137 



\l<:. 121. 

 Natural (*ize 



'J'hc Olive Grawjhopper, Melanriplu* difJererUi'd'i.ii. 



(Acrididf/;) the latter rnay bo known by thf; lack of Htrikin;^ colors on 



their hind wingH. T}io upper wingH arc never conHpieuonHly variej^'ated, 



although in hiviWituH (Fig. 122; a yellowi.sh stripe run.s along the anglf; 



of the wing, and the 



under wings are clear 



or very faintly tint<;d 



— never in part yellow, 



red, or black, a,s they 



are in other members 



of the family. 



The first throe spe- 

 cies of thf; aljove list (femur-^iJ/rurn, atUmis, and ftj/relun) arc about an 

 eighth of an incli thick at.'the base of the wings, dull brownish in 

 cf»lor, with a line of dark specks on 'the middle of the wing-covers. 

 The- remaining two (difjarentmlu and himtUiiuH) are about a fourth r,f 

 an inch through the body at tlie base of the wings. DifferenlMiH Cl-'ig. 

 121) i.s fiull greenish, with yellow tibia;; and UmUMuH (Fig. 122j has 

 a yellf>wiHh ntripe along each side of the back. The western, typical 



form of the latter has the 

 tibiaj yellow, but the eastfjm 

 variety (fernoroius), the com- 

 mon form in Illinois, has 

 bright red tibia;. 



Melriru/pluH jemur-rvhrum 

 (Fig. ] 23j is by far our com- 

 monest species of grasshop- 

 f;er. Atl/mis (Fig. 124) rc- 

 place^s it on dry hillside slopes. 'Jhf; Rocky Mountain gTa.sshof;per, 

 Hf/rduH (i^'ig. 125, 120), is a migratr^ry specjes, having its home within 

 the lirjcky .Mountain rai^^um, horn which it has descended in swarrns 

 uf)on the plains of the eastf;m slope; but this invasion is only t<;rnpo- 

 rary, the species quickly dying out in this region. M. jemMr-ruhrurn 

 f;losely resembles atUmtH and HjrrduH. Tlie rnaU^s of thc^se three species 

 are readily distinguished by the structure of the la.st segment of the 

 abdomen, in fem/ar-ruhrum i}i(: i\]) }\hh ^ 



a smooth rounded edge; in afMnin it 

 is point/;d above, with a notched apex; 

 in HyrHuH it ends more squarely, with 

 two rnorf; widely ftepamicA points. The 

 females show no marked differences 

 in this segrnrint, and are separable only 



by a number r>f |r;ss definite charactx;rs found in fK^th nexdH. Fernur- 

 ruf/rum is not very closely related U) atlantH, and is usually readily distin- 

 guishfjd from it. The finger-like projection just back of the'rnouth, 



Fio. 122. 'i'hd TwoHttriped Graxffliopper, MeUinf/pluii 

 hlmtUiluii. ,\'atural «ize. (Kilcy, U. H. Dbfit. of Akh- 

 culturfc.) 



m^\ 



I'if>. 123. Tlie UfA-U;HKf-'i O r a » » - 

 lioppfsr, M KUinojilvH ^f.mur^vJrrum. Nat- 

 ural w/.c. 



