62 • Mr. E. S. Russell on Depastrum cyatliiforme. 



in Cuba *, R. laticauda in Venezuela and Colombia, wliereag 

 the only examples of R. agamemnon and R. Borellii liitherto 

 known are labelled " Brazil," without further particulars. 

 Thanks, however, to Burchell, we are now aware that 

 R. Borellii is found in the Province of Goyaz, in the 

 upper valley of the Rio Tocantins or that of at least one of 

 its tributaries. Burcliell was at Porto Real (now Porto 

 Nacional) when he made his note on specimen no. 1274. 

 Burchell's collection also contains another specimen of the 

 same species (a female) bearing a label " Body and legs 

 redish. Between the boxes at our station at Sape. 

 15. 10. 28." Referring to the Index we find that Burchell 

 gives " S^ Brigida " as his locality on Oct. 15, 1828. Sapd 

 is mentioned on Oct. 14. The position is between Caval- 

 canti, his resting-place on Sept. 30th, and Concei^ao, which 

 he reached on Oct. 18th, but apparently much nearer to the 

 latter. A glance at Plate III. will show the positions of these 

 two localities of R. Borellii. 



So far as the function of the organ in these American 

 Buthidge is concerned, it need only be said that since it is 

 equally well developed in both sexes, and occurs also in 

 immature forms, there is no reason to suppose that it has any 

 sexual significance. Hence, like the stridulating-organs of 

 other scorpions and of the spiders of the family AviculariidaSj 

 its significance must be regarded as purely aposematic. 



EXPLANATION OF TLATE IV. 



Fig. 1. RhojHilurus Borellii, Poc, 5? ''^^^- size; drawn from t^^plcal 



example. 

 Fig. 2. Ditto. Ventral surface of anterior extremity of abdomen and of 



posterior extremity of cephalothorax, to show the granular 



areas on the first abdominal steruite, the pecten of the left side 



being removed. 

 Fig. 3. Ditto. Piece of the pecten seen from its dorsal side, to show the 



finely ridged stridulating area. 

 Fig. 4. Mhojialurus junceus (Herbst). Ditto. 



V. — Notes on Depastrum cyathiforme, Gosse. 

 Qj E. S. Russell. 



[Plate v.] 



M. Sars, in 1846, was the first to describe and figure this 

 interesting little Lucernarian. He discovered it near Bergen 

 and described it under the name of Lucernaria cyathiformis 



* There are specimens in the British Museum labelled " Mexico " and 

 "Brazil." These localities, however, require confirmation. 



