ANOPLURORUM BRITANNIA. 243 



taken from the Snow Bunting (Emberiza nivalis),and should 

 have considered these two as the P. irascens, being, how- 

 ever, without the ferruginous margin to the abdomen, I 

 felt I was not justified in adopting that name. But as I 

 have said elsewhere, it is my wish that the specific names, 

 which I attach, be considered as provisional only, as here- 

 after some may eventually prove varieties. Therefore, if 

 the insects now alluded to should be considered by Dr. 

 Burmeister as varieties of his P. irascens, I bow with sub- 

 mission to his judgment. I have in my possession two spe- 

 cimens of the same size, but white, with the head pale tes- 

 taceous, which were found on the Blue Titmouse (Parus 

 cceruleus) ; but as these may owe their paleness to having 

 recently changed their skin, I would not venture to describe 

 them, until more specimens occur of the same character. 

 It may not be out of place here to remark, that I think 

 this sub-genus, and the preceding Laemobothriwn, which 

 agree in some respects, ought to be removed from the genus 

 Liotheum, as they differ considerably in general appearance 

 from the remaining sub-genera ; and further, the number of 

 segments in the abdomen is not the same. These two hav- 

 ing but nine, while the others have ten ; which number is in 

 accordance with the generic character, as laid down by the 

 late Professor Nitzsch. I make this assertion with great 

 deference to the opinion of the author just named, and not 

 out of any captious spirit to lessen the well-earned fame of 

 so able and indefatigable a naturalist. As, however, my task 

 compelled me to figure the species, I could not insert a 

 greater number of segments than I had been able to ob- 

 serve myself, and therefore felt I was called upon to state 

 why I had so represented these two Sub-Genera. 



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