170 Journal of the Mitchell Society [May 



250. Color pale green, with a pair of dark red stripes from the apex of the vertex 



to the apex of the abdomen M. ntfivittatus Ball 



Color pale oehraceous yellow, eyes black If. spartini Osborn 



251. Median carina of the frons forked near the middle, the two prongs of the 



fork widely separated; maeropterous forms chiefly 111, 437 



Pcregrinus maidis Ashmead 

 Median carina of the frons forked above the middle, the two prongs but 

 slightly separated; brachypterous forms chiefly 221 



Genus Pissoiiotus Van Duzee 252 

 PISSONOTUS 



252. Clypeus black 253 



Clypeus yellow 263 



253. Pale buffy in color, with distinct pustules on the seventh abdominal seg- 



ment 115 Pissonotiis quadripustulatus Van Duzee 



Color darker, Avithout pustules 116 254 



254. With the apex of the brachypterous wings marked with paler, veins con- 



colorous 117 256 



With the apex of the brachypterous wings concolorous, veins pale 116 255 



255. Apex of the frons broadly white, frons marked with white bars 



P. (ipliidioides Van Duzee 

 Apex of the frons not marked with wliite, white bars wanting 



P. hntnneu.t Van Duzee 



256. Abdomen black, with a broad median vitta brown 117 



P. dnrsalin Van Duzee 

 Abdomen without broad vitta 257 



257. Color almost uniform black, wings sometimes a little paler 258 



Color oehraceous tawny 261 



258. Apical markings of the wings in the form of a distinct band 259 



Apical markings of the wings in the form of spots or wanting 



P. ater Van Duzee 



259. Anterior and intermediate tibiae black or nearly so 



P. marpinatus Van Duzee 

 Anterior and intermediate tibiae not black 260 



260. Anal processes long, nearly reaching the ventral margin; genital plates 



tubular, surrounding the genital styles basally 673 



P. jxiflipcs Van Duzee 



Anal processes short, the dorsal angles of tlio jiygofers strongly produced 



&74 P. crawfordi Metcalf 



261. Head concolorous or i)alcr than the pronotum and elytra 262 



Head and pronotum black or nearly so, sharply contrasted with the paler 



mesonotum, wings and abdomen P. guttatus Spooner 



