84 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



teriorly obscurely transversely rugulose, scutellum very large, broadly 

 triangular. Elytra long and narrow, overlapping behind, apical cells 

 greatly elongate, the apex of clavus scarcely farther from apex of scut- 

 ellum than from the apex of the wing. 



Color: Vertex and face obscure yellowish, ocelli and disc of eyes 

 black, margin of eyes, pronotum, scutellum and elytra olive-buff, some- 

 times with a metallic-brown reflection; tergum dark ; below light, ex- 

 cept ovipositor, which is invariably black. 



. cf slightly smaller than female. Color: Vertex and face yellow, 

 pronotum and scutellum yellowish-brown, elytra a deep smoky-brown 

 with a metallic reflection, abdomen black, legs smoky. 



Brachypterous form : ?, form as above nearly, except elytra, head 

 slightly more pointed, pronotum longer, overlapping the bases of the 

 elytra and scutellum, elytra short, truncate, twice wider than long, 

 abdomen rather long, all but the first two segments exposed; ultimate 

 dorsal segment longer than the preceding, nearly as long as the p)g- 

 ofers, which are exceeded by the ovipositor. Color entirely and uni- 

 formly lemon yellow except for the ocelli, eyes and ovipositor, which 

 are black. 



S , form of the preceding female, except for the much shorter ab- 

 domen, last dorsal segment not differing from others, pygofers above 

 very short, tipped with a brush of coarse hairs, color entirely and uni- 

 formly orange-yellow, except for the black eyes and ocelli. 



cf var. Color: Vertex and face yellow, pronotum and elytra deep 

 smoky-brown, abdomen brownish-black, legs and bristles on tip of 

 pygofers yellow. 



Genitalia: V, ultimate ventral segment over three times wider 

 than long, posterior angles a little rounding, posterior margin shallowly 

 emarginate with a short roundingly bilobed process usually wider than 

 long, pygofers stout, two and one- half times wider than long, slightly 

 exceeded by the black ovipositor. S' valve very small, posteriorly 

 rounding, plates small, triangular, their apices narrowly produced, 

 about twice longer than the valve, jiygofers short, armed with stout 

 bristles that equal the plates. 



Described from numerous examples of all the forms from Burling- 

 ton, Ames, Sioux City and Little Rock, Iowa, and from Yankton, S. D. 



Larva: Form very similar to the brachypterous female, head slightly 

 larger for the size of the body, body tapering regularly to apex of ab- 

 domen, wing-pads inconspicuous; color, light-yellowish, almost white 

 during the first moult. 



