1921] NATURAL SCIENCES OF PHILADELPHIA. 213 



and greater portion of surface granulate, not everywhere impresso- 

 punctate. The present material agrees fully with Saussure's ade- 

 quate description of his synonymous Zetohora {Phortioeca) castanea. 

 It is of interest to note that the measurements given by Burmeis- 

 ter of the body length of this and the two preceding species are in 

 all cases considerably less than that of specimens subsequently, 

 and apparently correctly, recorded as these species. 



Length of body cf 20.7-23, 9 25; length of pronotum c? 6.2-6.8, 

 9 7.3; width of pronotum cf 9.7-10.3, 9 11.7; length of tegmen 

 d" 20.2-21, 9 23; width of tegmen d" 7.8-8 7, 9 9.7 mm. 



BLABERINAE. 



Blabenis giganteus (Linnaeus) 



1758. B[laUa] gignntea Linnaeus, Syst. Nat., Ed. X, I, p. 424. [America.] 

 1802. Blatta colossea lUiger, Mag. Insektenkunde, I, p. 186. [Demerara, 

 [ = British Guiana]. ] 



La Forestiere, upper Maroni River, French Guiana, 1 large juv. cf . 



St. Jean du Maroni, French Guiana, 2 cf , 1 9 . 



The above synonymy has been recently established by us.^^ In 

 the present specimens the width of the marginal field of the tegmina 

 is: cf 7.2, .9 7.9 mm. 



Eublaberus biolleyi (Rehn) Plate XIV, figure 3, 4, 5. 6 and 7. 



1906. Blaberus biolleyi Rehn, Proc. Acad. Nat. Sci. Phila., 1905, p. 792, 

 fig. 1. [ 9 ; Reventazon River, plains of Santa Clara, Costa Rica. ] 



St. Jean du Maroni, French Guiana, 1 cf , 1 9 , 1 juv. 



These specimens, like a female from Trinidad, in the Hebard Col- 

 lection, differ from the type in having the pronotal markings fused 

 to different degrees. Such is the individual variability in these 

 markings that we feel confident that but one species is represented. -^ 

 This species is clearly distinct from E. posticus (Erichson), but the 

 other described species-^ can not be vouched for, until extensive 

 series can be secured. The difficulty is that, at present, there is no 

 means of telling whether the various conditions described, with 

 pronotum more heavily marked and suffused, represent distinct 

 species or, in some cases, merely manifestations of decided intensive 

 coloration in individuals of the same species. 



22 Trans. Am. Ent. Soc, XLVII, p. 148, (1921). 



23 We figure the pronotum of the specimens before us, to show the individual 

 variabiUty of these markings. 



-^ In chronological order the species are; 1848 posticus (Erichson), 1857 sulzeri 

 (Guerin), 1869 femaraia (Scudder), 1894 thoracica (Saussure and Zehntner) ( = 

 posticus), 1894 immacula (Saussure and Zehntner), 1903 distanti (Kirby), 1906 

 biolleyi (Rehn). 



