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187
CONSPECTUS SYSTEMATICUS.
Familiæ omnes hic investigatæ ad Diptera orthorapha,
quibus characteres sequentes communes sunt, pertinent:
Pharynx alveata, marginibus lateralibus deorsura cum
carinis epistomatis concretis; musculi antliæ pharyngis
epi-stoniati atfixi.
Musculi partium haustelli omnes integumentis capitis,
nun-quam pharyngi afi’ixi.
Fam. Tabanidæ.
Caput ante sat convexum, occipite cum hypostomate
mani-festo excavato, vertice vix iinpresso; antennæ aut medio ferme
capiti aut labrum quarn verticem propiores insertæ.
Facies ab epistomate vix discreta, plana vel fornicata.
Epistoma magnitudinis mediæ, nunquam excavatum, totum
ferme corneum vel area membranacea majore terminatum;
carinæ epistomatis crassæ.
Genæ feminæ area minuta, oblonga, membranacea instructæ,
maris totæ corneæ.
Pharynx perpaulum exsertilis, fere perpendicularis, oblonga,
mediocriter excavata, ad apicem angustior, sub apicem latior,
marginibus lateralibus subparallelis, vix incrassatis, infra cum
processu carinarum epistomatis concretis; cornua pharyngis
longa, teretia, sat gracilia, sursum et paulum antrorsum
di-recta; musculi antliæ pharyngis magni; musculi laxatores
pharyngis minores; musculi protractores pharyngis breves,
tenues, trabeculis capitis atfixi; musculi retractores pharyngis
magnitudinis mediæ, tendinibus longis.
Oesophagi pars incrassata maxima, inter cornua pharyngis
sita, ante musculo constrictore anteriore, post musculo
con-strictore posteriore, musculis constrictoribus obliquis, omnibus
amplis, et aliis minoribus tecta; operculum oesophagi
maximum, superne profunde excavatum, musculis compressoribus
oesophagi duobus pianis, latis, faciei affixis; musculi
dilata-tores oesophagi maximi.
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