778 On Aquatic Carnivorous Coleoptera or Dytiscida. 
modice rotundato, minus tenuiter marginato ; elytris guttulis duabus pellucidis obsoletis. Wem. Long. 
22 lin.” 
“‘G, aftini Payk. affinis, sed paullo brevior et latior, sculptura elytrorum fere ut in G. tarsato, Zett. 
Caput latiusculum, subtilissime reticulato-strigosum, nigrum, labro maculisque duabus verticis rutfis, 
impressionibus anticis parvis, sed satis profundis ; palpis ferrugineis, maxillaribus apice anguste piceis, 
labialibus articulo secundo subtus obsoletissime tuberculato-prominulo. Antenne prothoracis basin 
attingentes, ferrugineze, articulo ultimo apice piceo. Prothorax fortiter transversus, antice angustatus, 
lateribus modice rotundatis, minus subtiliter marginatis, angulis anticis productis, actttiusculis, posticis. 
subrectis, basi utrinque obsoletissime sinuato; supra modice convexus, niger, nitidus eneo-micans, 
subtiliter sed minus dense reticulato-strigosus, serie punctorum basali medio late interrupta, apicali 
integra, ambabus e punctis minutis valde obsoletis et irregularibus constitutis. Elytra ovalia, basi pro- 
thoracis latitudine et lateribus cum illo continue arcuata, postice rotundato-angustata ; supra modice 
convexa, nigra, nitida, eneo-micantia, subtiliter sed minus dense reticulato-strigosa, cellulis latis, 
irregularibus, versus apicem minoribus, seriebus tribus e punctis inordinatis impressis postice sine ordine 
dispersis ; guttulis duabus obsoletissimis pellucidis. Corpus subtus nigrum, laciniis lateralibus metasterni 
subtriangularibus. Pedes ferruginei, femoribus, presertim posticis, obscurioribus, fuscis, tarsis posticis 
unguiculis ineequalibus, apice curvatis.” 
Rare ; found at Kuopio (63°), in Gothland. 
1304. Gaurodytes suturalis, Crotch, Tr. Am. Ent. Soc. IV, p. 423. North America. 
“ Regularly ovate, black, above slightly bronzed, subopaque ; thorax with the sides hardly rounded, 
posterior angles rectangular ; elytra closely reticulate, the sutural region nearly smooth, dorsal punctures 
evident irregular, the yellow spot beyond the middle is but little evident ; body beneath strigulose, 
posterior femora obsoletely punctulate, tibie with a regular subdorsal row of deep punctures. das, 
anterior claws unarmed. Length °35 inch,” 
“¢ Nevada.” 
1305. Hydaticus apicalis, Boh., Ins. Caffr. I, page 239. Caffraria. 
“‘ Ovalis, convexiusculus, nitidus, subtus piceus ; capite flavo-testaceo, postice nigro, flavo-trimaculato ; 
prothorace subtiliter, crebre punctulato, flavo-testaceo, pone medium vitta transversa longiori, utrinque 
abbreviata, nigra, medio ramulum brevem, apice dilatatum anterius emittente, elytris nigris, dorso 
parcius, ad latera crebrius flavoirroratis, plaga magna, communi, apicali flava, medio confertim nigro- 
irrorata. Long. 123, lat. 63 m.m.” Caffraria interior. 
[An extended description follows this diagnosis. | 
The species is probably allied to Hydaticus sobrinus and galla (Nos. 1041 and 2.)—D. 8. 
1306. Hydaticus aruspex, Clk., Tr. Ent. Soc., 1864, p. 212. China. 
‘“‘ Oblongo-ovalis, parallelus, punctato-striatus, subnitidus, niger: capite favo, ad basin late nigro 
(inter oculos, apud vittee nigree marginem, flavo-bimaculato) ; thorace lateribus rotundatis, marginem 
juxta undique impresso, et antice transverse (sed obsolete et tenuiter) depresso, et punctato ; quoad 
colorem flavo, ad basin late et transverse nigro (vitta nigra ad medium lata, latera versus tenuior, haud 
margines attinet); scutello transverso-triangulari, nitido nigro; elytris parallelis, crebre subtilissime 
punctatis, etiamque seriebus 3 punctorum (quorum externa penitus obsoleta est) ornatis, colore nigris, 
marginibus undique late et squaliter a humeris penitus ad apicem flavis ; corpore subtus nigro-fusco ; 
pedibus rufis ; antennis rufo-flavis. Long. corp. lin. 64; lat. lin. 33.” 
« Parallel in form, like ruficollis, Fab, though much narrower than that insect ; the species hefore us 
