AROIDEAE 495 



2918. A. filiforme Blume. The remarks made by Delpino in No. 2925 apply 

 here also. 



943. Helicodiceros Schott. 



2919. H. muscivorus Engl. Arcangeli states that this species is pollinated 

 by flies (species of Somomyia and Calliphora) : 378 insects (371 flies and 7 beetles) 

 were observed in one inflorescence. In opposition to Schnetzler, Arcangeli is of 



Fig. 412. Helicodiceros muscivorus, EngL (after A. Engler). Lower part of spadix and spathe. 

 The upper part of the former (not figured) resembles the lower part. 



opinion that insects visiting the inflorescences only efi"ect crossing, and do not serve 

 as nourishment for the plant, as the necessary secretory organs are absent from the 

 inflorescences, and the fly-larvae developing in it live for some time. 



944. Satiromatum Schott. 



2920. S. guttatum Schott. Delpino (Malpighia, Genova, iv, 1890) states 

 that the flower mechanism of this species resembles those of Arum italicum Mill, and 

 A. maculatum Z. 



945. Amorphophallus Blume. 



2921. A. Rivieri Dur. Pirotta (Nuovo Giorn. bot. ital., Firenze, xxi, 1889, 

 p. 156) says that a plant of this species cultivated in the Rome Botanic Garden is 

 necrocoleopterophilous, for 122 carrion-beetles were once found in the inflorescence, 

 these belonging to nine species and six genera : Saprinus nitidulus F. (65) was the 

 most numerous, and S. aeneus F. (30) came next. 



2922. A. Titanum Becc. (Beccari, Bull. R. soc. tosc. ort., Firenze, xiv, 



