On Aquatic Carnivorous Coleoptera or Dytiscidce. 781 



(angulis anticis prominulis et acutis) ad basin subsinuato ; quoad colorem rufo-testaceo, ad basiu temiiter 

 nigro ; scutello triangulari, huvi, uigro ; elytris sat latis et ad apiceui sat acuminatis, iiuditiue seriebus 

 punctorum rarorum tiibus distinctis ornatis, rufo-testaceis, sutura jequaliter et seriebus macularuin 3 

 insequalibus nigris ; Use macula; siuuataj, longitudinalitev productue, iuterruptre, in vittis apud punctorum 

 aeries elytra ornant, et puucta ipsa plerumque maculis minoribus circularibus cinguntur : corpora subtus 

 fusco ; pedibus flavis, tibiis posticis fuscis ; antennis flavis. Long. corp. lin. 6 ; lat. lin. 3|." 



" H. nigro-marmoratus will take its place near H. dregii, which it generally resembles in pattern : it 

 is, however, abundantly distinct : the sutural line is very evenly black : along the first row of punctures 

 (which are distinct but widely separated) runs an uneven, irregular, longitudinal marking from the base 

 to the apex (in some places broader than but for the most part about equal in breadth to the sutmul 

 marking) ; this is interrupted in front of the middle ; the second longitudinal marking is more irregular 

 still, it is placed rather within the second line of punctures, is narrower than the first, and con- 

 fluent with it near the base and apex ; the punctures themselves (bemg on the outer side of this 

 marking), and also the punctures of the third row, are each surrounded by a regular and circular mark- 

 ing ; the tliird line of black coloration is between the second and third rows of punctures, and consists 

 of three markings — one near the shoulder, which is coufiuent with the first at the base, one medial, 

 wliich is shorter and more minute, and a third post-medial, which is much broader, extending from the 

 second row of punctures to the margination ; a"; the medial margination there is also another fuscous 

 marking." 



"There is no other species known to me with which H. nigro-marmoratus can be confounded." 



1317. Hydaticus nigro-vittatus, Clk., Tr. Ent. Soc, 1864, p. 222. Japan. 



" Ovalis, convexiusculus, sat latus, et ad latera nonnihil rotundatus : thorace leviter puuctaio et ad 

 latera apud basin reticulato, vel quasi irregulariter acuducto, quoad colorem testaceo-rufo, marginibus ad 

 apicem et basin tenuiter nigris; scutello triangular!, Isevi, nigro; elytris undique punctorum seriebus 

 duabus (punctis raris et aliquando obsoletis), omnino subtilissime et crebre punctatis, testaceis vel rufo- 

 testaceis ; vitta suturali alteraque (vel duabus approximatis) undique nigris ; inter vittas et margines 

 elytra quasi nigro-irrorata maculis subtilissimis sparguntur ; hse maculae autem non confuse aggregate, 

 sad plus minus ordinibus dispositse sunt : corpore subtus, pedibusque rufo-fuscis. Long. corp. lin. h • 

 lat. lin. 2i." 



" Allied to H. leander of South Europe, and, at first sight, only a variety of that species." 



This is, I should think, pretty certain to prove a synonym of Dytiscus grammicus (No. lU28). — 

 D. S. 



1318. Hydaticus paganus, Clk., Tr. Ent. Soc, 1864, p. 215. Congo. 



" Oblonco-ovalis, parallelus, punctorum tri-serie ornatus, niger, nitidus : capita Isevi, rufo, ad basin 

 transverse nigro ; thorace haud ad basin smuato, antice excavato, rufo-flavo, ad medium subtilii-er fuseo- 

 adumbrato, margmibusque antico et postico nigiis (hoc ad medium latiori, illo trausverso ajquali 

 attenuato) ; elytris parallelis, sat productis, punctorum seriebus 3 (puncta iutervallo distantia, haud pro- 

 funda, et aliquando obsoleta simt), quoad colorem nigris, humeris (macula parva angulata) marginibusque 

 irra'mlariter testaceis vel rufo-flavis ; corpore subtus fusco-nigro ; pedibus antennisque tlavis, illorum 

 femoribus tibiisque posticis fuscis. Long. corp. lin. 6| ; lat. lin. 3|." 



" Nearly allied to H. capicola, Aube ; but differing from it by its more pai-allel form and entirely rufo- 

 flavous head and thorax ; the elytra also, Instead of being more or less flavous irrorated with black, are 

 entii-ely black, the humeral angle being flavous, and also the line of margination, obscurely and inter- 

 ruptedly, but more distinctly flavous near the apex." Gold Coast, a single specimen. 



5 H 2 



