Mr. C. C. Blake on the Discovet-y of Macraucheuia in Bolivia. 441 



middle, curved in a circular form, and within the curvature a 

 black spine enveloped in membrane and directed obliquely for- 

 wards and downwards; the palpal organs are of a reddish-brown 

 colour. 



Falces conical, armed with a few teeth on the inner surface ; 

 rather darker-coloured than the legs, and inclined towards the 

 sternum. 



Maxill<B short, obliquely truncated at the end on the outer 

 side, and inclined towards the labium. 



Labium semicircular, prominent at the top, and, with the 

 maxillse and sternum (which latter is broad, convex, and heart- 

 shaped), of a dark-brown colour. 



Abdomen oviform, thinly clothed with hairs, and projecting 

 but slightly over the cephalothorax. Colour brownish black. 



The female differs from the male only in being rather larger 

 and in having the frontal prominence smaller ; the sexual organs 

 are highly developed and very prominent. 



Adult males and females of this very active species were taken 

 (but rarely) by myself, under pieces of rock and stone, near 

 Pennsylvania Castle, in the island of Portland, in July 1860. 

 It seems to be allied to Walckena'era antica [W. apicata of 

 Blackwall, Linn. Trans, xviii. 637, — Argus anticus, Walckenaer, 

 Hist. Nat. des Insectes Apt. t. ii. p. 357), resembling it in the 

 relative colouring of the legs, but differing from it remarkably, 

 both in the form of the cephalothorax and also of the radial 

 joint of the palpi and in the structure of the palpal organs ; it is 

 likewise much smaller, and far less richly coloured. 



L. — On the Discovery of Macrauchenia in Bolivia. 

 By Charles Carter Blake. 



To the Editors of the Annals and Magazine of Natural History. 



Gentlemen, 



In the February Number of the ' Quarterly Journal of the 

 Geological Society,' a report of a paper appeared, read by Prof. 

 Huxley on Nov. 31, 1860, respecting "a new species of Maci-au- 

 chenia {M. boliviensis) " obtained by Mr. Forbes from the mines 

 of Corocoro, in Bolivia. In this paper the following note is 

 inserted : — 



" As the Guanaco ranges into the highlands, it may not be a 

 too sanguine expectation to hope for the future discovery of 

 remains of the great Macrauchenia, also, in Bolivia" (p. 83). 



As this statement, unaccompanied by any reference to the 

 corroborative testimony of other palaeontologists, is calculated to 



Ann. S^ May. N. Hist. Ser. 3. Fo/. vii. 29 



