384 PERCY SLADEN TRUST EXPEDITION 
joint is very similar to that of C. picee Ratz., and the lateral margination of the prothorax 
is like that of C. abietis and C. picew Ratz. 
Dissection shows that the anterior inner surface of the prothorax in the male is 
provided with a transverse carina similar to that on the head, but having on its edge and 
front side (which is somewhat convex) a series of minute longitudinal ridges, forming what 
is probably a stridulating area, whilst the strongly developed carina on the head, which is 
certainly capable of being withdrawn under the prothorax by an upward movement of the 
head, may act as a scraper. 
Mr Charles J. Gahan, in his very interesting paper on “Stridulating Organs in 
Coleoptera” (Trans. Ent. Soc. London, 1900, Pt. IIL, p. 4386), describes a somewhat 
similar apparatus in Spilispa imperialis Baly, but the position of the file and scraper are 
there reversed, and the shape of both parts are very different to those of C. trypanus ; in 
the female of C. trypanus the inner surface of the prothorax is quite smooth. 
50 specimens. 
Loc. Seychelles. Silhouette ; from near Mont Pot-d-eau, ca. 1500 feet, and 
Mare aux Cochons and high forest above, VIII.—1IX. 1908. Mahé: high forest of Morne 
Blane and Morne Pilot, up to ca. 2000 feet, X.—XI. 1908; high forest between Trois 
Freres and Morne Seychellois, 1500—2000 feet, XII. 1908; Mare aux Cochons district, 
1000—2000 feet, I.—II. 1909, including some specimens from stunted “ capucin ” 
(Northea) forest on summit of “ Montagne Anse Major,” over 2000 feet. Marie Anne 
Island: XII. 1908, one specimen. 
On one occasion a number of specimens were captured, one after the other, flymg in 
broad daylight in a small space among the trees in the high mountain-forest of Mahé. 
STEPHANODERES Hichh. 
5. Stephanoderes communis Schauf., Tijdschr. Ent., xxxiv. 1891, p. 11. 
For the same reason as that given regarding Xyleborus madagascariensis, these — 
insects are placed provisionally in the above species ; they slightly exceed the length 
given in the description (14 mm.) and the interstices are not costate. 
Loc. Seychelles. Mahé: Mare aux Cochons district, over 1000 feet, I.—II. 1909, 
one specimen; Long Island, VII. 1908, two specimens. Madagascar. 
6. Stephanoderes vulgaris Schauf., Tijdschr. Ent., xl. 1897, p. 209; Kolbe, Mitt. 
Zool. Mus. Berlin, v. 1910, p. 40. 
Not obtained by the Percy Sladen Trust Expedition. 
Loc. Seychelles: La Digue, 1892 (Alluaud). 
Nors. There are several undetermined specimens of Cryphalus from Silhouette and 
Mahé, and there is one undetermined specimen of Stephanoderes from Silhouette. 
