D-arin{>: the sumner tliore Yvore fe-/Vor fli-^^htn recorded than in 193^, \vhich 
prol^ahly dcae to the cooler weather .and "better food conditions. In the 
Dissogteira lonf-jipcn nis arer-.s thin sijecios v/ac nigratin^r foot or wing iron 
hatching tine imtil the females had, settD.el down to egg dejiccit ion. Sonc 3 or U 
million acr^s ".'ero involved in Colorado alone. Me Ian op]. -us n c:-:ican-a?'- spread over 
33 counties east of the Missouri Hiver in South DrJcota fron the -3 counties in the 
northenstern quarter and from local infestations; however, for th.e nost part, 
migrations wore from "breeding grounds to adjacent crops* 
G-enoi»a.Hy speaking, disense, parasites, a,nd o.-'g predators capparontly did 
not reduce populations to any great degree during th^^ sunn^r. In some areas 
sarcophagid flies were a minor factor. During the egg survey heo fly, "blister 
"beetle, and carahid larvae were numerous, with from ^0 to 70 percent of the egg 
pods attacked in some pl?.ces in Missouri, Iowa, and Minnesota. I\ingu.s disease 
occurred only occasionally. 
Eggs of all species -v/ere, in gen';rrl, easily fr^und and well distri"buted 
over the entire region. In .a few States, including Montana, Wyoming, Illinois, 
Kansas, and lTe"braska, infestations ore eqi-.al to or somev/hat less than last year 
(1936)0 In many of the oth':r States infestations are more widespread and m.ore 
severe than they hfive "been for several years. They increased in northern 
Michigan, all of Wis cons ir, and in the southern half of Minnesota„ The most 
severe infestations were found in Iowa, northern Mis -.our i, and east of the Missouri 
River in North Dalcota and South Dal^ota, Egg pods of Melano plus d if f erontialis 
ranged from 25 to 100 per square foot in many places in Iowa, and Missouri, Other 
species were also numerous. One of the most startlin:'; facts was the fir.ding of 
egg pods, mostly M, muxicc^nu s,, at each of 266 stops made in 33 counties east of 
the Missouri Elver in South Dakota. At 26U of those, 5 squarOi-f oot samples were 
taken from within each field, or a total of 1,320 squar-:'-f oot sanplos« Egg pods 
were found in 1,23S of them., or in I5 out of 16 squai'c-»f oot samples. In southern 
Wisconsin egg pods of M elanoplus f b r.ui ' ^ ruh rum ranged from. 4 or 5 l^r square foot 
in upland pastures to 6 or C in the "l^ottom Irjids, 
Infestations increased in the delta section of Arkansas, overm. ost of 
Oklahoma, and in from 60 to SO counties in northwestern, northern, and central 
Texas. In northeastern New Mexico there were koO or 5OO egg "beds of Dissosteira 
longipon nis frcm k to 10 acres in si?.e, with fro.m E to 30 pods per square foot. 
The average infestation in Arizona was a'nout the same as in 193^, although there 
were shifts within the Strte, 
In Colorado D, longipen nis comr..anded the most inter est. In the spring of 
1937 it MP.s estimated that 3,^^0,000 a.crcs v/as infested at hatching time in S 
southeastern counties, wheroas in the fall it was estimated that there were 
^,025,760 acres of "breeding areas in 12 count i'-^s, only U of rh ich contained egg 
"beds in the spring. Eight now counties "became infested hy D. lO'igipennis during 
the season, while four 01 the counties having Infestations last year y;ere not 
included in the area in which egg heds were found in the fall, Ouinfr, to the great 
migrations of adults the infested ojea was almost directly west of where D, 
longipennis hatched the previous spring. Other species were also a"Dundant in { 
the irrigcatod sections of the State, j 
