Notes on Fig-Insects. 1 1 67 



the hind legs and of tlie genital armature of the male is quite the same in the 

 two forms. The wingless males (Physothorax) are incomparably less frcqiient in 

 this species than the winged ones. 



"As Plesiostigma bicolor, of which G. Mayr dcscribed winged males, is 

 nearly allied to Diomorus, I think it to be rather probable that Physothorax 

 anmiliger should be the wingless male of this species. I did not see, this year, 

 either of these two forms; perhaps they may be only aberrant forms of the Poly- 

 morphie Diomorus variabilis, of which I have even seen two wingless females. 



"Naittiocertis biarticulaUts is the wingless male of a Diomorus, distinguished 

 from D. variabilis by its ovipositor being shorter than the body, while it is con- 

 siderably longer in D. variabilis. The galls, of which I have seen but very few 

 as yet, are pedunculated, while those of D. variabilis, of which I have gathcred 

 more than 800, are always sessile with a broad basis. I have not yet seen the 

 winged male of this Diomorus. 



"Of the genus Heterandrium G. Mayr describes two species of wingless 

 males (H. longipes and H. nudiventre), which he could not refer to any female. 

 Now H. longipes is the wingless male of Colyostichus longicaudis, and H. nudi- 

 ventre that of C. brevicaiidis. 



"Thus we have among the fig-insects of the Itajahy at least seven trimorphic 

 species, consisting of females, winged and wingless males, viz., Critogaster mida, 

 C. piliveiitris, Diomorus variabilis (Physothorax disciger), Heterandriutn uni- 

 anmdatum, H. longipes (Colyostichus longicaudis), H. nudiventre (C. brevi- 

 caudis), and Aepocerus inflaticeps (the female of which is A. emarginatus). To 

 these probably may be added Diomorus sp. ( Nannoceriis biarticidatus) and 

 Plesiostigma bicolor (Physothorax annuliger) . 



"In the Old World but one trimorphic species of fig-insects has as yet been 

 found, viz., Crossogaster triformis, G. Mayr." 



