Full-text - Norsk entomologisk forening

452 Johan Andersenvery slender; first joint four times as long as broad, second joint2.5 longer than broad. Outer lobe (Fig. 40) slender too, terminaljoint somewhat longer than basal joint. Labial palpi: Fig. 41.DiscussionThe description of the species of Chrysobracteon reveals thatthe larvae in the second and third stages of Bembidion andAsaphidion Gozis cannot be separated according to the key ofEmden (1942). Using the key the second and third stage larvaeof B. argenteolum would be placed in the genus Asaphidion,whereas B. litorale and B. lapponicum have characters in commonwith both the genera. I have myself reared the third stagelarva of Asaphidion pallipes Dft. but am not able to find anysingle character which, alone, distinguishes it from all the knownmembers of Bembidion, and the same may be concluded fromthe description of Baving (1911). (The Asaphidion larvae describedby Bprving obviously are A. pallipes, not A. flavipes L.as believed by the collector, see Larsson (1939)). Yet the onlydistinguishing character for the two genera is the appearance ofthe eggbursters in the first stage larvae, but that feature, ofcourse, is not applicable to the second and third stage larvae.Obviously the two genera are closely related and more toeach other than to Tachys. Until other distinguishing charactershave been discovered - if they exist - it would be more practicalto separate the species of Asaphidion and Bembidion inone key rather than to try to separate the genera entirely. Manyof the Bembidion species are still unknown. However, from thedescription of Larsson (1941), members of many of the subgeneraare known, and I have myself reared larvae of the subgeneraSemicampa Net. and Plataphus Motsch.The known Bembidion and Asaphidion species differ fromTachys according to Emden (1942). Asaphidion and the subgenusChrysobracteon differ from all the other Bembidion by thebroader head (ee:OO 2 0.80, in other Bembidion species:ee:OO 2 0.85). If there is any doubt the second joint of themaxjllary palpi is not twice as long as broad, whereas it is morethan twice as long as broad in other Bembidion species.The third and second stage larvae of B. argenteolum are easilyseparated from the other Chrysobracteon and Asaphidion species(and probably from all other Bembidion species too) by the largenumber of setae on the frontal piece, thorax and abdominal tergites,by the pale colour and the broad, marked nasale. Thesame stages of B. lapponicum and perhaps B. velox are characterisedby the colour on the head and pronotum and by thevery narrow nasale. B. litorale is separated from the last two