288 IMv. R. I. Pocock on some 



much smaller, almost as much of the second seg- 

 ment visible from above as of the first, the latter 

 not extending beyond the middle of the femur of 

 palp ; maxillar}' process of second leg relatively 

 small. 

 a^. The anterior portion of the carapace produced 

 forwards and upwards into a bluut interocular 

 beak ; the last tergite of the abdomen with two 

 large tubercles ; coxa of third leg furnished at 

 the base with a forwardly-directed spiniform 



process Hosei, sp. n. 



i'. The anterior portion of the carapace low, with at 

 most a small prominence ; last tergite of abdo- 

 men without tubercles ; coxa of third leg 

 without basal spiniform process tnincatus, Thor, 



The type of the genus, 0. Doria>, and the remaining 

 species, 0. Fece^ which seem to be closely allied, will fall, 

 apparently, alongside of Hosei under section ci} of the above 

 table ; but there is no mention in the description of either of 

 them of the presence of a spiniform process on the coxa of 

 the third leg. 0. Fcce is said to differ from 0. Dorice in having 

 the dorsal part of the abdominal n*gion longer, namely, more 

 than three times as long as the carapace instead of two and a 

 half times, the femur of the palp having only one tubercle 

 below at the base instead of two, &c. In Hosei there is no 

 tubercle in this position. 



Of the Singapore species 0. trimcatus the British ^Museum 

 has from time to time received a number of specimens trom 

 Ih. H. N. Ridley. 



Suborder A N E P l G N A T il l, Thorell. 

 (Ann. ;Mus. Genov. 1882, p. •2-2.) 



Family Sironidae, Simon. 



Genus Pettalus, Thor. 

 (Ann. Mus. Geuov. viii. p. 409 (187(5).) 



This genus was founded by Thorell for the reception of 

 the species from Ceylon described by Cambridge as Cyph- 

 cphtliaJmus cimiciformis (Ann. & ^lag. Nat. Hist. (4) xvi. 

 pp. 388-381), pi. xiii. fig. 3, 1875). The characters upon which 

 it was based and distinguished from Siro [Cyphojtthahnus) were 

 the alleged presence of a fourth segment on the mandibles 

 and the bifurcation of the last dorsal plate of the abdomen. 



In the species of this genus, however, that I have seen 

 tliere is no fourth segment on the mandible and the bifurca- 

 tion of the abdominal segment may be almost absent, varying 

 within the limits of the same species. Apart from this 



