relative distribution and occurrence of several hundred species of plants on the several types of prairie Y/as of great service in lining up the cocEiunities. Hayden (1919) recorded the floristic features of a prairie province in terms of ecological connromities. This province, two miles north of Ames, was stud ied intensively by the author to partially guide his observa tions at other stations. Some of the comnanities such as the Bouteloua hirsuta-B. curtipendula association and the Stipa spartea-Andropo^on scoparius association ivere no longer very extensive in area because of the extensive tillage and pasturage of such lands in the state. The comiaunities on lower and rougher ground T/ere much more numerous and more extensive. • Other communities such as Buchloe dactyloides-Bouteloua hirsuta association of G-itchie Hanito State Park may Tjndoubtedly occur, but they were not seen in tracts of sufficient extent to permit of the col lection of typical insects from them, Methods of Collecting Insects Several stations T/ithin one hour's driving distance of Ames were visited one to several times each T/eek from about the first of March until ITovember, or until mo^Tn in the later part of August, during the years 1925 to 1928, inclusive. At these stations basic collections were made at most of the plant coinmunities of this study. Except at the most distant situ ations collections v/ere made at other stations each month from i At all Andropogon coiainunities. Earliest adult, July 24, I I 1928; latest adult, Aug. 5, 1927. Hot numerous, Phoetaliotes nebrascensis Thorn. The author (1928) records this species from a Stipa-Bouteloua consmmity, and it is probably most numerous at the Bouteloua hirsuta ~ B. curtipendula association. Arethaea gracilipes constricta Brunn. At Andropogon scoparius ~ Bouteloua curtipendula associ-28ation,. 1 ni. west of Hamburg State ParlCj July 50, 1928, quite cosHiioii. Scudderia tesensis S, P. Andropop;o3i farcatus-Spartina Mcliausiana associes.

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Late in the summer of 1926, several adults of the beetle (Microrhopala vittata Fabr.) were found in the blistered portions of leaves of the compass plant (Silphium laciniatum L.). The insect is black with head and thorax red and with red stripes on the second costa and at the outer margin of each elytron. It is subdepressed and about 6 mm. long.

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