416 Materials for a 3Ionograph 



united together rounded, very slightly shorter than in 

 the $ . Length of whole body, .2 in. ; forceps, .04 in. 

 Mass. (H. Coll., November 4, 1845, flying in evening; 

 Shurtleff, Aug. 28.) Virginia, (Uhler.) imperfect speci- 

 men ; 3 (J , 1 $ . 



BLATTARIiE, Latreille. 



Stylopi/g-n, Fischer, having been proposed as a genus 

 for the reception of Blatta orientalis L., before Peripla- 

 neta of Burmeister, must be retained for it ; but since B. 

 americana L. must be placed in a different genus from 

 B. orientalis^ we may reserve Periplaneta for that species 

 with its allies, and the more properly since it is mentioned 

 first under the genus by Burmeister. The two genera will 

 be found to differ not only in the rudimentary condition 

 of the wings in the females of Sti/lopi/g'a, but also in the 

 wings of the males, which are much shorter than the body 

 in Stylopj/g-a, and longer than the body in Periplaneta ; the 

 outer border also of the anterior pair is much less rounded 

 in the former than in the latter, while another character is 

 found in the deep fissuration of the supraiinal plate in Per- 

 iplaneta, which is almost wholly wanting in Sti/lopyga, 

 where it is squarely docked, instead of being pointed, as 

 in Periplaneta. 



STYLOPYGA, FISCHER DE W. 



* 1. S. ORIENTALIS, Fisch. d. W., Bull. d. Nat. de Mos- 

 cou; VI. 3(j6. (1833.) For synonymy, see Fischer, Orth. 

 Eur. 



Seaboard of Mass., (H. Coll., Shurtleff, Sanborn, S. H. 

 S.) N. York, (S. H. S.) Maryland, (Uhler.) The pro- 

 portions of the length of the elytra to their breadth in 

 this species and in Periplaneta Americana are very variable. 



PERIPLANETA, BURMEISTER. 



* 1. P. AMERICANA, Bunucistcr, Ilandb. d. Ent. ; II. 503. 

 (1838.) For synonymy, see Fischer, Orth. Eur. ; to which 



