1890.] E. T. Atkinson— Catalogue of the Family Dytiscidse. 129 



pachys. Dr. Sharp at first placed it amongst the Dyliscidce, 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 etre associe a aucun de ceux qui precedent ou qui suivent : ses 

 hanches posterieures le rattachent aux Haliplides, ainsi qui les tarseg 

 de la meme 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 ou the Dytiscidce of the Oriental 

 Region. 



Aube, C. : — 



Species general des Hydrocanthares et Gyriniens pour faive suite au Species 

 general des Col6opteres de la collection de M. Le Comte Dejean, vi, Paris, 

 1838. 

 Blanchard, E. : — 



Voyage au Pole Sud sur I' Astrolabe., 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 Kafer 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. 

 Kedtenbacher, L. : — 



Hiigel's Kaschmir, iv (2), 1844. Stuttgard. 

 Eegimbart, M. : — 



'Eecherches sur les organes copulateurs dans le genre Dytiscus,' in Ann. Soc. Ent. 

 Fr., (5s.) vii, 1877, p. 263. 



Etude sur la classification des Dytiscides, I. c„ viii, 1878, p. 447. 



' Dy tiscides de Birinanie', in Ann. Mus. Civ. Gen., (2s) vi, 1888, p, 609. 

 Schaum and Kiesenwetter :— 



Naturges. d. Ins. Deutschl., i, ii, 1859-60. 



* Dytisc. , p. 974, 



