of Insects and other Annulosa. 345 



cumdata prope mediam, linea transversa brunnescenti-undulata 

 fasciaque macular! indistincta, maculis subcinereis postice obscu- 

 rioribus, alis inferis lineis 2 transversis undulatis brunnescentibus, 

 fasciaque macular! subcinerea ; corpore ochraceo-aurantiaco. Exp. 

 alai*. unc. ^\ {S)- 

 Hah. Australia ? Brit. Mus. 



The two species of moths, described above, are alluded to in a 

 paper laid before the Entomological Society of London, Oct. 6, 

 1843, containing remarks on the fenestration in the wings of Sa- 

 turnia, prefatory to a notice of the remarkably grooved and tense 

 undulating-surfaced tympanum on the upper wing of the genus 

 Hecatesia. In the Saturnia division of Bombycidce, these fenestrse, 

 when they occur, seem to be common to both sexes, and appear 

 to be merely ornamental ; they are sometimes quite obsolete ; in 

 Hecatesia they are limited, I believe, to one sex, and, as was re- 

 marked in the appendix to Capt. Grey^s ' Travels,^ the individuals 

 possessing them make a remarkable noise, as was told me by that 

 excellent observer Capt. George Grey, now in S. Australia. I 

 wish that some competent physiologist would thoroughly examine 

 this beautiful tympanoid membrane, and explain how the noise 

 could be produced by the insect, and whether or not the fenestra 

 has any connexion with the noise. 



Crustacea. 



Decapoda. 



9. Atelecyclus spinosulus. White. Carapace as long as broad, with 

 the surface granulated and rather uneven. In front, between the 

 orbits, the carapace projects, but not so far as the end of the eye ; 

 the projecting part ends in a strong tooth ; the sides of the cara- 

 pace are spinulose and have five indistinct teeth. The hands are 

 externally rough with spines, and have on the upper edge a series 

 of larger teeth and a row of longish hairs. Colour above red 

 spotted with white, beneath entirely white. 



Hah. Falkland Islands ( W. E. Wright, Esq.). Brit. Mus. 



This species comes near the Atelecyclus Chilensis of Edwards in 

 marks and general appearance, but in the form of the .carapace 

 resembles A. heterodon of Leach. 



ISOPODA. 



10. Sphceroma gigas (var. lanceolata), White. Body smooth, last joint 

 of the abdomen considerably arched above, and having near the base 

 a slight elevation grooved in the middle ; the last joint is also in 

 most of the specimens considerably pointed, and extends very 

 slightly beyond the extremity of the inner plate of the last false 

 legs ; the outer plate of these appendices is narrow and lanceolate ; 

 both of the plates are minutely punctured with black. 



Hah. Falkland Islands (W. E.Wright, Esq.); Salvador Bay, under 

 stones, very common. Brit. Mus. 



