine plus natatoires,’ and declares it to be 
another of the aberrant genera connecting the Carabidce with the Dytiscidce. 
Describing the genus itself he gives it as ‘ un Dytiscide pourvu 
d’une tete de Carabique.’ Notwithstanding, therefore, the great authority 
of Dr. Horn, it will, in the present state of our knowledge, be advisable 
to retain Lacordaire’s arrangement as that most convenient. Below 
is given a list of some of the writings on the Dytiscidce of the Oriental 
Region. 
Aube, C. : — 
Species gdndral des Hydrocanthares et Gyriniens pour faire suite au Species 
general des Col4optdres de la collection de M. Le Comte Dejean, vi, Paris, 
1838. 
Blanchard, E. : — 
Voyage au Pole Sud sur VAstrolabe, Zool., iv, Paris, 1853. 
Boheman, C. : — 
Kongliga Svenska Fregatten Eugenies resa, Col., Stockholm, 1858. 
Clark, H. 
Transactions Entomological Society London, (3s) i, 1863, p. 413. 
Erlchson, W. F. : — 
Die Kftfer der Mark Brandenburg, Berlin, i, 1837. 
MacLeay, W. S. : — 
Annulosa Javanica, or an attempt to illustrate the natural affinities and analogies 
of the insects collected in Java by Dr. T. Horsfield. London, 1825. 
Motschulsky, V. 
Etudes entomologiques, Helsingfors, iv, 1855 : viii, 1859. 
Redtenbacher, L. : — 
Hiigel’s Kaselimir, iv (2), 1814. Stuttgard. 
Regimbart, M. 
‘Recherches sur les organes copulateurs dans le genre Dytiscus,’ in Ann. Soc. Ent. 
Fr., (5s.) vii, 1877, p. 263. 
Etude sur la classification des Dytiscides, l. c,, viii, 1878, p. 447. 
‘Dytiscides de Birmanie’, in Ann, Mus. Civ. Gen., (2s) vi, 1888, p. 609. 
Schaum and Kiesenwetter 
Naturges. d. Ins. Deutschl., i, ii, 1859-60, 
* Dytisc , p. 974. 
