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Show 122 Utah Academy of Sciences, Arts and Letters [Vol. XIV, An N. a.zterna_ta was observed to be feeding upon an adult E. tenellus a Russian thjstle plant at three I"?i1s southwest of Lampo, July 12, 1935. Labor<:tory cage tests (Table 3) indicate that N. alternata compares fa vorably with N. [erus as a predator of E. tenellus, Several thousand N alternata per acre would be a low estimate, on many desert breeding grounds of the beet leafhopper. under Fig. 6 Adult N abis alternate Parsh. Geocoris decoratus, is Geocoris decoratus Uhler.-The big-eyed bug, and on some desert breeding grounds, present almost every year in abundance other crop and many in moderate abundance in fields of beets, tomatoes, on decoratus has been observed feeding plants. On a number of occasions a observed was this instances in the field. In a few an adult or nymphal tenellus tenellus. victim being dark overwintered female to occur in early spring, the series of cage experiments were In view of such field observations a large that Such tests (Table 4) indicate more fully set up in the laboratory. espe down tenellus populations, decoratus is capable of consistently cutting and may occurs in considerable abundance, beet the leafhopper where cially field. the in case the is be readily captured, which frequently tenellus in cages were ob Numerous instances of Geocoris feeding upon the the leafhopper only by served. Frequently the predator was holding rest was the predator in a majority of the cases, stylets of the rostrum, and the leafhopper to dangle suspended allowing elevated point, some ob ing upon In most of the cases labium. in space from the end of the predator's rush and quickly beak its its prey by extending served, the Geocoris captured become entangled the stylets often appearing to the leafhopper, against ing |
