MORGAN HEBARD 201 



BB. Cleneral color reddish brown. (Cephalic margin of pronotura usually 

 rather narrowly paler.) 

 C. Limbs more elongate and sk^nder. 



D. Pronotum with a small, weakly defined, triangular, yellowish suf- 

 fusion on each side cephalad. Interooular space slightly narrower 

 than that between the ocelli. Extreme southern Arizona, Coa- 



huila 3. grata new species 



DD. Pronotum narrowly pale cephalad. Interocular space slightly 

 broader than that between the ocelli. 



E. Lower California 2. rehni Hebard 



EE. Southwestern States east to Pecos River in Texas; Sonora. 



n. erratica Rehn 

 EEE. Central Texas, east of Pecos River. . . 6. tonkawa new species 

 CC. Limbs shorter and stouter. (Segments of abdomen normally 

 immaculate.) Arizona, southern California, Chihuahua, Sonora. 



7. apacha (Saussure) 



Though we are now satisfied with the status of at least all of 

 the species found in the United States, we can state definitely 

 that the present genus is easily the most difficult of the genera of 

 Blattidae found in this country. 



Arenivaga bolliana (Saussure) (Plate VII, figures 1 and 13) 

 lS9o. [Iloinocoi/dinin] hnUinria Saussure, Rev. Suisse Zool., i, fasc. 2, p. 298. 



[d", Texas.] 

 1904. Homoengainia bollinna variety nigricans Caudell, Mus. Brooklyn 



Inst. Arts and Sci., Bull, i, p. 107. [o"; Esperanza .Ranch, Brownsville, 



Texas.] 



1917. Arenivaga bolliana Hebard, Mem. Am. Ent. Soc, 2, p. 223, pi. ix, 

 figs.. 3 to 5. [d", 9 ; Dallas, Waco, Bosque County, Shovel Mountain in 

 Burnet County, San Marcos, Victoria, Corpus Christi, Brownsville, Esper- 

 anza Ranch near Brownsville, Mission, Ringgold Barracks near Rio Grande, 

 Kerrville, Sabinal, Knippa, Uvalde, Neuces River in Zavalla County, 

 Carrizo Springs, Eagle Pass, Devils River, High Bridge of Pecos River, 

 Texas.] 



1918. Arenivaga bolliana variety )iigrican>i Caudell, Proc. Ent. Soc. Wash- 

 ington, XX, p. 157. (Evidence indicating specific value suggested.) 



We have little to add to our remarks on the species given in 

 1917. We believe that nigricans should be imi-eservedly assigned 

 to synonymy. The Brownsville material before us is decidedly 

 smaller than any other specimens of bolliana we have seen and 

 individuals in the series are of the maximum intensive coloration, 

 which we have not found in other material of the genus, though 

 every gradation to the normal type occurs. Careful comparison 

 .with typical material of the species shows no feature woi-thy of 

 nominal recognition of an}' kind. 



TRANS. AM. ENT. SOC, XLVI. 



