h. COLEOPTERA, X : HYDROPHILIDAE. 



By A. d'Orchymont. 



Dr. Kemp's collection of H^^drophilidae from the Abor 

 country and the frontiers of Assam comprises 47 specimens and 

 a dozen species, of which three are new to science. The determin- 

 ation of some of these has been attended with great difficulties, 

 especially in the case of Amphiops viirahilis vSharp, which was first 

 thought to be the same as Illiger's Hydrophilus gibbus. Some of 

 the specimens under examination were sent in 1914 to Mr. Kolbe, 

 Director of the Berlin Museum, for comparison with the unique 

 tvpe of that beetle, described in 1801. Owing to the w^ar I have, 

 however, only recently succeeded in obtaining the opinion of that 

 entomologist. 



Hydracna (s. str.) dimorpha, sp. nov. 



H. oblongo-ovalis, parum convexa, supra sordide brunnea, 

 palpis tarsisque pallid ioribus, pronoto anteriore et posteriore, 

 elytrorum marginibus rufescentibus ; capite rugose punctato ; 

 pronoto rectangulato, longitudine latiore, antice attenuate, post 

 medium sat abrupteexcisis, margine anteriore sat profunde excisis 

 vel sinuatis, lateribus pertenuissime crenalatis ; elytris separatim 

 rotundatis, angulis suturalibus dentatis, dense punctato-seriatis, 

 punctis approximatis et quadratis, intervallis planis, margine 

 (praeter ad apicem) leviter depresso. cf : palporum maxillaribus 

 articulis secundo tertioque (2° praecipue) ad apicem incrassatis 

 et infuscatis, 4° interne obscure angulato. 



Type: Indian Museum, No. 2546/19, c^ , 1-5 mm., Dibru- 

 garh, N.-K. Assam, Abor Expedition, i7-i9-xi-i9ii (Kemp). 

 Found in small tanks. 



The insect for which this name is proposed is in a decayed 

 condition, which did not enable me to examine the underside ; but 

 I have no doubt of its being a male, on account of its thickened 

 maxillary palpi. 



Head not very distinctly punctured, of a rugulose and obscure 

 sculpture, nearly black. Eabrum deeply excised anteriorly, the 

 two lobes slightly curled up in front. Maxillary palpi long, second 

 joint very long and curved, third very much shorter (less than half), 

 last joint a little longer than the third, acuminate. 



Pronotum testaceous with a transverse blackened band in the 

 middle going nearly from side to side, less attenuated before than 

 behind, the sides without angulation, only rounded in the middle, 

 but emarginate just before the nearly rectangular angles. Sides 

 microscopically serrate. Punctuation very coarse even on the 



