NORSK ENTOMOLOGISK TIDSSKRIFT - Norsk entomologisk forening

10 Gudmund Taksdal
numbers of bug species on native trees were collected from
Quercus robur (14) and Ulmus glabra (ll), while the highest numbers
on introduced trees were collected from Salix aLba (6) and
Tilia euchlora (5). The genera of the last two species mentioned
also include trees which are native to Norway. No such relationship
exists for the two introduced trees on which the lowest
numbers of bug species were found, Juglans cinerea (I), and
Aesculus hippocastanum (0).
Thus the data appear to be in good agreement with Southwoods
(loc. cit.) hypothesis, but the material is limited, and the
tendencies should, therefore, be regarded only as preliminary
indications. - The park at the college with its high number of
introduced and native trees and shrubs seems to be well suited
for studies of this kind, and collecting will be continued with
this in mind.
References
GYLLENSVARD, N. 1963: Nggra for Sverige nya eller sallsynta hemiptera
11. - Opusc. Ent. 28: 198-200.
HAFSTEN, U. 1956 : Pollen-analytic investigations on the late Quaternary
development in the inner Oslofjord area. - Univ. Bergen Arb.
1956. Naturvit. R. Nr. 8, 161 pp.
KRUSSMANN, G. 1960: Die Nadelgeholze. 355 pp., Berlin.
- 1960-62. Handbuch der Laubgeholze. 495 + 594 pp., Berlin.
SOUTHWOOD, T. K. E. 1960a: The evolution of the insect - host tree
relationship - a new approach. - XI. Intern. Kongress f. Ent.
Verhand., Bd. 1: 650655.
- 1960b: The abundance of the Hawaiian trees and the number of
their associated insect species. - Proc. Hawaii. Ent. Soc. for 1959:
299-303.
SOUTHWOOD, T. R. E. 1961: The number of species of insect associated
with various trees. - Journ. Anim. Ecol. 30: 1-8.
- and D. LESTON, 1959: Land and water bugs of the British Isles.
436 pp. - London and New York.
- - 1964 : Order XIX : Hemiptera : Suborder : Heteroptera. In:
Kloet. G. S.. and W. D. Hincks: A check list of British insects. -
second ed. Part 1. 119 pp. London.
STICHEL. W. 1956-58 : Illustrierte Bestimmunastabellen der Wanzen
11. Europa. Vol. 2. 907 pp. ~erlin-~ermshorf.
WARLOE, H. 1924: Fortegnelse over Norges Hemiptera Heteroptera. -
Videns. selsk. Forh. for 1924 No. 4. 42 pp. Kristiania.