232 



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

 woods, all 111., early summer. 



Arphia xnnthopter a 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 tuherculatus Palis. H.4, Je. 6. C 111. and northward; 

 infrequent. 



Hippiscus phanicopterits (lerm. 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 haldemaiiii 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 

 jthmiiicopterus, is quite prominent and bears a row of minute 

 tubercles, as in Mecostcf/nis; 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 

 (Edipoditue 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 (PI. I., Fig. 3) this method of stridulation 

 in Psophus. Morse ('9(5) has noted the general occurrence of 

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

 stridulation in ('ircotett/.r verrueulatus and Encoptolophus sor- 

 didus. 



Hippiscus suturolis Scudd. Mol. (McNeill, ru</osus). 



Hippiscus ruffosus 8cudd. H.l, 2, 3, Teheran, H.m. ; Au. 13, 17, 

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

 111. 



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

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



Spharagemon hoUi 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 tvyomingianu/u 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, 



