794 On Aquatic Carnivorous Coleoptera or Dytiscide. 
1364. Hydroporus dorsoplagiatus, Fairm., Ann. Soc. Fr. 1880, p. 247. Algeria. 
“Long. 2? mm. Oblongus, modice convexus, postice leviter attenuatus, fuscus, capite, antennis 
prothoracisque margine laterali rufo-testaceis, elytris flavido-testaceis, macula magna transversa, medio 
sita, postice longe per suturam prolongata, marginem externum haud attingente, sed postice anguste 
producta infuscata, pedibus rufescentibus ; capite convexiusculo, ad oculos impresso ; prothorace brevi, 
antice leviter angustato, lateribus leviter arcuatis, utrinque striola laterali parallela signato, margine 
postico medio obtusissime angulato, antice lineola transversa leviter impresso ; elytris oblongis, postice a 
medio attenuatis, apice obtuse acuminatis, levigatis, utrinque lineis 2 leviter impressis et tenuiter punc- 
tulatis, apicem versus obsoletis ; pectore utrinque tenuiter punctulato et vage infuscato.” 
“‘ Voisin du sexguttatus, mais bien plus grand, plus allongé un peu plus paralléle vers le milieu ; les 
élytres ne sont pas distinctement ponctuées, leur coloration est différente, la grande tache dorsale n’est 
pas nettement arrétée, ne se prolonge pas autant en avant et ne determine pas de taches jaunes en arriére, 
leur surface longitudinale est aussi bien moins convexe.” 
1365. Hydroporus dubius, Aubé, spec. 517. 
“« Elongato-ovalis, depressiusculus ; capite testaceo ; thorace ad latera rotundato, testaceo, antice nigro, 
maculis duabus paulo oblique transversis, confuse nigro-brunneis, notato ; elytris castaneo-brunneis, cum 
margine exteriore angusto, sex aut septem lineolis plus minusve interruptis, confuse testaceo-ferrugineis, 
apice rotundatim attenuatis ; abdomine nigro. Long, 54 m.m., larg. 22 m.m.” 
[A description, l.c., follows this diagnosis]. 
“ Je n’ai vu qu'un seul exemplaire de cet Hydroporus ; il fait partie de la collection du museum, ou 
il est indique comme ayant été pris en Afrique, sans autre indication plus précise.” 
Notwithstanding the locality given by Aubé, I believe this will prove to be the H. vigilans, Woll. (No. 
465).—D. 8. 
1366. Hydroporus elegantulus, Boh., Ins, Caff. I, p. 249. Caffraria. 
‘‘Ovalis, modice convexus, nigro-eneus, nitidus; antennis pedibusque flavo-testaceis ; prothorace 
erebre, evidenter punctulato, ad basin utrinque oblique canaliculato, margine vittaque media transversa, 
dorso interrupta, flavo-testaceis ; elytris profundius, seriatim punctatis, interstitiis vage punctulatis, disco 
uni-costatis, margine inzequaliter, fascia transversa intra basin maculaque parva, apicali, flavo-testaceis 
Long. 2, lat. 1 m.m.” 
| This diagnosis is followed, l.c., by a long description]. 
The species seems to be a Bidessus, near B. insignis (No. 252).—D. 8. 
1367. Hydroporus emilianus, Clk., Ann. Nat. Hist., 1862, p. 183. Mexico. 
“ Ovatus, impubescens, punctatus, rufo-ferrugineus ; capite flavo, ad medium fusco-suffuso ; thoracis 
lateribus flavo-suffusis ; elytris punctatis ; antennis rufo-flavis. Long. corp. £ lin., lat. 2 lin.” 
“‘Ovate, impubescent, thickly and finely punctate, rufo-ferruginous: head transverse, impunctate, 
glabrous, in colour flavous, the inner margins of the eyes near the base being suffused with fuscous: 
thorax transverse, the sides subparallel and constricted in front; the surface is glabrous and finely 
punctate, more distinctly near the base ; on either side of the middle, connected with the line of the base, 
is a short, well-defined, longitudinal fovea: elytra parallel, subattenuate near the apex, thickly but 
obsoletely punctate ; at the anterior margin (halfway between the humeral angles and the suture) is a 
short longitudinal fovea, corresponding in position to the thoracic fovea; the surface in colour is rufo- 
ferruginous or fuscous, the sides being more or less distinctly suffused with flavous ; abdomen and under- 
side dark fuscous ; legs flavous ; antennee rufo-flavous.” es 
This is perhaps a variety of Hydroporus affinis (No. 318).—D. 8. 
