172 NORTH AMERICAN BLATTIDAE 



longer spines, in strongly increasing length ratio, few spines on ventro-caudal mar- 

 gin; median and caudal femora furnished with a single, long, genicular spine and 

 with ventral margins supplied with heavy, elongate spines. Arolia present. 



Characters of Female. — (Nogales, Arizona.) Agrees with male except in following 

 features. Size large, form stouter. Head and pronotum in consequence propor- 

 tionately broader. Supra-anal plate strongly tectate, with a medio-longitudinal 

 ridge; lateral margins straight, convergent to deep median angulate-emargination, 

 with straight sides, distal apices of plate acute. Subgenital plate as typical for the 

 Blattinae. 



Measurements in {millimeters) 



f Width of Length of 



tegmen eaudal tibia 



3-3 8.7 



3-4 9-2 



Other exotic females before us are 20 to 27 mm. in length. 



The complex color pattern is shown by the figure here given. 

 The dark brownish black color is tinged with claret brown on the 

 tegmina, mesal portion of dorsal surface of abdomen and on the 

 limbs. The extensive dark mesal portion of the ventral surface 

 of the abdomen is a rich claret brown. 



This insect is generally distributed throughout the warmer 

 regions of the earth; it is probably domiciliary, with habits very 

 similar to those of Periplaneta americana. 



In the United States the species has apparently gained a foot- 

 hold only at Nogales, Arizona, on the Mexican boundary. It has 

 probably been long established in western Mexico and has been 

 recorded from there by Saussure, from Acapulco by Brunner, 

 while a good series from tropical western North America is now 

 before us.-^*^ 



Specimens Examined: i; i female. 



Nogales, Arizona, VI, 14, 1903, (E. J. Oslar), i 9, [U. S. N. M.j. 



"8 Sierra el Tosti, Lower California, Mexico, X, 1893, 2 9 , [Hebard Cln.]. 

 San Jose del Cabo, I.. Cal., Mex., 8 9, l juv. a", i juv. 9, [Mebard Cln. and A. M. 

 N. H.]. 



Escuinapa, Sinaloa, Mex., (J. H. Batty), i small juv. d", [A. M. N. H.]. 



