of the North American Orthoptera. 417 



add 9 Blatta domingensis, Pal. de Beauv., Ins. ; 182, PI. 1 

 b., fig. 4. (1805.) 



Seaboard of Mass., (H. Coll.) Indiana, (Mus. Comp. 

 ZooL) Mexico, (Uhler.) Texas, (Mus. Comp. Zool., Uhler.) 



PLATAMODES, Nov. gen. 7r 



A genus more closely allied to Periplaneta than to any 

 other, but readily distinguishable from it by its much nar- 

 rower and more elongated body, the sides being sub-par- 

 allel to one another throughout their whole extent, while 

 in Periplaneta the abdomen is much swollen. The wings 

 and wing-covers extend beyond the abdomen, the latter 

 being well rounded at the tip. The supraanal plate is reg- 

 ularly rounded, but lacks altogether the fissuration seen in 

 Periplaneta ; but at the same time it is not squarely docked 

 as in Stylopyga. The anal cerci are somewhat shorter, 

 and not so flattened as in Periplaneta^ while the anal 

 styles are very short and turned abruptly downwards. In 

 Periplaneta the sub-genital plate does not extend so far 

 backward as the supraanal. In Platamodes it extends 

 backward farther. A further distinction between the two 

 genera may be seen at the inner borders of the eyes, 

 which in Platamodes are nearly parallel; while in Peri- 

 planeta they approach one another anteriorly. I have only 

 seen males. 



1. P. PENNSYLVANIA. 



Blatta Pennsylvania^ De Geer, Mem. ; III. 537. PI. 44, 



fig. 4. (1773.) 



" Oliv., Enc. Meth. ; II. 317. (1791.) 



Indiana, (Mus. Comp. Zool.) Maryland, (Uhler.) 5 J. 



* 2. P. UNICOLOR, nov. sp. 



Blatta pennsylvanica, H. Cat. ; 56, (non De Geer.) 



Blatta rufescens and bicolor? H. Cat.; (non Pal. de 

 Beauv.) 



Wings and wing-covers uniform pale shining reddish 

 brown ; head and prothoracic shield nearly the same, but 



JOURNAL B. S. N. H. 53 NOVEMBER, 1862. 



