170 PROCEEDINGS OF THE NATIONAL MUvSEUM vou 85 



Fieber, in having a shorter rostrum, the lateral margins of the genae 

 not notched below the eyes, a shorter, broader face, and the crown 

 usually without a distinct median carina. 



Crown as long as, or usually longer than, the pronotum; margin 

 between crown and face either rounded or carinate. Pronotum 

 short, posterior one-half usually faintly, transversely striate; lateral 

 margins carinate; posterior margin shallowly incised. Males bra- 

 chypterous, subbrachypterous, or macropterous; fore wings mem- 

 branous or sometimes subcoriaceous ; venation irregular, with outer 

 anteapical cell usually absent or small and central anteapical cell 

 usually open basally; appendix absent. Females brachypterous so 

 far as known; fore wings usually subcoi'iaceous. Pccten of hind 

 basitarsus usually composed of four to six setae in an uneven row. 

 Sexual dimorphism apparent. 



Ovipositor sheath extending beyond tip of pygofer. Male pygofer 

 appressed. Male valve small; plates long and slender; styles long, 

 slender, and curved upward distally; pygofer with a pair of hook- 

 like processes next anal tube; sternal apodemes absent. 



Type of the genus, Errhomenus Imeatv.H Baker, 1S98. The species 

 assigned to the genus may be divided into two subgenera, as indi- 

 cated by the following key: 



KEY TO THE SPECIES OF ERRHOMUS 



1. Anterior marj;in of crown not distinctly cnriniitc. Clypons dis- 



tinctly swollen; snture between clypeus nnd lateral facial 



.sclerites deeply impressed. (Snbseniis ErrhoDiux) 2 



Anterior margin of crown distinctly carinate. Clypeus not dis- 

 tinctly swollen; suture between clypeus and lateral facial 

 sclerites not deeply impressed. (Subgenus f'(irsoniis) 4 



2. Eyes somewbat bulbous. Very robust species ; males sub- 



brachypterous oregonensis (Baker) 



Eyes not bulbou.s. Not unusually robust .species: males 

 macropterous so far as known 3 



3. Posterior margin of seventh sternite of female ])i'oduced and with 



a small median notch. Lateral processes of aedeagus rather 



stout and serrate on outer margins montanus (Raker) 



Posterior margin of seventh sternite of female broadly and rather 

 shallowly incised. Lateral processes at tiji of aedeagus slender 

 and not serrate lineatus (Raker) 



4. Anterior margin of head neither thin nor subfoliaceous ; disk of 



crown convex irroratus (Ball) 



Anterior margin of head thin and subfoliaceous; disk of crown 

 flat or concave 5 



5. Crown of female only slightly produced medially, anterior margin 



rounded. Pygofer process of male as illustrated in plate 6, 



figure 9 niaculatus (Gillette and Baker) 



Crown of female distinctly produced and subangular. Pygofer 



process of male not as ab(»ve aridus (Ball) 



