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Bibio nigriventris Haliday, 1833 (Dipt. Bibionidae) inNorwayUTA GREVEGreve, L. 1987. Bibio nigriventris Haliday, 1833 (Dipt. Bibionidae) in Norway. Faunanorv. Ser. B 34, 31-34.A total of 316 specimens ofB. nigriventris Haliday, 1833, based on old revised and newcollections, have been recorded from around 70 localities. The distribution of B.nigriventris in Norway is given. B. nigriventris is common in the lowland north toTroms province, and is probably one of the most common species of Bibionidae inNorway. The species has been collected up to 900 m a.s.l. which belong to the subalpinezone, but it seems to be rare here. Most records are from mixed coniferous anddeciduous forests.The flight period is late May to July in the lowlands, except in the two northernmostprovinces where the flight period is June to early August. The few records from thesubalpine zone dates to late June and July. The sex ratio in all the material is I : I, but inMalaise traps the sex ratio changes towards 2 males per I female.Uta Greve, University of Bergen, Zoological Museum, Museplass 3, N-5007 BergenUniv., Norway.INTRODUCTIONHackman (1980) listed eleven Bibio, one Dilophusand one Penthretria from Finland,Adult Bibionidae are common in many partsofNorway. Several species make swarms andand Wahlgren (1919) listed thirteen Bibioare then easy to capture. Few researchers, and three Dilophus from Sweden. Comparedhowever, have studied this fly family in Nor­ to these lists the number of Bibionidae inway. The last survey dates back to SiebkeNorway can be calculated to be roughly fif­(1877). Bibionidae larvae feed on different teen, but only the seven specificly mentionedplant roots, and some are pests on agricultutreatedhere, are recorded with certaintyabove and B. nigriventris Haliday, 1833,ral crops.Two species of Dilophus and thirteen spefromsouthern parts of Sweden (Wahlgren,from Norway. B. nigriventris is mentionedcies of Bibio (= Hirtea) was listed by Siebke.Older material ofDilophus should be revised 1919), and it is listed by Hackman (1980).on account of Haenni's (1982) revision. More information on the European distrib­Greve, Solem & Olsen (1984) found D. femo­utioratus Meigen to be fairly common in Norway.is given by Verbeke (1971).B. clavipes (Meigen), B. fulvipes Zett., B. pomonae(Fabr.) and B. rufipes Zett. were fo­ MATERIAL AND METHODSund to be common at Kongsvoll, Southern A total of 316 specimens of B. nigriventris.Tr0ndelag province (Greve, Solem & Olsen, 158 males and 158 females were collected1984). Greve (1986) mentioned two more from around seventy localities. All materialBibio species from Norway, B. hortulanus (L. hitherto determined and recorded as B. nigri­1758), included in Siebke's survey, and B. ventris in Norwegian museums is included inmarci (L. 1758) as new to Norway. B. umbel­this survey. Material is for the main part de­latarum Zett in list probably represents a sy­ posited in Zoological Museum, University ofnonym for B. fulvipes Zett.Bergen. Material deposited in museums el­Freeman & Lane (1985) listed a total of sewhere is notified in the list of records.twenty species of the genus Bibionidae from There is little information on collectingthe British Isles - sixteen belonging to the methods, but one can assume that most of itgenus Bibio- and four to the genus Dilophus. has been collected by a sweep-net. Much ad­Fau1lLl norv. Ser. B. 34: 31-34. Oslo 1987. 31