278 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



era in 1897, and the most important subsequent papers have been 

 those of Hebard and of Rehn, in which three new species were 

 described and several sj^nonyms and generic transfers were indi- 

 cated. A very brief review of the Arizona species was made by 

 Ball and his associates in 1942. 



KEY TO THE GENERA OF THE CONALCAEA COMPLEX 



Tegmen longitudinally divided in color; posterior half (actually dorsal half, 

 since these tegmina are functionless and are never spread in life) with 

 pale veins on dark ground color, costal half entirely dark (pi. 10, fig. 3; 

 fig. 58, g) ; antennae brownish, male with dorsal valve of aedeagus en- 

 larged and decidedly produced posteriorly when seen in lateral view 

 (fig. 59) Conalcaea Scudder 



Tegmen of uniform color pattern, composed of blackish ground color with 

 superimposed pale veins (pi. 10, fig. 1; fig. 58, a); antennae orange (in 

 well-preserved specimens) ; dorsal valve of aedeagus with no pronounced 

 posterior development seen in lateral view (fig. 64) Barytettix Scudder 



The structural pattern of the aedeagus and the general appear- 

 ance of specimens indicate that two lines of development worthy 

 of generic recognition occur, though external separating charac- 

 ters of a structural nature are somewhat -vague. Tegminal color 

 separates nearly all specimens at a glance, but some individuals 

 of C. tniguelitaym do not show the bicolored condition clearly, 

 though belonging in that category. As shown in the photographs 

 (pis. 10, 11), the dark longitudinal bar on the lateral lobe of the 

 pronotum is characteristically interrupted on the prozona by a 

 diagonal pale mark in Barytettix, and the bar does not extend 

 onto the metazona. Available specimens of B. crassus were origi- 

 nally immersed in alcohol and do not show the pale mark, though 

 properly preserved specimens may do so. Conalcaea not only lacks 

 this pale mark, but the dark bar extends across the metazona. 

 Lateral pronotal carinae are indistinct in Conalcaea, absent in 

 Barytettix. In most species of Barytettix the texture of the sur- 

 face of the metazona is in noticeable contrast with that of the pro- 

 zona but scarcely contrasted in Conalcaea. The dominant body 

 color of Conalcaea is brown; in Barytettix there is a strong tend- 

 ency' toward green or greenish olivaceous. 



Genus CONALCAEA Scudder 



Conalcaea Scudder, Proc. Amer. Acad. Arts Sci., vol. 32, pp. 196, 204, 1897 

 (Jan.); Proc. U. S. Nat. Mus., vol. 20, pp. 9, 23-26, 1897 (Dec.).— 

 Bruner, Biologia Centrali-Americana, Orthoptera, vol. 1, pp. 218, 304- 

 305, 1907-1908. — Kirby, Synonymic catalogue of Orthoptera, vol. 3, p. 493, 

 1910.— Hebard, Proc. Acad. Nat. Sci. Philadelphia, vol. 69, pp. 263-264, 

 1917; Trans. Amer. Ent. Soc, vol. 61, p. 300, 1935.— Ball, Tinkham, 

 Flock, and Vorhies, Arizona Agr. Exp. Stat. Techn. Bull. 93, pp. 323, 



I 329-330, 1942. 



