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Show 130 Utah Academy of Sciences, Arts and Letters [Vol. XIV, The land at this place slopes principally to. "the northeast. The dominant vege tation here is shad scale, Atrilex confertifolia, with blistercress, Cheirinia re panda, germinating in fall and spring on the roadsides, bare spots, and at times among the scrubby vegetation when moisture permits. A fringe of Russian thistle, Salsola pestifer, grows along the. sides of the highway, widen ing out in spots where the ground has been disturbed. In this area, severe drought at times nearly wipes out the beet leafhopper host plants. During other years conditions are favorable for breeding and high tenellus populations develop;' this was particularly noticeable in 1929, when more than 2000 tenellus were collected in 50 sweeps of an insect net on one occasion during October, as shown by Knowlton (17), who briefly dis cussed this area for the years 1929-1931, and figured the seasonal abundance of the beet leafhopper upon Russian thistle. The beet leafhopper population again was rather low in this -area during the seasonsof 1932 and 1933. During the years 1930 to 1933, inclusive (Table,"! 5) 390 lizards were col lected, as opportunity afforded, upon an area of three-fifths of an acre, along , Table 5. Uta stansburiana stansburiana and Euietti» tenellus record 6 miles northwest of Delle, 1930-1933, summarized by month (1) and year (2). at No. Lizards taken No. near E. tenellus Containing Hosts E. tenellus Adults Nymphs Total May 6 6 1 1 0 1 June 67 63 0 0 0 0 July 10 10 6 8 0 8 August 83 83 42 132 65 197 September 204 204 70 138 284 422 October 20 20 19 38 262 300 390 386 138 317 611 928 1930 42 42 40 99 262 361 1931 151 151 35 80 56 136 1932 94 94 52 130 274 404 1933 103 99 11 8 19 27 390 386 138 317 611 928 Month ( 1) Totals Year Eutettix tenellus No. (2) Totals |
