384 EXPLANATION OF THE PLATES. 



Pig. 



3. Male of Ibla Cumingii ; labrum and palpi, as seen 



with the eye on a level with 

 the summit of the mouth. 



4. „ „ „ Posterior cirrus (h in fig. 2) 



much magnified. 



5. „ „ „ Larval antennae; from the 



terminal point of the body 

 (e in fig. 1), as seen with 

 a ^th of an inch object glass. 



6. „ „ „ Outer maxillae. 



7. „ „ „ Mandibles, with the underly- 



ing articulated membrane, 

 forming the side of the 

 mouth. 



8. „ „ „ Maxillae, with the apodeme. 



9. Complemental Male of Scalpellum vulgar e 9 attached 



over the fold in the occludent margin of the 

 scutum of the hermaphrodite. 



(a.) Orifice of the sack of the male. 



(5.) Spinose projections above the rudimental 

 valves ; at the bottom of the figure are repre- 

 sented, as seen through the wdiole thickness of 

 the animal, the prehensile larval antennae. 



(d.) The depression for the attachment of the ad- 

 ductor scutorum muscle of the hermaphrodite ; 

 see fig. 15#'. 



(e, e.) A transparent layer of chitine, which forms 

 a border to the occludent margin of the scutum 

 of the hermaphrodite. This border supports 

 long spines, which are connected with the un- 

 derlying corium by sinuous tubuli. 



10. The basal (normally anterior) portion of the above 



complemental Male, greatly magnified, viewed 

 dor sally from above, exhibiting the larval pre- 

 hensile antennae, attached to the antero-sternal 

 surface of the animal. 



