Investigations on Diprionine sawflies.
The numerous observations recorded in this paper were made in Pine stands in Mecklenburg in 1937-40 largely by means of an outdoor insectary and cages fixed to the trees, and the results are compared with those of other workers. The species observed were Diprion similis, Htg., D. pini, L., Gilpinia (D.) pallida, Klug, G. (D.) socia, Klug, G. (D.) virens, Klug, G. (D.) frutetorum, F., G. (D.) laricis var. fenestrata, Ensl., G. (D) variegata, Htg., Neodiprion (D.) sertifer, Geoffr., and Macrodiprion (D.) nemoralis Ensl. That studied in greatest detail was D. similis which is considered to be characteristic of the group. Natural enemies of the various stages of the sawflies are also discussed at some length. KEYWORDS: