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208’
GYRINUS MARINUS:
Corpus elongatum, lineari-fusiforme, minute granulosum,
parcius pubescens.
Caput minutum, porrectum, cylindricum, pone antennas
paulo dilatatum, læve: occipite constricto, foramine cervicali
amplo, retro spectante: collo nullo. Anguli frontales truncati.
Clypeus concretus, basi excavatus, apicem versus ascendens,
porrectus, acute bidentatus: labro nullo. Sulci frontales
latius excavati. üypostoma concretum, impressione
trans-versa sejunctum.
Ocelli seni, laterales, congregati, majusculi, convexi,
pro-minuli: superiores ovati, subreniformes: inferiores magis
ro-tundati.
Antennæ laterales, extensæ, filiformes, longitudine
ca-pitis: radicula exserta, annuliformi: articulis sequentibus
tribus gracilibus, elongatis, magnitudine paulo decrescentibus:
appendice terminali brevissima.
Instrumenta cibaria exserta, libera.
Mandibulæ capite breviores, falcatæ, latiusculæ, acutæ,
medio denticulis nonnullis parvis, retro vergentibus, armatæ.
Maxillæ distantes, membrana articularia nulla; cardines
brevissimi, membranacei. Stipites mentum vix excedentes,
crassi, obovato-quadrati. Malæ binæ, longitudine subæquales:
exterior gracilis, conica, palpiformis, biarticulata, palpario
elongato, filiformi; interior angulatim hamata, obsolete
biarticulata: articulo priore pectinato: terminali cultriformi,
valido, sub apicem dentato. Stipites palporum maxillarium
brevissimi, annuliformes. Palpi maxillares filiformes,
quadri-articulati: articulo primo brevi: sequentibus fere æqualibus,
secundo et tertio obconicis, quarto paulo crassiore,
oblongo-ovato.
Mentum brevissimum, transversum. Ligula nulla.
Stipites palporum labialium maxillas excedentes, discreti, graciles,
conici. Palpi labiales biarticulati, articulis fere æqualibus,
priore obconico, altero oblongo-ovato, subincurvo.
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