246 PERCY SLADEN TRUST EXPEDITION 



Pheropsophus Solier, Ann. Soc. ent. France, ser. 1, ii. 1833, p. 461. 



28. Pheropsophus humeralis Chaudoir, var. ? 



Pheropsophus humeralis Chaudoir, Bull. Mosc, iv. 1843, p. 710; AUuaud, Liste 

 Coleopt., p. 51, and footnote 4. 



Pheropsophus omostigma Chaudoir, Ann. Soc. ent. Belgique, xix. 1876, p. 39. 



The collection contains a single specimen of a Pheropsophus from Aldabra. Monsieiir 

 Lesne, to whom it was sent for examination, informs me that it does not appear to him to 

 differ from the species in the Paris Museum which bears the name of P. humeralis 

 Chaudoir. On the other hand I have compared it with two specimens in the British 

 Museum named P. humeralis Chaud., one of which, received from Oberthiir, bears his 

 label stating that it was compared with the Type of the species ; and there are certain 

 differences between the Aldabra specimen and these two specimens. The Aldabra 

 specimen has the shoulders of the elytra slightly less prominent. It has the light-coloured 

 humeral mark much reduced, forming only a fine fleck. Chaudoir, however, in discussing 

 this species (Ann. Soc. ent. Belgique, xix. 1876, p. 39), remarks that the humeral mark 

 is " quelquefois presque effacde." The Aldabra specimen is 18 mm. long: it is rather 

 light in colour, decidedly lighter than the two specimens in the British Museum ; the 

 ground-colour of the elytra is brown, not black, which agrees with Chaudou-'s statement 

 in the article just cited, that the " couleur du fond n'est pas noire, mais toujours brune " ; 

 the legs (excepting the dark marks at the apices of the femora) and light parts of the 

 head and underside are of a light yellowish-testaceous ; the dark mark on the vertex 

 is strongly emarginate in front, somewhat narrower behind, and reaches back to the 

 anterior margin of the thorax. As there is only one specimen, and as the British Museum 

 specimens are not enough to indicate the extent of individual variation in the form of 

 the shoulders, etc., it is not easy to decide whether the Aldabra specimen should be 

 considered as a distinct species or as a form of P. humeralis, but I have decided to retain 

 it under that name. Wings can be seen under the elytra of the specimen. 



Loc. Aldabra: Takamaka, 1907 (Thomasset). P. humeralis Chaud. is known from 

 Madagascar. 



Tetragonoderus Dejean, Spec. Col., iv. 1829, p. 485. 



29. Tetragonoderus hilunatus, Klug. 



Tetragonoderus hilunatus Klug, Ins. Madag., Abh. Ak. Wiss. Berlin, 1832, i. p. 135 ; 

 Alluaud, Liste Coleopt., p. 42 ; Kolbe, Abh. Senckenb. Ges., xxvi. 1902, p. 572, and Mitt. 

 ZooL Mus. Berlin, v. 1910, p. 17. 



A series of about 41 <^ and 32 ?. I have mounted the elytra and wings of several 

 specimens and find the wings well-developed : a large $ has the elytron 3f mm. long, 

 wing 6^ mm. ; a small $ has the elytron 3 mm. long, wing 4| mm. ; 3 $ have each the 

 elytron 3 mm. long, wing 5 mm. 



