36 DE. AV. T. OILMAN ON A COLLECTION OF 



Hyastenus Brockii, Dc Man. 



Hyastenus Brockii, De Man, Arch. Naturg. liii. (1) 1887, p. 221, pi. vii. figs. 1 a-6; Henderson, 

 Trans. Liun. Soc, (2) Zool. v. p. 344 (1893). 



A single very imperfect dried specimen ( <s ) appears to agree with De Man's description 

 and figures of this species. The total length is about 15 mm., half of which is taken up 

 by the slender rostral spines. The carapace is narrower and the rostral spines less 

 widely divergent than in the figure. The tubercles on the carapace are only very slightly 

 marked, but the arrangement, so far as can be seen, corresponds with De Man's account. 

 The structure of the orbital region agrees closely with the figure. 



Locality. " Toi-res Straits." 



Distribution. Amboina {De 3Ian) ; Gulf of Martaban {Henderson). 



Hyastenus vekrucosipes (Adams & White). (Plate 2. figs. 23 & 24.) 



Chorinus verrucosipes, Adams & White, Zool. Voy. ' Samarang,' Crust, p. 13, pi. ii. fig. 3 (1848). 

 Hyastenus verrucosipes, A. Milne-Edwards, N. Arch. Mus. Paris, viii. p. 250 (1852) (name only). 

 Paramithrax verrucosipes, Miers, Ann. Mag. Nat. Hist. (5) iv. 1879, p. 10 (name only). 



This species, which does not ajipear to have been reobserved since its discovery, is 

 represented in the collection by two female specimens agreeing so closely with the 

 original type specimen of Adams and White as to leave no doubt of their identity. The 

 surface of the carapace is rather more uneven than is represented in the figure given by 

 these authors, and it is slightly more contracted behind the orbital region, so that the 

 postorbital processes appear more prominent. The ujoper hiatus of the orbit is rather 

 more open in our specimens than in the type, and the rostral spines are distinctly 

 knobbed at the tip. The first j)air of Avalking-legs are relatively longer than in the 

 figure, and the dactyls, especially of the last pair, are longer and more slender. The legs 

 in our specimens do not present the "wart-like tubercles" described by Adams and 

 White ; but I am inclined to think, after examining the now somewhat imperfect type 

 specimen, that these tubercles are simply tufts of hair agglutinated together by drying. 



As regards the systematic jwsition of this species, Prof. A. Milne-Edwards doubtfully 

 includes it in his list of the species of Hijastenus, while Miers incidentally refers to it as 

 a Parcmiithrax. The type specimen in the British Museum is now labelled Acanthophrys 

 verrticosij)es, and I am informed that this name was given to it by Mr. Miers. 



It seems plain, however, that this species cannot be referred to Farctmitlirax, since 

 there is only one hiatus instead of two in the upper margin of the orbit, or, in other 

 words, the spine which, in that genus, intervenes between the supra-ocular hood and the 

 postorbital process is here wanting. The condition of the orbital region is most closely 

 paralleled by Dana's figures of his Lahaina ovata (U.S. Expl. Exp., Crust, i. p. 93, pi. ii. 

 figs. 1 a-c). The svipra-ocular hood is very prominent, having the corners produced and 

 the anterior one acute and curved forwards ; the long postocular process is cupped, or 

 rather grooved, along its anterior face for the reception of the eye ; the basal antennal 

 joint carries a small spine distally on the ventral surface, and two smaller tubercles in a 



