772 On Aquatic Carnivorous Coleoptcra or Dijtiscidce. 



1280. Cybister marginicollis, Boh., Ins. Caff. I, p. 235. South Africa. 



" Ovalis, depressiuscuhis, postice magis dilatatus, ad apicem nonnihil rotnndatus ; nitidu.s, supra 

 atro-cseruleus, subtus nigro-piceus ; antennis, Libro, cpistomate pedibusque luteis ; prothorace angiiste 

 luteo-marginato, dorso siibtilissime, longitudinaliter aciculato, lateribus confertiin jnmctulato ; elytris 

 triseriatim punctatis ; margine inflexo ferrugineo. Long. 17, lat. 10 m.m. Hab., ad poilum natalense." 



[.I descriptio7i, I.e., /allows this diagnosis']. 



It is probable that the species is closely allied to Cybister filicornis (No. 1129). — D. S. 



1281. Cybister olivieri, Crotch, Tr. Am. Ent. See. IV, p. 399. North America. 



" Very near C. fimbriolatus but smaller, vnth the thoracic and elytral margin narrower, the elytral 

 vitta leaves the margin gradually, and is attenuated at about three-fourths. L. 1-10 inch." 

 " Mas, stridulating plate with three vug*. Fern., elytra smooth." 

 " Florida." 



According to a female recently communicated by Dr. Leconte to me, this does not belong to Megadytes, 

 but is a Cybister unknown to me, and of very doubtful position. — D. S. 



1282. Cybister prosternovii-idis, Orm. Eev. Zool., 1843, p. 331. South America. 



" Ovalis, convexus, postice dilatatus, ad apicem rotuudatus et depressiusculus, nitidus, supra olivaceus, 

 infra niger. Labro ferrugineo, thoracis lateribus viridis, in elytrorum margine viridis, prosternum 

 viridis, pedibus anticis nigro-piceis, posticis nigris. Mas, elytris IfeNabus. Femina. L. 36 1 1., 20 

 mill. 



" II habite le Bresil 1" 



No comparison with auy other species is made, and as the locality is doubtful, the species will not 

 easily be identified. I do not think it would be really from Brazil, and should suspect an African 

 species may be intended. — D. S. 



1283. Cybister vulneratus, Klug, Symb. phys. IV, \A. 33., f. 1 (the letter-press is not numbered). 

 Arabia. 



" Cybister niger, thorace lateribus, elytris (in mare lievibus, remote punctato-striatis, in femina dense 

 aciculatis) macula jjostica sanguineis. Long. lin. 12. Habitat in Arabia deserta." 



" Statura fere D. immarginati. Fab. at angustior ac dimidio fere minor. Obscurus, niger. Caput 

 obsolete rugosnm, subalutaceum, ore antennisque testaceis. Thorax subrugosus, subalutaceus (in femina 

 aciculatus) antice late sinuatus, postice obsolete bisinuatus angulis productis, lateribus obliquis, vix 

 rotundatis, parum reflexis, late obscure sanguineis. Pectus abdomenque hevia. Abdominis segmenta 

 intermedia puncto utrinque sanguineo. Segmentum ultimum apice obscure sangiiincum. Pedes : 

 Trochanteres anteriores toti, postica apice ferruginei. Femora anteriora apice Inete ferruginea postica 

 obscure sanguLnea. Tibia; anteriores (in mare cum tarsis) rufo-testace<e, iutermedise extus sanguinete. 

 Tarsi postici dense fernigineo-ciliati. Elytra thorace ])lus quadruple longiora, ante apicem parum 

 dilatata, lateribus marginata, in mare huvia, in femina dense aciculata, lineis punctorum impressorum 

 ad basin approximatorum tunc remotorum tribiis instructa maculaque pone apicem ad margiuem externum 

 elongata sanguinea ornata." 



I think this is probably one of the forms of Cybister binotatus, Klug. (No. 1 133.) — D. S. 



1284. Cymatopterus obscuratus, Mann., Bull. Mosc, 1853, III, p. 154. Russian North America. 



" Oblougo-ovatus, ultra medium valde ampliatus, jiosterius modice attenuatus ; supra nigro-fuscus, 

 aubtus cum pedibus aterrimus : labro, frontis margine antico late bisinuato, maculis binis obsoletissimis 



