1916.] 



'/ 



265 



Journal the mechanism by which pollination is brought about : 

 and to her remarks the only thing that I find to add is, that I 

 suspect the presence in the chamber of two smelling compounds 

 on account of the way in which the odour of the inflorescence 

 is at one time strongly offensive and at another not exactly 

 offensive. 



Arisaema speciosum, Mart. Small Diptera were found 

 within the spathe on the mountain of Tonglu, Sikkim 

 Himalaya (18-V-09). 



Sauromatum guttatum, Schott. At Pathankot in the 

 Panjab the following visitors to the flowers were observed : 

 HYMENOPTERA. Aculeata. Apiidae, 1 sp.; LEPIDOP- 

 TERA, 1 moth: DIPTERA, several spp.; COLEOPTERA, 

 several spp. (7-iii-02). 



Ant-patrols and extrafloral nectaries. 



Mention has been made above of the ant-bodyguard of the 

 Cassias. On Cassia hirsuta, Linn., the extrafloral nectaries at 

 which the ants feed are particularly well developed , not being 

 in any way diminished in size as the leaves pass over into 

 bracts. Ants were observed on them at Dibrugarh (20-xi-ll), 

 and in addition a small winged Hymenopteron was obtaining 

 food from them. A black ant has been observed at the 

 corresponding extrafloral nectaries of Cassia occidentalis, 

 Linn. (Dinajpur, 15-viii-06). At the same place and on the 

 same date a wasp was seen visiting the extrafloral nectaries of 



Cassia Tora, Linn. . 



The species of ant making the patrol varies; and on 



Impatiens tripetala two different species have been noted in 

 the same neighbourhood (Goalpara, 3-ix-06). The ant which 

 lives in Calcutta on the inflorescences of Thunbergia grandi- 

 flora, Roxb., is again a distinct species from these, being also 

 of much smaller size ; but an ant of the same size lives on them 

 at Gauhati (2-ix-06). 



* 



