1874.] MR. GARROD ON THE " SHOW-OFF " IN BUSTARDS. 673 



Genus Tettigonia, Fabricius. 

 Tettigonia elvina, n. sp. 



Head, thorax, and scutellum above dull blue- black ; abdomeu 

 purplish brown above ; anal segments and sides orange ; tegtnina 

 subhyaline ; basal two thirds divided abruptly and longitudinally 

 into two areas, the anterior one testaceous, terminating on costal 

 margin in a crimson-edged triangular white spot, the posterior one 

 chocolate-brown ; an oblique brown stria from middle of costal mar- 

 gin to centre of limitation of the testaceous area ; terminal third 

 bright orange, its outer margin blackish, its inner margin whitish 

 hyaline ; a rounded black subapical spot, partially edged internally 

 with white ; a larger blackish spot at external angle, and a small dot 

 on inner margin ; wings pale brown ; body below testaceous ; face 

 whitish. Length of body 5| minims. ; exp. tegm. 17. 



Hah. St. Paulo, Amazons {Bates). B.M. 



Genus Ledropsis, White. 

 Ledropsis coccinea, n. sp. 



Body above, tegmina, and veins of wings scarlet ; ground of wings 

 hyaline white ; below bright stramineous, with the front and sides 

 of cephalic process, the sides of thorax, and the upperside of the 

 tibiae and tarsi of legs scarlet. Length 10 millims. ; exp. tegm. 14. 



Hab. N. Australia. From Mr. Saunders's collection. B.M. 



Form of L. naso of Walker. 



3. Further Note on the Mechanism of the ''Show-off" in 

 Bustards. By A. H. Garrod, B.A., F.Z.S., Fellow of 

 St. John's College, Cambridge, Prosector to the Society. 



[Received November 24, 1874.] 



It is the uncertainty with which my material comes to hand which 

 must be my excuse for having so soon to present a further note on 

 the "show-off" in the Bustards. 



A young male specimen of the Great Bustard (Otis tarda) has 

 recently died in the Society's Gardens ; and one or two observations 

 which I was able to make on its gular arrangements have done much 

 to clear up, in my mind, the difficulties connected with that some- 

 what involved subject. My previous communication on this point 

 (P. Z. S. 1874, p. 471) contains a drawing of the oesophagus, 

 trachea, and gular pouch of a Spanish specimen of Otis tarda, 

 kindly given me by Lord Lilford. In the description appended to 

 the woodcut it is remarked that the crop is peculiar, in that it 

 springs from the posterior instead of the anterior wall of the 

 oesophagus ; and I may mention that it is further peculiar in 

 not being quite median, as would have been expected. 



I do not kuow the age of the young male bird above referred to, 

 which I have recently examined. It seemed of nearly full size, had 



