194 



Usinger: Hemiptera 



Fig. 7:8. Hesperocor/xa vulgaris (Hungerford), Lake Britton, 

 Shasta County, California, September 17, 1946 (H. P. Chandler). 



larger, length 8 mm. or 

 2 



distal angle of corium; size 

 more 



Infraocular width of genae at level of hypoocular suture 

 as great as diameter of middle femur; anterior femur of 

 male conspicuously produced at inner base (fig. 7:9«j); 

 Nevada, Arizona, Texas, Mexico, southern California 



desert abdominalis (Say) 1832 



Infraocular width of genae at level of hypoocular suture 

 narrower than diameter of middle femur; anterior femur 

 of male not conspicuously produced at inner base ... 3 

 Prothoracic lateral lobe about equal in width to width 

 of middle femur, its rear margin not conspicuously 

 shorter than distal margin; anal lobes of female shal- 

 lowly notched on inner ventral margin (fig. 7:9m); 



southern California uhleri (Hungerford) 1925 



Prothoracic lateral lobe plainly broader than width of 

 middle femur, its rear margin conspicuously shorter than 

 distal margin; anal lobes of female deeply notched on 



inner ventral margin 4 



Lower basal angle of front femur roundly but not greatly 

 produced; male right genital clasper broadest at basal 

 third and pointed at tip (fig. 7:9u>); southern and central 



California uhleroidea (Hungerford) 1938 



Lower basal angle of front femur not produced; male 

 right genital clasper broadest at distal third and rounded 

 at tip (figs. 7:6; 7:9£); widely distributed in fresh water 



streams, California and Oregon 



calif ornica (Hungerford) 1925 



Key to California Species and Subspecies of Triehoeorixa 



1. Width of interocular space at narrowest point distinctly 

 exceeding width of an eye along hind margin as seen 



from above; nodal furrow located at apex of pruinose 

 area of embolar groove in females (fig. 7:7); widely 

 distributed, Neotropical region, central and southern 

 California in brackish and saline waters (fig. 7:96). . 

 reticulata (Guerin) 1857 



— Width of interocular space subequal to or less than 

 width of an eye along hind margin; nodal furrow divid- 

 ing pruinose area of embolar groove subapically in 

 females 2 



2. Male strigil long, slender and curved, appearing as a 

 heavy dark line along margin of left lateral lobe of 

 sixth abdominal tergite, at point of greatest width less 

 than one-sixth as wide as long; females with costal 

 margins broadly, shallowly indented in front of middle; 

 eastern and southern United States, Imperial County, 

 California (fig. 7:9d) calva (Say) 1832 



— Male strigil not appearing as a heavy dark line; at 

 point of greatest width at least one-sixth as wide as 

 long; females with costal margins abruptly dilated at 

 or behind middle 3 



3. Male strigil arcuate; female costal margins abruptly 

 dilated at about middle; Colorado River near Needles, 

 California (fig. 7:9c) uhleri Sailer 1948 



— Male strigil elongate-oval, straight; female costal 

 margins abruptly dilated beyond middle; North America 

 and West Indies, brackish and saline waters (verticalis 



Fieber ) 185 1 (fig. 7:9a) 4 



4. Length of head as seen from above greater than length 

 of tarsus of middle leg in males; prenodal polished area 

 of costal margin not exceeding length of tarsus of 

 middle leg in female; saline waters, Salton Sea, Death 

 Valley subspecies saltoni Sailer 1948 



— Length of head as seen from above less than length of 

 tarsus of middle leg in males; prenodal polished area 

 of costal margin definitely exceeding length of tarsus 

 of middle leg in females; coastal brackish waters 



subspecies calif ornica Sailer 1948 



Key to California Species of Corisella 



1. Male pala with only 1 or 2 conspicuous pegs in upper 

 row position (fig. 7:9/); both segments of hind tarsus 

 brown; generally distributed, United States and Mexico 

 (-tumida Uhler) tarsalis (Fieber) 1851 



- Male pala with a row of 8 or more pegs near upper 

 margin; first segment of hind tarsus, at least, yellow, 

 not brown 2 



2. Pronotum with a median longitudinal carina on anterior 

 fourth, disc crossed by 6-8 dark bands, none of which 

 is partly or completely interrupted (figs. 7:56; 7:9<7); 

 size small, 4-5.8 mm.; widely distributed in western 

 United States alkali waters (=dispersa Uhl.) 



decolor Uhler 1871 



- Pronotum without a median longitudinal carina, crossed 

 by 10 or more partly interrupted bands; size larger, 

 over 6.3 mm 3 



3. Male vertex only briefly, roundly produced; male pala 

 broader than tibia, its dorsal margin projecting above 

 tibia (fig. 7:9e); rear margin of last ventral abdominal 

 segment of female broadly, medianly produced; western 

 United States and Mexico, southern and central Cali- 

 fornia inscripta (Uhler) 1894 



- Male vertex strongly, broadly produced; male pala not 

 broader than tibia, or at least the dorsal part not 

 projecting above tibia (fig. 7:9A); rear margin of last 

 ventral abdominal segment of female nearly straight; 

 Mexico, southern and western United States, Oregon, 

 Nevada, Arizona edulis (Champion) 1901 



Key to California Species of Hesperocorixa 



1. Pronotum nonrastrate, shining; clavus and corium some- 

 what rastrate to rugulose (fig. 7:9a); widely distributed, 

 North America laevigata (Uhler) 1893 



