202 NORTH AMERICAN BLATTIDAE 



the tegmina and wings, in the moderately large size (for the 

 genus) and rather broad form. The confusion in the literature is 

 in large part due to the fanciful death's-head marking, figured and 

 described for atropos, and in that species situated on the mesono- 

 tum and metanotum. In the present species the dark pronotal 

 spot bears pale markings, which afford an even more striking 

 fanciful resemblance to the human eyes, nose and mouth, and fail- 

 ure to recognize the proper position of this marking in the two spe- 

 cies has resulted in constant confusion. 



The most striking features of difference between the species are 

 as follows. In craniifer the male averages distinctly smaller than 

 the female; with pronotum decidedly smaller, the length being 

 contained in the width nearly 1.4 times in the male and 1.49 times 

 in the female. The interocular space in the male is slightly less 

 than, to slightly more than, half the interocellar width ; in the female 

 slightly more than half, to slightly less than, the full interocellar 

 width. The dark pronotal spot contains four pale markings sug- 

 gesting the human eyes, nose and mouth, these very rarely in part 

 obliterated. The tegmina are dark blackish brown with a prout's 

 brown tinge, and have the proximal portions of the marginal and 

 anal fields strikingly buffy, the extent of these markings variable 

 and their distal margins extremely irregular but sharply defined; 

 frequently, and particularly in the males, a large transverse suf- 

 fusion of buffy is, to varying degrees, weakly indicated mesad on 

 the tegmina. 



while sinistrad these are further developed into relatively much larger chitinous processes, 

 rounded distad, with surfaces shagreenous, the largest being situated proximad, which 

 projection is apically irregularly bilobate. 



Measurements {in millimeters) 



Length Length Width Length Width 



Cf of of of of of 



body pronotum pronotum tegmen tegmen 



Caparo, Trinidad. (8) 42.7-49.1 I3-3-I5-3 19 3-21-6 50.8-56.4 19.2-20 



? 

 Caparo, Trinidad. (14) 57-5«« 14-6-15.9 20,8-22.9 53-57-« 22-23 



Specimens Examined: 27; 10 males and 17 females. 



Diego Martin, Trinidad, VI, 20, 1915, (R. A. Wood; river estate), i 9 , [Hebard Cln.]. 

 Caparo, Trinidad, VI, 1913, (^. M. Klages), 2c^, 3 9 , [A. N. S. P.]; VIII, 1913, (S. M. 

 Klages), 8cf , 13 9 , [Hebard Cln.]. 



