624 Records of the Indian Museum. [Vol. VIII, 



sides. Lateral foveae conspicuous and joined together by a longi- 

 tudinal impression. Anterior and especially posterior transverse 



impressions nearly effaced. 



Elytra elongate with numerous 

 coarse series of nearly quadrate punc- 

 tures and an intercalate short sutural 

 series, the series still indicated on the 

 apex, intervals very narrow and not 

 carinate ; pubescence very short ; sides 

 explanate and lighter in colour, the 

 apex separately rounded with the 

 sutural angle produced to a micros- 

 copic tooth. 

 ^ , Male (fig. i) with the second ioint 



Text-fig. \. — Hydraena di- r , , ' .„ ' , . . -" 



morpha, sp. nov. Maxillary ^f the maxillary palpi very mcrassate 

 palpi. " and infuscate on its second half, third 



joint also thickened towards the apex 

 but to a lesser degree, last joint faintly angulate beyond middle 

 on the inner side; the anterior border of the pronotum seems also 

 more deeply emarginate in the male. 



I have seen a cotype ( 9 ) of this new species, No. 2QQO/19, 

 from the same locality , taken on the same date also by Dr. Kemp. 

 This form is ver}' distinct from my newly described B . indica and 

 from G. C. Champion's H. hihamata, cirrata and maculicollis , also 

 from India. 



Hydrochus annamita, Regimbart. 



Eight specimens from Dibrugarh, N.-E. Assam, ly-ig-xi* 

 191 1, in small tanks (Nos. 2547/19 and 2549/19), have been so 

 labelled on comparison with Regimbart's description. According 

 to this author the species is somewhat variable ; in the beetles 

 before me the punctures of the elytra appear to be less polyhedric 

 and the interspaces less narrow, as noticed in the typical specimens 

 from Annam. 



Hydrochus ? binodosus, Motschulsky. 



,On account of the general form and of the hind tubercle on 

 the 5th interspace, I should refer to this name one specimen 

 (No. 2548/19) captured in small tanks at Dibrugarh, N.-E. Assam, 

 Abor Expedition, r7-i9*xi-i9ii {Kemp). But the femora are of 

 a light colour, infuscated on the knees, instead of ' ' presque noires," 

 as Motschulsky says of his species. Motschulsky 's forms {violaceo- 

 micans, opacus and binodosus) are from the " East Indies " with- 

 out other indication ; no author has met with them since the time 

 they were too briefly described in i860 and the^^ are therefore 

 insufficiently known. As to the two first species (//. violaceo- 

 micans and opacus) they must be closely allied, if not identical, 

 withNietner's i7. /^c/^s^i'/s of 1897. Judging from the description, 

 the same may be said of Fairmaire's latitans (1888) from Tonkin. 



