114 THE BLATTIDAE OF PANAMA 



This insect was described as smaller than A. marmorata (Stoll). 

 From careful consideration of the literature, the type, and a series 

 of twenty-one Central American examples of the genus at hand, we 

 have reached the following conclusions. 



Stoll's marmorata^^^ is an insect averaging distinctly smaller in 

 size than tessellata, but having the intcrocular space decidedly 

 wider. It is represented by material before us from Nicaragua 

 only, and tessellata may prove to be a large southern race of 

 that species. The material recorded by Rehn as marmorata from 

 Colombia, represents instead tessellata, which we believe is also the 

 case for all other material previously recorded from Costa Rica 

 southward. Rehn was unacquainted with true marmorata at the 

 time of the description of tessellata. 



To show the exact differences from which we feel justified in 

 holding tessellata as a valid species, we give the following measure- 

 ments (in millimeters). 



Width of 



interocular Length of Width of Length of Width of 

 O space pronotum pronotum tegmen tegmen 



viarr)wrata 



San Marcos, Nicaragua 1.7 14 21.8 50 22.3 



tessellata 



Tarbaca, Costa Rica i.i 15.3 23.4 59.5 24.4 



San Carlos, Costa Rica i 16. i 26.2 62.8 26.8 



Gorgona, Panama i 16.6 25.2 68.3 27.9 



Colon, Panama 1.2 17.2 28 70 29.9 



9 



marmorata 



Nicaragua 2 14. i 22.1 42 21.7 



Nicaragua 2 13.9 22.3 41.8 21.3 



tessellata 



Monte Redondo, Costa Rica . . 1.2 17 26.8 54.8 25.8 



Costa Rica 1.3 17.9 27.7 57.9 27 



Colombia 1.3 18.2 28.3 62 30 . 6 



The present species shows decided size variation and also fre- 

 quent pronotal asymmetry. 



"■■' Bruner has recorded that species from the island of Oiiietepe, Nicaragua, and has 

 given an excellent figure of the insect (Nat. Hist. Bull., Lab. Nat. Hist. State Univ. Iowa, 

 iii, p. 60, pi. ii, fig. i, (1895)). 



