252 Mr. K. Shelford's Studies of the Blattidie. 



trouble to determine with accuracy those species that are 

 contained in the Oxford Museum, and I think that the 

 subjoined list and notes made in the course of my labours 

 may be of assistance to other workers in this order of 

 Insects. I should like to record here my grateful thanks 

 to Dr. O. Taschenberg of the Halle Museum who kindly 

 lent me the type of P. affinis, Burm., and one or two other 

 interesting examples of the genus ; also to Dr. A. Brauer 

 of Berlin for admirable drawings of the types of P.Jlavipes, 

 Burm., P. anmdicornis, Burm., Blatta discoidalis, Burm., 

 and B. discicollis, Burm. 



List of Species of the Genus Pseudomops, Serv. 



I. Cerci not spatulate. 



1. P. oUongata, L. (SURINAM.) 



Blatta oUongata, Linnaeus, Syst. Nat. (ed. x), i, p. 425, 

 n. 9 (1758) ; De Geer, Mem. Ins. iii, p. 541, pi. 44, 

 fif. 11, 12 (1773). 



Thyrsoeera oUongata, Burmeister, Handb. Ent. ii, p. 449, 

 n. 8 (1838). 



In spite of de Geer's admirable description and readily 

 recognizable figure, subsequent authors have confused 

 another species, P. interccpta, Burm., with this, explaining 

 discrepancies in appearance as due to variability ; the 

 pattern of the pronotum is so different in the two species 

 that I see no valid reason for confounding them. The 

 general colour of the insect is fulvous and the disc of the 

 pronotum is marked by two dark points which may be 

 joined and by a crescentic dark band near the posterior 

 margin. 



2. P. intercepta, Burm. (Mexico, Guatemala, Hon- 



duras.) 



Blatta intercepta, Burmeister, 1. c. p. 497, n. 10 (1838) ; 



de Saussure, Mem. Mex. Blatt, p. 113 (1864). 

 Pseudomops oUongata, Serville, Ins. Orth. p. 115 (1839). 

 Thyrsoeera oUongata, Brunner, Nouv. Syst. d. Blatt. p. 



121, n. 8, pi. iii, f. 11 (1865) ; de Saussure, Miss. Mex. 



Orth. p. 50, pi. i, f. 29 (1870) ; de Saussure and 



Zehntner, Biol. Centr.-Amer. Orth. i,p. 32, a 3 (1893). 



