Male Genital Armature of the Derma'ptera. Part III. 



ChcVtospania tlioracica Dohrn. 



Metaparameres broadest in the middle, abruptly attenuate at 

 the apex, the right side more dilated about the middle tlian the 

 left. The virga is sinuate, not very long, rather dilated towards 

 the base, the end of the ejaculatory duct being distinct in my 

 specimen ; near the apex of the virga are a number of minute 

 spots which appear to be glands or cellular nuclei (PI. II, fig. 3). 



Ch/etospania aiistralica Borm. 



Metaparameres narrow, lanceolate, of equal width, subsinuate ; 

 proparameres with no spongy dilations ; virga nearly straight, 

 long, with complex chitin-armature at base (PI. II, fig. 4). 



Prolabia unidentata Beauv. 



This specimen, from Cuba, has the metaparameres of a Forficu- 

 line type, that is, long and straight, almost parallel-sided, and 

 rounded at the tips ; the lateral spongiform areas are distinct ; the 

 virga is bent at the base and surrounded with a faint spiral 

 structure like a trachea ; the preputial sac is entirely filled with a 

 dense, fibrous, denticulate armature (PI. II, fig. 5, a and l). 



In general, one of the chief features of the Labiine genitalia is 

 the acuteness of the metaparameres. These are of eight types. 



1. Broad at base, the inner margin straight, but outer margin 

 strongly concave {SjDongovostox sehlaferi and ♦S'. tripunctata). 



2. Narrow, the outer margin sinuous, and tips recurved (aS*. 

 rubber, and fig. 20 of Zacher, 8. assiniensis, S. conraclti, Nesogaster 

 ruficeps). 



3. Narrow, and straiglit {Irdex nitidipennis, Chc'etosp>c{nia 

 australica, Labia marginalis). 



4. Inner margin straight, broad, and parallel-sided nearly 

 to tip, then abruptly narrowed by concavity of outer margin 

 {C. pittarellii). 



5. Narrow, both margins sinuate {G. stiletta). 



(5. Broad at base, tapering, the sides straight {Hoviotages feie). 



7. Broad and parallel-sided, abruptly but symmetrically 

 narrowed and acuminate at tip (Marava doddi, C. thoracica). 



8. Narrow, external margin concave, recurved {Metasparatta 

 chaconsis, " Parasparatta schotti " of Zacher). 



Probably a greater diversity of form will be shown when further 

 material is examined. 



