258 Mr. R. Shelford's Studies of the Blattidie. 



antennee with basal half incrassated, black, a luteous band occupying 

 five joints beyond the middle. Prothorax luteous with a pyriform 

 black central marking, the point directed backwards. Tegmina 

 ferruginous at the base ; the mediastinal field hyaline, the marginal 

 field flavo-hyaline with intervenular streaks of opaque testaceous ; 

 aj^ex of tegmina flavo-hyaline, the veins ferruginous. Wings flavo- 

 hyaline. Legs, abdomen, and cerci bright luteous, the coxa; at their 

 extreme bases outwardly tipped with black and with pale borders. 

 Cerci elongate. Supra-anal lamina triangular, produced. 

 Total length 12 mm. ; length of tegmina 10 mm. 



Three examples {W. F. H. Roscnherg coll., Dec. 1896). 

 (Oxford Museum.) 



Named after Mr. Malcolm Burr to whose generosity the 

 Oxford Museum owes a magnificent collection of exotic 

 Orthoptera. 



The species differs from P. angusta, Wlk., in the follow- 

 ing points : — The less extent of the white band on the 

 antennse, the different shape of the black disc of the 

 pronotum, the testaceous stripes on the tegmina. 



16. P. discicollis, Burm. (Mexico.) (Plate, XIV, fig. 2.) 



Blatta discicollis, Burmeister, I.e. p. 1012 (1838); de 

 Saussure, Mem. Mex. Blatt. p. 114 (1864). 



Thyrsoccra discicollis, Brunner, I.e. p. 123, n. 10 (1865). 



Thyrsoccrct laticornis, var., de Saussure and Zehntner. 

 Biol. Centr.-Amer. Orth. i, p. 32, n. 2 (1893). 



This is a very well-marked species, and the most robust 

 of the genus. The type, of which I have a drawing, is at 

 Berlin ; another example is in the collection of Central 

 American Orthoptera in the British Museum, and stands 

 under the name of P. laticornis, Perty ; a third, from which 

 the following description is drawn up, is in the Oxford 

 Museum. 



$ . Head and mouth parts black, antenneo mutilated (in the 

 type, very long, black at base with a testaceous annulus occupying 

 nineteen joints about the middle of total length, beyond the middle 

 fuscous). Pronotum almost orbicular, but truncate in front, not 

 covering the vertex and produced behind, disc piceous with broad 

 lateral borders of orange-yellow, the posterior border margined 

 with a fine yellow line ; the black of the disc which just fails to 

 meet the yellow anterior margin is narrowed anteriorly. Tegmina 



