( X ) 



cation of this weed he had repeated opportunities of witnessing ; 

 but they seemed to prefer that which was submerged, as they 

 were more abundant on the steps below water, except where 

 basking in the sun." 



Prof. Meldola exhibited, on behalf of Dr. Fritz Miiller, the 

 following fig-insects from the neighbourhood of the Itajahy River, 

 South America : — 1. Tetrcqnis auiericamis, female. '2. Do., male. 

 3. Critogaster nuda {iemale). 4. Do., male (winged and wingless). 

 5. C. 2)ilivL'iitris, iem-dle. 6. Do., male. 7. C. sm^^u^aWs, female 

 (= Trichaidiis versicolor, female). 8. Do., male. 9. Tetra- 

 gonaspis (most or all of the specimens will probably be T. gracili- 

 cornis). 10. Ganosoma atteuuatum, etc. (males of No. 9). 11. 

 Diomorus variabilis, female. 13. Do., male. 13. Physothorax 

 di.scJ(7er (wingless male of No. 11). 14. Colyostichus longicaudis, 

 female. 15. Do., male. 16. Heterandriuvi longipes (wingless 

 male of No. 14). 17. Aepocerus infiaticeps (wingless males). 



Papers read. 



Dr. Fritz Miiller communicated the following notes on Fig 

 Insects : — 



"In his valuable paper on fig-insects (Feigen Insecten. Wien, 

 1885), Gustav Mayr has described thirty-seven species, which 

 some years ago I had gathered on the River Itajahy. Among 

 these there are four new genera {Nannocerus, Physothorax, Crito- 

 gaster, and Ganosoma) established on wingless males, while there 

 is but one genus {Tetragonaspis) of which females only are 

 described. Thus Gustav Mayr was led to think that without 

 doubt one sex only of several genera was represented among the 

 insects at his disposal. This, however, is not the case. By 

 carefully collecting the insects from a large number of figs, and 

 examining separately those taken from each fig, I have been able to 

 refer all of these genera of wingless males to females of other genera. 



" Ganosoma is the wingless male of Tetragonaspis, as was 

 already suspected by G. Mayr, G. robustum being the male of T. 

 flavicollis, and G. attenuatum (pro parte) that of T. gracilicornls. 



" Critogaster is the wingless male of Trichaulus, C. singularis 

 being the male of T. versicolor, female [T. versicolor, male, I 

 suspect to be the winged male to C. nuda). When I formerly 

 collected the fig insects of Pharmacosycea, to which the genera 

 Tetrapus and Critogaster appear to be limited, I had met with 



