from the Rio Nautla, State of Vera Cruz. 31 



Soc. ii. pp. 78, 79). The latter name is preoccupied by 

 Macquart for a species described hy him from Gaiana. 



16. Cistogaster immaculata^ Macq., sens. str. 



Cistogaster iminaciilata, Mac, sens, str., nee Towns. Trans. Am. Ent. 

 Soc. xxii. p. 67. 



One male, March 18, San Rafael. 



On pages 66-67 of the Trans. Am. Ent. Soc. xxii. (1895) 

 I gave detailed notes of my own on two forms among the 

 females of what had previously been known as Cistogaster 

 divi'sa, Lw. I also presented some interesting notes sent me 

 by Mr. Charles Robertson on the separation of the males and 

 possible connexion of the two series of the latter with the two 

 female forms. I am inclined now to adopt this view, and 

 thus consider these two series as distinct species. The re- 

 marks that I made at end of page 67 on the names to be 

 used for the two forms should be corrected. Since writing 

 tliose remarks I have found that Macquart described the male 

 of the " dimorphic " female, while Loew described the male 

 of the '^ 72ormaV' female. Therefore the species possessing 

 the '• dimorphic " female will be known as G. immaculata, 

 Mcq., and that possessing the " normal " female will be 

 known as C. divisa, Lw. Walker's name occidua will re- 

 main a synonym of the latter. 



The present male specimen belongs to C. wnnaculafa, 

 Mcq., being the male form in which the median longitudinal 

 fuscous stripe of abdomen is wanting, which male should be 

 connected with the " dimorphic " female. Macquart's descrip- 

 tion leaves no doubt on this point, as he says of the abdomen 

 " une ligne dorsale de reflets d'un blanc jaunatre." He 

 describes the abdomen as ferruginous, the first segment with 

 a small dorsal triangular black spot, and the third segment 

 with jellowish-white pollinose reflections on each side. My 

 specimen has the median pollinose line and the pollinose 

 surface on each side of third segment golden instead of 

 yellowish white. The fourth segment is tinged with darker 

 and the golden pollinose covering extends over nearly the 

 whole of it. The deep golden yellow of sides of front 

 extends fully hallway down the sides of face. The whole 

 mesoscutura and scutellum are deep golden pollinose, the 

 former with median pair of linear darker vittee in front of 

 transverse suture and an outer heavier vitta on each side not 

 reaching front margin and broadly interrupted by suture. 

 Length nearly 6 millim. 



