22 Mr. IT. Scott on Corylopliida;/Vo?» the 



in Malie, from country above Port Glaud, 500-1000 feet, 

 and from the forest ou Cascade Estate, between 800 and 

 2000 feet ; Praslin, Cotes d'Or Estate. 



Lewisium, Matthews. 

 (PI. III. figs. 25-28, 30; PI. I\^ figs. 31, 32, 34, 35.) 



Leivisium, Matthews, Mon. Corj^lopliiclae, 1899, p. 164, pi. v. fig. A. 



Lewisium. was established for two species — L. cet/Jonicum, 

 Mattli. {op. cit. p. 166), and L. Japonicum, Matth. [op. cit. 

 p. 167), and no further representative of the genus has since 

 been described. My material contains a long series of a 

 species from the Seychelles, which is referred to Lewisium 

 on account of its A^ery close general resemblance to L. cey- 

 lonicum, but which in the form of its antennae and mouth- 

 parts differs from that species and in some ways more closely 

 resembles CatojAyx howringi, Mattii. (Java), the type of 

 ihe genus Caloptt/x'^. The Seychelles form {L. seychellea- 

 num, sp. n.) thus seems in some respects intermediate between 

 the types of Leicisiuni and Catopiyx, and an examination of 

 the actual parts in L. ceylonicum and L. seychelleanum, and 

 comparison with Matthews's figures of Catopfy.v renders one 

 rather doubtful whether the differences between Leioisium and 

 Catoptyx are more than s))ecific. But one of the chief 

 diagnostic characters of Catoptyx is that it has the anterior 

 angles of the pronotinn abruptly inflexed and closely fitted to 

 the sides of the head, and of this there is no trace in L. sey- 

 chelleanum. Therefore I do not propose to sink Lewisium as 

 a synon3'm of tlie earlier name Catoptyx. 



Anteti7ia', mcuth-j^arts, &c. — The antenna of L. seychelle- 

 anum (figs. 25, 25 a) has the basal joint much thicker, the 

 third joint ])roportionately mnoh longer, thanthat of L. cey- 

 lonicum (figs. 2&, 2Qa). This forms a ready means of 

 distinction in balsam-preparations. The labrum of L. sey- 

 chelleanum (fig. 27) is intermediate between that of Lewisium 

 and that of Catoptyx hoicringi as fiuured by Matthews 

 (co])ied in figs. 28, 29), being considerably more tapering 

 than the former but much less acuminate than the latter. 

 The mandibles of L. seychelleanum are bifid at the distal 

 extremity, each of the two apices being armed with two or 

 three books (figs. 30, 30 a)' — i. e., rather more complex than 

 those of Catoptyx bouringi, which, according to Matthews 

 (pi. vi. fig. B4), iiave only a single hook at each apex, but 



* Ccttnptyx, Mattlie%vp, Ann. & INIag. Nat. Hist. (5) vol. xix. 1887, 

 p. Ill ; Mon. CorUopliidiip, p. 107, pi. vi. tig, B 1-7. 



