D. Keilin 
157 
denser than that of Dendrorhynchus. In some specimens of Dendrorhynchus it 
was rather difficult to ascertain that the transverse fibrils were only superficial 
and did not penetrate deeper in the endoplasm and form a series of septae 
similar to those of Taeniocystis mira described by Leger (1906). The endoplasm 
is very granular, the granules being disposed in transverse parallel planes. 
The vesicular nucleus, with usually several karyosomes, is situated in the 
anterior portion of the gregarine. I have not yet been able to find the sexu¬ 
ally associated forms, though several times I found the subspherical cysts, 
60 to 80/x in diameter, but unfortunately none of these cysts showed the 
spores. On the other hand in several young Systenus larvae, containing the 
trophozoites of Dendrorhynchus, I found the cysts of elongated shape, about 
100/x long, measuring 40 ^x across their widest portion and having one side 
prominent and the other flattened (PI. X, fig. 13). These cysts, which pro¬ 
bably belong to the same gregarine, contained ripe spindle-shaped s v pores 
18-19/x long and 7 /x wide (PL X, figs. 14 and 15). 
Text-fig. 2. Dendrorhynchus systeni : a portion of a trophozoite fixed and stained, showing 
myocyte fibrils. 
The shape of the epimerite of this gregarine recalls that of Rhopalonia Stella 
Leger and Echinomera liispida (Schneider) Labbe, and I am inclined to think 
that the genus Dendrorhynchus can be placed near the latter two genera in the 
family of Dactylophoridae Leger (1892). 
It is interesting to note that the Systenus larva, the host of Dendrorhynchus , 
often contains a Schizogregarine bearing much resemblance to Schizocystis 
gregarinoides Leger (1910), which ; with Taeniocystis mira Leger (1906), live 
in the larvae of Ceratopogon soltitialis. 
REFERENCES. 
Leqer. L. (1892). Recherches sur les Gregarines. These, published in Tableltes Zootogiques, 
pp. 1-182, Pis i-xxii. 
- (1906). Ltilde sur Taeniocystis mira Leger, Gregarine m6tam6rique. Arch. f. Protist. 
vii. 307-329, Pis xii-xiii. 
