232 



Arphia sulphured, Fabr. H.l, 4, 6; Je. 6, 7, 9, 23. (10) Open 

 woods, all 111., early summer. 



Arphia xanthoptera Germ. H.l, 4, Mer. ; Au. 20, 22, 30. (5) 

 Roadsides, in black-jack. Dry woods, all 111. 



Encoptolophus sordidus Burm. Mol., S. 8. 111., especially north- 

 ward, on dry open ground. 



Hippiscus tuberculatus Palis. H.4, Je. 6. 0. 111. and northward; 

 infrequent. 



Hippiscus phomicopterus Germ. H.l, 4; Je 5, 6, 7, 23. (43) 

 Common on grassy dunes and along roadsides in black-jack 

 in early summer, with the next species. S. 111., in dry open 

 woods on hillsides. 



Hippiscus haldemanii Scudd. H.l, 2, 4; Je. 6, 7, 8, 23. (21) Com- 

 mon in the sand region, associated with the preceding species. 

 On Rock Island (McNeill, tuherculatus, fide Scudder). The 

 intercalary vein in Hippiscus, especially in this species and 

 phwnicopterus, is quite prominent and bears a row of minute 

 tubercles, as in Mecostethus ; and the upper carina of the in- 

 ternal face of the hind femur is rubbed against it, causing a 

 distinct rasping stridulation. The sound may be easily pro- 

 duced in this way in freshly killed individuals. In all the 

 (Edipodince of this list the same structure of the intercalary 

 vein occurs, and presumably also the same habit of stridula- 

 tion by means of it when not flying. Regan ('03) has de- 

 scribed and figured (PL I., Fig. 3) this method of stridulation 

 in Psophus. Morse ('96) has noted the general occurrence of 

 this structure in the (Edipodinm, and has seen and heard the 

 stridulation in Circotetti.n verruculatus and Encoptolophus sor- 

 didus. 



Hippiscus suturalis Scudd. Mol. (McNeill, rugosus). 



Hippiscus rugosus Scudd. H.l, 2, 3, Teheran, H.m. ; Au. 13, 17, 

 18,22. Nymph, Au. 18. (16) Lower slopes of dunes. All 

 111. 



Hissosteira Carolina Linn. H.2, 4; Au. 12, 18. Nymph, Au. 20. 

 (3) Roadsides. All 111., bare ground of roads, etc. 



Spharagemon bolli Scudd. H.l, 2, 3, 4, Mer. ; Au. 13, 17, 20, 22, 30. 

 (7) In older dry forest, occasional in black-jack. All 111. 



Spharagemon wyomingianunt, Thorn. H.l, 2, 3, 4, 5, Mol., Mer. ; 

 Je. 23, Au. 12, 13, 14, 17, 18, 19, 20, 29, 30, S. 2, 8. Nymph, 



