1 84 NORTH AMERICAN BLATTIDAE 



americana, the head is seen to be decidedly shorter,^^^ the pronotum in proportion 

 not as long.29^ the supra-anal plate smaller, with meso-distal emargination less de- 

 cided and cerci less elongate and less attenuate distad. 



Measurements {in millimeters) 



Length Length Width Length Width Length Length 



-^ of of pro- of pro- of of of of eau- 



^ body notum notum tegmen tegmen cercus dal tibia 



Thomasville, Georgia 28.5 7.9 10.8 29.9 9.9 4-9 ii-9 



Everglade, Florida 26.5 6.7 9 24.3 8.5 4.9 9.7 



Everglade, Florida 27 7.2 9.7 27.3 8.9 5 li 



Jewfish, Florida 25.1 7.1 10.3 27 9.2 4.7 10.2 



Katherine, Texas 25.2 7 9.6 26.8 9.1 4.3 9-4 



9 



Billy's Island, Georgia. .. . 28.5 7.9 10.8 23.8 9.3 51 iO-9 



Fort Myers, Florida 33 8.9 11. 7 26.5 10 5-8 12.3 



Everglade, Florida 29.7 8.3 10.6 24.9 9.5 5-4 ii-2 



Large exotic series before us show that individual size differences 

 of moderate degree are frequent. In series of females from the 

 same locality, decided differences are also found in pronotal ampli- 

 tude. The differences in average tegminal length between the 

 sexes is much less in bninnea than in americana. 



Coloration. — In general coloration this insect agrees very nearly 

 with americana, differing chiefly in the following features. Head 

 with entire occiput dark chestnut brown, this extending to ventral 

 margin of interocellar area. Pronotum with dark blotches usually 

 not as decided, but with caudal margin more heavily suffused with 

 blackish brown, this continued as a narrow peripheral margin 

 about the pronotum. Outlines of these darker markings as vague 

 as in americana. Intensification and recession of this color pattern 

 is quite as decided as in americana and, in consequence, the normal 

 color differences between the two species are sometimes obliterated. 



This domiciliary insect is apparently more nearly peculiar to 

 the tropics and adjacent regions than americana. It is circum- 

 tropical in distribution and from the exotic material at hand would 

 appear to be the most abundant species of the genus, at least in 

 tropical America. The records given below define the known dis- 

 tribution of the species in the United States. An additional record 



293 The length of the head, however, tliougli normalK- nuuli greater in americana, is 

 found to vary to a surprising degree in that species. 



-" Enough individual variation, however, occurs in the pronotal size and form to 

 make this character true only for the majority, not all, of the specimens compared. 



