- 3S9 
The adnlt survey indicnted that there '.vould "be scno onfbroakc in Idnho, 
Utah,., and Washington in 193S. . Grasahopperr, wore also on tho increase, in widely 
separated parts of Oregon thrcyxtening serious danar'C in 193S. 
Tho ITynphal Survey in 193 S 
. , Tho nynphal survey . in. the.sprin.^; of 193^ .ncro than l:ore .out . the predic- 
tions n.ade fro"^ tho .-dult .and cg-^ surveys m 1937« Enornous nun'oers of Mol.anoplus 
noy.io." !.nus hatched out in stuhhlo, pepper^rass prairie, and in idle or reverted 
lando in the D.-a:otas, I'ron 1,000 to S,COO per square yard wore present in nany 
places, D issortoira lonjS^ipon-ii s first appeared in nunhorr. as groat ,as 10,000 per 
square yard, Gonjrally apoaicing, rainn and inclenent weather delayed .and pro- 
lonfed h.atchin^;; over tho entire .area. 
The cnori.ous nvun'ber ^f c^frs deposited during tho f.all ^"-as due to tho pro- 
longed favorahle period for e.cg deposition. In the areas infested "by Melanoplus 
noxicanur_ and diffe rentia l is the ro.infall fcr the nonths of Septenher, Octooor, 
Novenher, and Jocerahor v;as .-^hout ^0 percent of nornal, and. the favorahle fall 
conditions per.j.itted r.n ununaal population increase through the developnent of a 
second generation, h.atching l.ate in July and in A-u,g-ast, v,'jiich reached naturity 
and depor ited eggs. The first n7;'"nphs of the second generation were ohserved on 
July 20 and f avorahlo cviposition weather continued ivatil Koven'ocr 15, a period 
of ap;;;.ro:'.in'..tely I30 d.ays. This ^yosi .iiiplo tine for the second generation to 
natxiro .and oviposit, as is shown hy the folloving record of .a fcnalo M, nexicanus. 
reared at ro on tonperatures , The total sp-nn of life for thin fen.ale was lOS days, 
3b of v/hich were required for nynph.al dovolopnent, 37 d-'^yr, f'Ton last nolt to 
depositirn r\f first e.-g pod, and 35 ^.ays frcn first to last egg pod de;;osited, in 
which period 10 pods containing a total cf 197 sggs w-^rc laid. 
In .addition to the following detailed t.al)ulations of the collections hy 
St.-tcs, a lir-t is given for each State showing the five species indicated hy these 
collectiens to "be the nost important in each ha.hitat. 
ARIZ ONA 
Of the 1,020 specinons collected Melanoplus nexicanus was the r.iost nunerous 
and H, f onur... ii i> m n was second. This is not a large enouj^h collection to "be 
reproc-nntativc of the relative nunhors of the different species occurring in the 
State, Although there -.vas a nore general distri'-^ution of gr.asshoppors reported 
in tho a^':ric-altural counties than in any previous year, t]^e infestations v;ere not 
severe or extensive. 
