ZENILLIA AND ALLIED GENERA — SELLERS 



of authors can be referred to Aplomya Robineau-Desvoidy. Town- 

 send has described five genera which cover part of the material that 

 is placed in ZenilUa in this revision. Townsend places Zenillia in 

 the tribe Phrynoini: Hyphantrophaga, Eusisyropa, and Euexorista 

 in the tribe Trypherini ; Chrysomasicera in the tribe Phoroceratini ; 

 and Chrytioexorhta in the tribe Compsilurini. 



Eusisyropa of Aldrich and Webber (nee Townsend) approaches 

 more closely to generic concepts than any of the other proposed sub- 

 genera in their Zenillia complex. While omitting some of the Eus- 

 isyropa congeners, they have included species that Townsend referred 

 to the genera Hyphantrophaga, Eusisyropa, and Euexorista. 



The characters used to designate the genus Zenillia in this paper 

 are as follows : Abdomen in both sexes wide and deep, almost globose; 

 fourth segment, unless contracted in drying, closing in a slit above 

 the genital opening. Zenillia can be separated without difficulty 

 from Phryxe, Carcelia, /Sisyropa, Thelymyia, and Chrysophryxe. A 

 little practice should enable one to differentiate between Zenillia and 

 Aplomya, but in all cases caution is advised so that mistakes may 

 be avoided. Very few of the Nearctic species of Zenillia are bristly 

 on the facial ridges above the lowest one-third. 



The following grouping of the species treated in Zenillia is sug- 

 gested for those workers who prefer or insist on restricted genera or 

 a definition of species groups : 



1. libatrix (ZenilUa). 



2. futiUs (Euexorista). 



3. angustata. 



4. hyphantriae, euchaetiae, desmiae {Hyphantrophaga) . 



5. virilis. 



6. blandita. 



7. Wanda, loarmiae, tucumanensis, autographac (Eusisyropa). 



8. viridis, Hneata, marginata, taglinoi, facialis, daivsoni (Chrysoexorista) . 



9. ochracea, angustifrons, fulgoris (Chrysomasicera) . 



Additional specimens may enable us further to restrict group 8. 

 As no useful taxonomic or bionomic result can be achieved at this 

 time by placing these species groups in restricted genera, the genus 

 Zenillia is retained as proposed. 



The oviposition habits of some of the Zenillia congeners should be 

 mentioned to show a biological relationship in the genus. The 

 Palearctic species libatrix, porcula, and pullata, and the Nearctic 

 species futilis and blanda, including in all probability the species of 

 the Eusisyropa group, belong to Pantel's group 2, characterized by 

 small microtype eggs deposited on plant tissue, where they are con- 

 sumed by the host along with the tissue. As this type of oviposition 

 is associated with the typical shape of the abdomen cited, our future 



