168 Journal of the Mitchell Society [May 



STEXOCRANUS 



225. Secoiul anteiiiiiil setjnieiit four times ;is loiifj !is tlie first; female pygofers 



cylindrical 494 SteHDcruiius siinilis Crawford 



Second antennal segment not over three times as long as the first 495 226 



226. General color bright ochraceous orange, not ilarker in tlie lateral compart- 



ments of the frons .S. arundineus Metealf 



General color darker, sometimes distinctly darker in the lateral compart- 

 ments of the frons 227 



227. Frons light brown in the lateral compartments S. felti Van Duzee 



Frons black in the lateral compartments 228 



228. Genital styles broad ami contiguous at the base; anal process short, not 



reaching tlie ventral margin of the genital aperture 642 



S. t'ittatus Stal 



Genital styles slender, not contiguous at the base; anal processes long, 



reaching the ventral maigin of the genital aperture 643 S. dorsalis Fitch 



229. Median carina of tlie frons forkeil below the apex of' the vertex, head not 



much narrowed between the eyes 437 251 



Median carina of the frons forked on the apex of the vertex or obscure 

 419 230 



230. When viewed Laterally the apex of tlie head is acute with a faint transverse 



carina 426 Genus Megamelanus Ball 246 



When viewed laterally the ajiex of the lieail is rounded, without transverse 

 carina 422 231 



231. Frons widest above the middle, not or scarcely narrowed between the eyes; 



vertex scarcely produced in front of the eyes 421 



Genus Kelisia Fieber 24-1 



Frons widest below, narrowed between the eyes; vertex well produced in 



front of the eyes 416 232 



232. Head nearly as wide ;is the iirouotuni ; face ov.al in outline; slender species 



419 Genus Prokclisia Osborn 243 



Head narrower, tapering anteiiorly; face not oval, robust species 405 



Genus Mrriamchift Fieber 233 

 MK(;amelus 



233. Genital plates flat 645 234 



Genital plates robust, not fiat 655 241 



234. Anal processes wanting 646 235 



Anal proce.sses present 651 239 



235. Pygofer of the male strongly inflated 646 236 



Pygofer of the male not inflated 649 237 



236. Genital styles shorter than the genital plates, calcars very large, as long as 



the basal segment of the tarsus 645 Mepanielus paliFtus Van Duzee 



Genital styles longer than the genital plates, calcars small, not as long as 

 the basal segment of the tarsus 646 il. inflatus Metealf 



