Mr. "R. Shelford's Studies of the Blattidfe. 253 



Thyrsocera tolteca, de Saussure, Rev. Zool. (2) xiv, p. 168 

 (1862) ; Mem. Mex. Blatt. p. 124, pi. i, f. 21 (1864) ; 

 Brunner, 1. c. p. 125, n. 18 (1865). 



I agree with Kirby in regarding this as quite distinct 

 from P. ohlongata, L. ; de Saussure and Zehntner on the 

 other hand sink it as a synonym of P. ohlongata, L. Good 

 figures of the fepecies have been published, so that it can 

 be readily recognized. 



3. P. inclusa, Wlk. (Brazil, Pernambuco.) 



Pscndomops inclusa. Walker, Cat. Blatt. B. M. p. 212 



(1868). 

 Thyrsocera amcena, de Saussure, Mel. Orthop. fasc. iv, p. 



97 (1872). 



The species can easily be distinguished by the horseshoe- 

 shaped dark mark on the pronotum. In some specimens 

 this may be considerably reduced, but it is never entirely 

 absent ; the dark shadings on the tegmina are subject to 

 considerable variation. The type of inclusa is in the 

 Oxford Museum. 



4. P. laticornis, Perty. (Brazil.) 



Blatta laticornis, Perty, Del. Anim. Art, p. 117, pi. 23, 



£ 4 (1834); Serville, I. c. p. 116 (1839). 

 Thyrsocera laticornis, Burmeister, 1. c. p. 499, n. 6 (1838) ; 



Brunner, I.e. p. 123, n. 11 (1865) ; de Saussure, Miss. 



Mex. Orth. p. 51 (1870). 

 Thyrsocera dvMa, de Saussure, Rev. Zool. (2), xiv, p. 168 



(1862) ; Mem. Mex. Blatt. p. 123 (1864) ; Brunner, 



1. c. p. 124, n. 12 (1865). 

 Pseiulomops concinna, Walker, 1. c. p. 82, n. 20 (1868). 



Perty's excellent figure is a valuable aid to the identifi- 

 cation of this species ; from the Halle Museum I received 

 two examples which I was able to identify without much 

 doubt. The following is a short description of them : 



^ . Head red, shading to darker on the labrum, antennse black 

 with a testaceous anuidus occupying eight joints, base scarcely 

 incrassated ; pronotum rufous shading to fuscous posteriorly, borders 

 testaceous ; tegmina fuscous, distal half of mediastinal field and 

 centre of marginal field testaceous ; abdomen rufo-fuscous, cerci 



