308 Mr. J. llalfs on Spirulina and Coleoclisete. 



costa ; the outer margin is ochraceous brown, bordered internally 

 with black, externally with a bright silvery line, and marked to- 

 wards the apex between the nervules with three or more silvery 

 vittae. Posterior wings ochraceous brown, margined externally 

 by a silvery line ; a vitta in the cell, commencing above it at the 

 base of the subcostal nervure, a very slight one above the first 

 subcostal nervule, a long slender one below it, followed by four 

 very distinct ones in the interstices between the nervules, a longer 

 one extending to the base between the median and radial ner- 

 vures, and a similar one between the latter and the abdominal 

 margin bright silvery white, all except the two first-mentioned 

 connected with the marginal line. Cilia of the anterior wings 

 rufescent, darkest towards the anal angle ; of the posterior ochra- 

 ceous brown. 



Head brown ; antennse brown above, white below ; palpi light 

 brown. 



Thorax clothed with long brown hair ; legs very pale brown. 



Abdomen black above, very pale brown below. 



The female is smaller, much paler in colour ; the outer margin 

 of all the wings above, and of the anterior below, very pale brown ; 

 the apex of the anterior marked above with two silvery vittae, 

 their discoidal cell on both sides and that of the posterior above 

 with a fulvous vitta. 



In the collection of the British Museum, Mr. W.W. Saunders, 

 &c. 



The only specimens of this insect which I have seen were ob- 

 tained by P. Earl, Esq., who discovered them on a plain in the 

 southern island of New Zealand. The specific name was sug- 

 gested to me by Dr. Boisduval, who agreed with me in the opi- 

 nion that it was one of the most, if not the most, interesting spe- 

 cies of the family yet known. At present it is the only one from 

 New Zealand. 



XXXIII. — On the Genera SpiiTilina and Coleochsete. By John 

 Ralfs, Esq., M.R.C.S., Penzance*. 



[With a Plate.] 



Spirulina, Turpin {Kutz.). 



Filaments collected into a mucous film-like stratum, simple, 

 spiral, oscillating, ^inarticulate. ^^ — Kiitz. Phycologia Gene^^alis, 

 p. 182. 



Spirulina has its filaments interwoven into a thin stratum of 



* Read before the Botanical Society of Edinburgh, Dec. 12th, 1844, and 

 Jan. 9th, 1845. 



