AMERICAN ORTHOPTERA. 289 



It does not seem possible to differentiate B. fusca Brunner* in 

 view of the great variability of this form. In a series of six speci- 

 mens intergrades are present between the form with the posterior 

 margin of the pronotum truncate and that with the same portion 

 rotundate. 



Blaberus rubensis Saussure. 



1864, B[ldberd] Cubensis Saussure, Revue et Magasin cle Zoologie, 2e ser., xvi, 

 p. 347. [Cuba.] 



Two males: Jundiahy, Sao Paulo, Brazil. Jan. 30 and Feb. 17, 

 1899. (Schrottky.) [A. N. S. Phila.] 



Blaberus thoracicus Saussure and Zehntner. 



1894. Blabera thoracica Saussure and Zehntner, Biol. Cent.-Amer., Orth., i, 

 p. 120, tab. v, fig. 25. [Panama; Bogota, Columbia.] 



One female ; Nicaragua. [U. S. N. M.] 



This specimen is larger than Saussure and Zehntner's measure 

 ments, and has the posterior margin of the pronotum more arcuate 

 than in their figure. The exact relationship with B. posticus 

 Erichson f is hard to ascertain, as the latter was very imperfectly 

 described. 



Genus BYRSOTRIA Stal. 



1874, Byrsotria Stal, Bihang till K. Svenska Vet. Akad. Handlingar, Band 2, 

 no. 13, p. 18. Type. — Blabera thunbergii Guerin = Blatta {Blabera) 

 fumigata Guerin. 



Byrsotria fumigata (Guerin). 



1857, Blatta (Blabera) fumigata Guerin, in La Sagra's Hist. Phys. Polit. et 



Natur. de Pile de Cuba, Anim. Artie, p. 335, tab. 12, fig. 4. [Environs 



of Havana. Cuba.] 

 Blatta (Monachodal thunbergii Guerin, in La Sagra's Hist Phys. Polit. et 



Natur. de 1'Ile de Cuba, Anim. Artie., p. 337, tab. 12. fig. 6. [Cuba.] 



Eleven specimens; one male, two females, eight immature indi- 

 viduals ; Guanajay, Pinar del Rio, Cuba. May 5. (Palmer and 

 Riley.) [U. S.*N. M.] 



An examination of this material convinces one that thunbergii is 

 simply a form of fumigata, as Saussure and Zehntner f have already 

 intimated. The male individual agrees perfectly with Guerin's 

 figure of fumigata (known only from the male), except that the 



* Nouv. Syst. Blatt., p. 376. 



t Schomburgk, Reisen in Britisch Guiana, iii, p. 580, 1848. 



X Biol. Cent.-Amer., Orth., i, p. 121, 1893. 



TRANS. AM. ENT. SOC, XXIX. (37) SEPTEMBER. 1903. 



