7G rn(>ci:i:Dix(is or the xational mfsevm. vol.xx 



tance; fiiTcula consisting of a pair of adjacent, obtusely anglcu, scarcely 

 piqjectinj:', small lobes; cerci long and slender, fully as long as the 

 sui)raanal plate, tapering not rajjidly and on the basal half only, the 

 apical half slender, a little compressed, slightly arcnate, and feebly 

 downcurved apically; subapical tubercle of subgenital plate moderate, 

 suberect, as viewed from behind very bluntly conical. 



Length cjf body, male, IS mm., female, 2.5 mm.; antennae, male, 7.2.") 

 mm., female, 7.8 mm.; tegmina, male, 10 mm., female, 13 mm.; hind 

 femora, male, 9.5 mm., female, 12 mm. 



Nine males, fi females. Yellowstone, Montana, October 0. C. V. Kiley 

 (I\S.y.M.); Sweetwater, Wyoming, Thonms fU.S.X.M., [No. 715|): 

 Wj'oming, ^lorrison (U.S.N.M.); Newcastle, Weston County, Wyo 

 ming (L. IJruner); Gordon, Sheridan County, Nebraska, August (L. 

 Bruner); Explorations in the ITpper Missouri and Yellowstone, V. V. 

 Hay den. 



The species was originally reported from ''between Red Buttes and 

 IndcixMideiice Kock, Wyoming," but it has since been recorded by 

 Bruner (doubtless in some cases by mistake for some of the allied spe 

 cies here tirst separated) from (iarden City, Finney County, Kansas, 

 western Nebraska, Arizona, New Mexico, Montana and the Pacitic 

 Coast. 



According to T»runer, this species in the Y^ellowstone region "only 

 feeds upon two species of ])lants, as nearly as I could ascertain by 

 observation, viz., the •i)igweed' and a small greenish white plant of a 

 similar nature. Those found on the pigweed are somewhat glaucous 

 yellow, while those feeding on the other plant are more of a whitish 

 color, mingled with greenish blue instead of greenish yellow,"' the color 

 of tiie insects resembling to a considerable degree that of the plants 

 on which they feed. 



7. AEOLOPLUS PLAGOSUS. 

 (Plate VI, iijr. i.) 



PezotetUx phio^sm ScuddekI, Auu. Kej). Chief Eng., 1876 (1877), p. 504; Can. 

 Eut.,XII u889), p. 75. 



Brownish vellow marked with dark brown or brownish fuscous: 

 especially noticeable is a dark meoiodorsal stripe, extending from tne 

 iniddle of the vertex between the eyes, where it is not half so broad 

 as the interspace, to or nearly to the posterior end of the ])rouotuiii. 

 bjoadening as it goes, on the posterior half of the i)roni)tuni inclosing 

 a median jiale line and fading out before the end of the metazona; 

 theie is also a broad dark belt at the upper limit of the lateral lobes on 

 the prozona. extending forward to the eyes and fading inferiorly; inter- 

 space between the eyes slightly broader than tlie tVontal costa, the fas 

 tigium broadly and rather shallowly sulcate, the frontal costa erpia!. 

 narrowly sulcate below the ocellus. Pronotum broadening slightly 

 posteriorly, the metazona punctate, the median carina distinct only 



