iSgi.] 



THE BRITISH NATURALIST. 



73 



cabinet series. I therefore determined I would make the experiments 

 myself, and being unprejudiced, would lay the results faithfully before 

 those interested. With this view I gathered together as many 

 specimens as I could and I beg publicly to thank Mr. Robson, Mr. 

 Harwood, of Colchester, and Mr. Stott of Bolton, for a very liberal 

 supply of most beautiful forms for examination, these with my own 

 specimens, collected in Suffolk, Staffordshire, and Cheshire, gave me a 

 fairly representative selection to work upon. The specimens were 

 prepared exactly as described by me in the "Young Naturalist," for 

 1889, vol. x., page 51, and I at once saw that the two forms of wing 

 markings, presented equally different forms in the structure of the 

 genital appendages. The following is a description of the points of 

 difference in each, which with the aid of the rather rough but accu- 

 rately drawn figures, will enable any one to immediately separate 



even the most obscure specimens. The figures were drawn with the aid 

 of an eye piece micrometer, and therefore the difference in the 



size of the figures is correct, the magnification being the same in 



each instance. 



MiANA FASCiUNCULA has the large outside appendages, in the form 

 • of a bird's head with a long beak, there are a few small hooks on the 

 crown, and also at the tip of the beak ; a little lower down there is a 

 long narrow almost parallel projection terminating in a rounded end ; 

 at the top of the figure is seen an organ the shape of which is the most 

 distinctive character, the two sides are parallel for nearly the whole 

 length, when they suddenly narrow off into a bulbed point ; the portion 

 to which this organ is joined will be noticed to be broad, it narrows off 



