158 LEPIDOPTERA. 



amongst some Brifish insects sent to him for determination 

 by Dr. Knaggs. 



I may add tliat the original specimens of Cuneatella in 

 my collection, and which I had thought might have been 

 worn {specimens of 3Iuscosella, are veritably Cuneatella, 

 though not as fine as the specimens I have received from 

 Professor Zeller. 



Cemiostoma orobi, n. sp. In October, 1867, Mr. T. 

 Wilkinson, of Scarborough, sent me for examination a spe- 

 cimen of a Cemiostoma^ yfh.\c\i he had bred from larvae feed- 

 ing in the leaves of Orobus tuberosus. This certainly seemed 

 distinct, but it would have been hazardous to have described 

 it from a single specimen. Having now received seven more 

 bred specimens from Mr. Wilkinson I need no longer hesitate 

 to assign to it specific rank, and to endeavour to indicate to 

 others wherein it differs from its congeners. 



In the first place I should point out that we really require 

 some new instrument, a goniometer, to measure the angles 

 formed by the radiating dark lines in the cilia of the anterior 

 wing's of a Cemiostoma. 



This new species is closely allied to Cemiostoma lathyri- 

 foliella and C. Wailesella, and is thus much smaller than 

 C. spartifoliella and C. laburnella. The angle formed by 

 the two last radiating dark lines of the cilia in Orobi is 

 scarcely more than 15 degrees. I believe in both Lathyri- 

 foUella and Wailesella it is 30 degrees. In the closer 

 proximity of the two costal spots Orobi resembles Lathyri- 

 foliellaf but I believe the anterior wings are rather narrower 

 than in that species. The question will naturally arise has 

 every genus oi Leguminos(E a species of Cemiostoma peculiar 

 to itself? and, if so, how are we ultimately to learn to dis- 

 tinguish the individual species? Scifella always appears to 



