152 Mr. H. Eltringliam's Monogra^jih of the 



There are before me $ examples of an intermediate form 

 of the pndorina subspecies which show traces of the f -w. 

 subapical spots as developed in the manca form, but the 

 structure of the % genital plate is quite different and con- 

 forms to that of other $$ of acrita. 



But for the above facts I should be inclined to regard 

 the manca form as a distinct species, such a view being 

 strongly supported by the difference in the structure of 

 the abdominal plate. I do not however feel justified in 

 assigning specific rank to the present form so long as we 

 possess so few examples. 



It will be understood that the various subspecies of 

 acrita above described overlap in their geographical distri- 

 bution and that intermediate forms are liable to occur, 

 which fact combined with the general tendency to melanic 

 development in the wet season, furnishes material for a 

 very wide range of individual variation. 



As a result many form names have been published in 

 connection with this species, these being enumerated in 

 the synonymy already given. Though many of these are 

 of little systematic importance it is necessary for the 

 completion of the present work that these form names 

 should as far as possible be identified. A key has recently 

 been published by Dr. Strand of Berlin (/. c. sup.), who 

 also made several additions to the list. I give below 

 those to which allusion lias not already been made in the 

 foregoing descriptions, together with notes as to the 

 apparent systematic position of each form. 



f. aquilia, Thurau, is a wet season $ of acrita littoralis. 



f utengulensis, Thurau, appears to be a wet season ^ of 

 acrita pudorina. 



f. hclla, Weymer, is a dry season ^ of acrita hellona. 



f. chaeribulula, Strand, is apparently an intermediate ^ 

 of acrita littoralis. 



f. aqiiilina, Strand, appears to be a wet season ^ some- 

 what intermediate between acrita acrita and acrita 

 littoralis. 



f. msamvjicte, Strand, is a wet season ^ of acrita acrita. 



f. usaramensis, Strand , is a wet season ^ of acrita littoralis. 



f. nyassicola, Strand, is an intermediate ^^ of acrita acrita. 



