On Aquatic Carnivorous Coleoptera or Dytiscide. 781 
(angulis anticis prominulis et acutis) ad basin subsinuato ; quoad colorem rufo-testaceo, ad basin tenuiter 
nigro ; scutello triangulari, levi, nigro; elytris sat latis et ad apicem sat acuminatis, undique seriebus 
punctorum rarorum tribus distinctis ornatis, rufo-testaceis, sutura equaliter et seriebus macularum 3 
inequalibus nigris ; he macule sinuate, longitudinaliter productz, interrupt, in vittis apud punctorum 
series elytra ornant, et puncta ipsa plerumque maculis minoribus circularibus cinguntur: corpore subtus 
fusco ; pedibus flavis, tibiis posticis fuscis ; antennis flavis. Long. corp. lin. 6 ; lat. lin. 34.” 
“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 sutural 
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 (being 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 third line of black coloration is between the second and third rows of punctures, and consists 
of three markings—one near the shoulder, which is confluent with the first at the base, one medial, 
which is shorter and more minute, and a third post-medial, which is much broader, extending from the 
second row of punctures to the margination ; at 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 punctaio et ad 
latera apud basin reticulato, vel quasi irregulariter acuducto, quoad colorem testaceo-rufo, marginibus ad 
apicem et basin tenuiter nigris ; scutello triangulari, levi, 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 ; he macule autem non confuse aggregate, 
sed plus minus ordinibus disposite sunt: corpore subtus, pedibusque rufo-fuscis. Long. corp. lin. 5 ; 
lat. lin, 24.” 
“ Allied to H. leander of South Europe, and, at first sight, only a variety of that species.” 
This is, 1 should think, pretty certain to prove a synonym of Dytiscus grammicus (No. 1028).— 
ID, Ss 
1318. Hydaticus paganus, Clk., Tr. Ent. Soc., 1864, p. 215. Congo. 
“¢Oblongo-ovalis, parallelus, punctorum tri-serie ornatus, niger, nitidus : capite levi, rufo, ad basin 
transverse nigro ; thorace haud ad basin sinuato, antice excavato, rufo-flavo, ad medium subtiliver fusco- 
adumbrato, marginibusque antico et postico nigris (hoc ad medium latiori, illo transverso eequali 
attenuato) ; elytris parallelis, sat productis, punctorum seriebus 3 (puncta intervallo distantia, haud pro- 
funda, et aliquando obsoleta sunt), quoad colorem nigris, humeris (macula parva angulata) marginibusque 
irregulariter testaceis vel rufo-flavis ; corpore subtus fusco-nigro ; pedibus antennisque flavis, illorum 
femoribus tibiisque posticis fuscis. Long. corp. lin. 63 ; lat. lin. 33.” 
“Nearly allied to H. capicola, Aubé ; but differing from it by its more parallel form and entirely rufo- 
flavous head and thorax; the elytra also, instead of being more or less flavous irrorated with black, are 
entirely 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. 
5H 2 
