OCR Text |
Show 1874.] MR. GARROD ON THE " SHOW-OFF " IN BUSTARDS. 673 Genus TETTIGONIA, Fabricius. T E T T I G O N I A ELVINA, n. sp. Head, thorax, and scutellum above dull blue-black ; abdomen purplish brown above; anal segments and sides orange ; tegmina 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 margin 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\ millims. ; exp. tegm. 17. Hab. St. Paulo, Amazons (Bates). B.M. Genus LEDROPSIS, White. L E D R O P S I S C O C C I N E A , 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 . G A R R O D , 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 m y 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 m y mind, the difficulties connected with that somewhat involved subject. M y 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 m e 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 know the age of the young male bird above referred to, which I have recently examined. It seemed of nearly full size, had |