. Bulletin. Natural history; Natural history. 138 Illinois Natural History Survey Bulletin Vol. 27, Art. 2 species occur. In 1932 Morgan Hebard of the Academy of Natural Sciences of Philadelphia offered to prepare an account of the Dermaptera and Orthoptera of Illinois. For this project staff members made additional collections in areas of the state not previously covered for the group. The report appeared 2 vears later (Heb- ard 1934). Aphids.—This group was one of the Hrst emphasized in studies by the Natural History Survey's parent organizations. Thomas, one of the leading early investi- ga
. Bulletin. Natural history; Natural history. 138 Illinois Natural History Survey Bulletin Vol. 27, Art. 2 species occur. In 1932 Morgan Hebard of the Academy of Natural Sciences of Philadelphia offered to prepare an account of the Dermaptera and Orthoptera of Illinois. For this project staff members made additional collections in areas of the state not previously covered for the group. The report appeared 2 vears later (Heb- ard 1934). Aphids.—This group was one of the Hrst emphasized in studies by the Natural History Survey's parent organizations. Thomas, one of the leading early investi- gators in the taxonomy of this group, pub- lished a synopsis of one of the tribes and described many new forms from Illinois (Thomas 1878). About the same time Nettie Aliddleton (1878) described an- other species, and several years later C. M. Weed (1891) published the results of his studies on the life histories of a number of species. Little more was done with this group until J. J. Davis started further taxonomic investigation of the aphids about 1908. In the Bulletin, Davis (1913) published a commentary on the Cyrus Thomas collection and in addition 20 papers on aphid taxonomy in various entomological journals. Most of this work he did while an assistant in the State Entomologist's Office. In 1928 Prison and F. C. Hottes, the latter now at Grand Junction, Colorado, took up a study of Illinois aphids. This was the first study to be based on a com- bination of intensive collecting for one group and opportunities for rapid travel to all parts of the state. Field investi- gations were made during the summers of 1928-1930. Each year collecting parties started in the southern part of Illinois and worked north and then reversed the pat- tern so that each locality was collected at different seasons. A complete set of slide mounting equipment was taken into the field, and temporary headquarters were I. An Illinois Natural History Survey entomologist making field notes relating to in
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