338 



sented (? always) on the edge of the body. The pores situated upon 

 the surface of the terga above the lateral margin. The terga without 

 or with scarcely a trace of a median dorsal suture. 



The head and anal valves not largely overlapped by the 1 st and last 

 terga respectively. 



Legs longer or shorter, but their coxae are close together in the 

 middle line, the sternal area being scarcely apparent. 



Siphonotus, Brandt. 

 Bull. Sc. Ac. St. Petersburg I, no. 23, p. 179, 1837. 



Resembling Polyzonium but with the body long and slender and 

 the antennae separated by a relatively wide frontal space; with a 

 single ocellus on each side. (? always). 

 Type S. brasiliensis, Brandt. 



The type of tbis genus is unknown to me ; but I have seen several 

 species from different parts of the tropics, which agree closely with 

 Brandt's generic description. 



It is not improbable that the discovery of fresh forms will show 

 that the genera Polyzonium and Siphonotus pass into one another. 

 P. germanicum is the only species of the former known to me, and 

 it is recognisable from the species that I refer to Siphonotus by its 

 broad leech-like body, by the narrow frontal space between the an- 

 tennae and by the presence of 3 (? more) ocelli on each side of the head. 



35. Siphonotus formosus sp. n. PI. XX, fig. 5 — 5a. 

 Java: Tjibodas; several specimens. 



Colour black or bluish gray , with a wide median dorsal longitudinal 

 band; the firt two and last two segments also white; face, antennae 

 and legs infuscate. 



Head hairy below. 



Antennae longer than the head, narrower at the base and at the 

 apex than at the 4 th and 5 th segments. 



Body strongly convex above, flat below very finely hairy, atten- 

 uated anteriorly and posteriorly, the posterior half of each segment 

 higher than the anterior, the lateral margin thickened. The anterior 

 pore larger than the rest. 



Legs short , entirely covered , the 6th segment long and slender , the 

 rest of the segments subequal in length. 



