244 proceedings of the academy of [may,. 



Comparison of Chlorolestes (fasciatus) with Phenacolestes. 



{Ch.fasciatus, 2 cf Natal, 1 cT "Pirie Bush, S. Africa, A. N. Stenning 

 98-191"; all -S^^ ji^ the British Museum.) 



These two genera agree in the characters above numl:)ered 5, 6, 

 7^46 8^9,48 10,49 156, 16, 18,5« and 22. 



These two genera differ in the characters given below; after each 

 number the difference shown by Chlorolestes is stated. 



1. Nodus at four-fifteenths ( =.27) of the wing-length. 



2. Only two antenodals.^^ 



3. Postnodals on the front wings 22-23, on the hind wings 17-20. 



4. Stigma less oblique. 



11. Rs separates one to two cells distad to the subnodus, but in all 



cases nearer to Ms than to M1+2. 



12. Between Rs and Ms is one row of cells which may increase to two 



rows at the extreme margin, symmetrically or asymmetrically. 



13. Arculus at the second antenodal. 



14. Ms separating from M1+2 at the subnodus. 



15a. Between Ms and M4 are no cross-veins proximal to the level of 

 the subnodus, the first cross-vein being very nearly at, but 

 still slightly distal to, the level of the subnodus. 



17. Between M4 and Cui are (a) two to three antenodal cells (sensu 

 Selysii) and (6) one row of cells to the wing-margin. 



19. Between Cui and Cu2 is one row of cells to the wing-margin. 



20. Area posterior to Cu2 with only one row of cells. 



21. Anal vein separating from the hind wing-margin at, or slightly 



distal to, the level of the middle of the lower side of the quadri- 

 lateral, therefore far distad (a) to the level of the arculus and 

 (6) to that of the cubito-anal cross-vein. 



Various Old World Genera and Phenacolestes. 

 The genus Wahnesia Forster, of New Guinea, has the area posterior 

 to Cu2 fairly well developed, but not to the extent that it is in Phena- 

 colestes, but as this genus differs from Phenacolestes in a number of 

 characters, such as Nos. 2, 9, 11, 13, 14, 21, 22, a more detailed 

 comparison has not been made. 



^5 These three males have a brown band for the full width of the wing from the 

 origin of M2 distad to half-way from this point to the proximal end of the stigma. 



^ Occasionally increasing to two rows at the extreme margin. 



<^ Each one of the three rows may divide, however, into two rows at the extreme 

 margin. 



*3 M2 separates from Mi at .28 to .33 of the distance from nodus to stigma. 



■'^ At the extreme margin there are 5-7 rows, however; but compare p. 229, 

 antea. 



50 The cubito-anal cross-vein is nearer to the level of the first than to that of 

 the second antenodal. 



5^ One of the Natal males has on the right hind wing an additional antenodal 

 proximal to the normal first and confined to the costal area. 



