NO. 1124. REVISION OF Tni: AiKLAXorLi—s(ri)i)i:ii. 145 



the fnrcula longer tban the last dorsal segment, and the lateral margii* j 

 of the subgenital plate slightly elevated apically. 



The species, six in number, are evenly divided between macropierons 

 and brachypterous forms — and this is the only homogeneous series of 

 Melanoplus in which they are so — of small or rather small size, and are 

 found only in the district to the west of the Mississipi)i aiul mainly in 

 the Cordilleran region. They have not been reported north of the 

 United States, and a single species has been found to extend souili of 

 our boundary in nortiiern Mexico; while another species is known only 

 from California and is the only one occurring west of the Sierra Nevada, 

 (the same species, M. rtleyunuaj mentioned above). 



4. MELANOPLUS OCCIDENTALlS. 

 (Plate X, tig. 4.) 



Caloptenus occidentalis Thomas I, Ann. Rep. U. S. Geol Surv. Terr., V (1872), p. 453, 

 pi. II, Hg. 2.— Glovek, 111. X. A. Ent.,()rtli. (lS72),pl.xi,tig. 2.— Thomas!, 

 Rep. U. S. Geol. Surv. Terr., V (1873). p. 161; f. Rep. Geol. Geogr. Surv. lOOth 

 mer.,V (1875).p. 8;>3;?, Proc. Dav. Aca<l. Sc. I (ls76), p. 2(jl.— S{ udder, Hull. 

 U.S. Geol. Surv. Terr., II (1S7()), p. 261.— Thomas, ibid., IV (1878), p. isi.— 

 Bruner, Cau. Ent.. IX (1S77). p. 145.— Thomas. Rep. U. S. Ent. Coinni.. I 

 (1878), p. 43.— Brixkr. Bull. Div. Ent. U. S. Dep. Agric, II (1883), p. 9; ibid.. 

 Ill (1883), i». 60. 



Melanoplus lariolosiis ScudderI, Proc. Bost. Sor. Nat. Hist., XX ; 1?<7}»). pp. 67-68; 

 Ceut. Orth. (1879), pp. 56-57.— Brunei;. Rep. U. S. Eut. Coiuni.. Ill a883) 

 p. 61. 



MflanopliiB occiiUntalis Briner, I'ubl. Xebr. Acad. Sc, III (1893), p. 28. 



Of medium or rather small size. Head very slightly elevated, a very 

 little arched; fastigium rather shallow, particularly in the female, the 

 margins in front of the eyes blunt, gently diverging and then converg- 

 ing, but in the female subi)arallel ; interspace between the eyes as 

 broad (male) or half as broad again (female) as the tirst antenna! joint; 

 frontal costa more than usually prominent, about as broad as the inter- 

 space between the eyes, scarcely contracted above, scarcely enlarged 

 ar the 0( ellus, at and below which it is somewhat suicate; ejes rather 

 prominent, anteriorly truncate; antennae somewhat more (male) or 

 slightly less (female) than three fourths as long as the hind femora. 

 Prouotum enlarging on the metazona, laterally subtumid in an irregu- 

 lar way on the prozona, the metazona faintly punctate; front margin 

 feebly convex, with a feeble median emargination ; hind margin roundly 

 oljtusangulate; median carina distinct on the metazona. faint on the 

 IMozona, obsolete between the sulci; sides of the pronotum hardly 

 shouldered or with very rounded shoulders; transverse sulci of pro- 

 zona pretty distinct and continuous; prozona iMigitudinal, a little 

 longer than the metazona (male) or transverse, no longer than the 

 metazona (female). Prosternal spine rather short, appressed conical, 

 broadly rounded at tip, a little retrorse; interspace between mesoster- 

 iiul lobes about half as long again as broad (male) or transverse (female). 

 Proc. N. M. vol. XX 10 



