. Annual report. New York State Museum; Science. INSECTS AFFECTING PARK AND WOODLAND TREES 139 more general in the vicinity of the grounds of the Department of Agricul- ture, where most of the observations were made, than in other portions of the city. The difference due to locality is also shown by the parasites' in the state collection reared by the late Dr Lintner from this species, though his study of them was by no means so extensive as that at Washington. The one occurring most abundantly was Tachina mella Walk. Pimpla hirticauda Prov., a species not reared at Washington from this insect
. Annual report. New York State Museum; Science. INSECTS AFFECTING PARK AND WOODLAND TREES 139 more general in the vicinity of the grounds of the Department of Agricul- ture, where most of the observations were made, than in other portions of the city. The difference due to locality is also shown by the parasites' in the state collection reared by the late Dr Lintner from this species, though his study of them was by no means so extensive as that at Washington. The one occurring most abundantly was Tachina mella Walk. Pimpla hirticauda Prov., a species not reared at Washington from this insect, was bred in greater numbers than any other of the larger hymenopterous parasites. Most of the individuals belonging to this species were reared in July, but two appearing in June and a few others in Fig. 21 Dibrachys boucheanus: <i—larva; <—pupa; f—adult female—greatly enlarged; rf=head of larva; <?—antenna of adult — still more enlarged. (After Howard, U. S. Dep't Agric. Div. Ent. Tech. Ser. 5, 1897) Pimpla inquisitor Sa)', P. c o n q u i s i t o r Say and P. a n n u 1 i p e s Brulle occurred in about equal numbers. Of the smaller primary parasites Pteromalus cuproideus How. and an unnamed species belonging to the same genus were about equally abundant. Though the list of primary parasites is long and includes some very important species, many of these are in turn the victimis of enemies. The parasites breeding in those which prey on injurious forms must be classed as enemies to man, since they indirectly protect a species injurious to his interests by destroying large numbers of its parasites. One of the most 'Determined through the courtesy of Dr L. O. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State Museum; University of the State of New York; Metcal
Size: 2262px × 1105px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
