. Bulletin. Natural history; Natural history. M;iv, 19(i8 Tiirtp: II I IN'OIS 237. Fig. 33.—Type of research microscope needed for the study of Thysanoptera. Photo by Wilmer Zehr. fication) objective and with a liglit source that can be adjusted for Kohler illumination is necessary for the study of Thysanoptera. A hand lens of 20 power magnification is useful in mak- ing observations in the field. Not all thysanopterists are in agree- ment on every phase of collecting or mounting thrips, or even in storing the slides. The search for the perfect mounting medium still goes on. Mean- while, howev
. Bulletin. Natural history; Natural history. M;iv, 19(i8 Tiirtp: II I IN'OIS 237. Fig. 33.—Type of research microscope needed for the study of Thysanoptera. Photo by Wilmer Zehr. fication) objective and with a liglit source that can be adjusted for Kohler illumination is necessary for the study of Thysanoptera. A hand lens of 20 power magnification is useful in mak- ing observations in the field. Not all thysanopterists are in agree- ment on every phase of collecting or mounting thrips, or even in storing the slides. The search for the perfect mounting medium still goes on. Mean- while, however, the major collections of Thysanoptera in the world are com- posed primarily of specimens pre- served in balsam on 3- by 1-inch, 1 mm thick slides, stored in boxes or trays. Such unifoi'mity allows much convenience in exchanging specimens. In learning to recognize the subtle features of many of the genera and species of thrips, it is advantageous to have a named reference collection available. Lacking access to such a collection, a helpful series of speci- mens can be gathered from hosts known to harbor specific thrips. In this manner representatives, especial- ly of the Terebrantia, can be obtained quickly and identified with reasonable assurance of accuracy. The following partial list should aid in this regard: Plant Hosts of Thysanoptera of Illinois Terebrantia Aeolothrips pittatiis conifers Aeolothrips locust trees Heterothrips aesculi red buckeye flowers Heterothrips wild rose flowers Heterothrips arisaemae jack-in-the-pulpit flowers Heterothrips auranticornis flowers of sunflowers, autumn Heterothrips azaleae. .flowers of azalea Heterothrips quercicola. . oak catkins Heterothrips salicis male catkins of sand bar willow Heterothrips vitis opening buds of grape flowers Anaphothrips sandersoni heads of slough grass Caliothrips striatus leaves of yellow poplar Ctenothrips bridwelli leaves of may apple, skunk cabbage Dendrothrips ornatus leaves of
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
