New Sjtecies of Staphylinidae from Singapore. 251 



^. Eighth dorsal segment with the posterior border deeply emar- 

 ginate on eitlier side, the emargination bounded externally by a 

 sharp slightly incurved spine and with a sharp, short triangular 

 tooth on citlier side of the middle line separated by a small notcli ; the 

 extremities of both the teeth and spines being on the same level. 



Hah. Mandai, in rotten fungus. 



109. Heterota arenaria, n. sp. 



Black, with greasy lustre, the olyti'a witli an indeterminate orange 

 spot occupying the sutural region towards the apex. Antennae, 

 month-parts and legs reddish-testaceous. Length 2 mm. 



Extremely similar to Alianta [Heterota) pictipennis* Fauv., the 

 only differences being that the coriaceous sculpture at the bases 

 of the abdominal segments is much coarser, the puncturation of the 

 sixth and seventh segments is less fine and more asperate and the 

 orange spot on the elytra is more diffuse and tends to spread towards 

 the humeral angles, and the palpi arc reddish- testaceous in the present 

 species. Head transverse, the eyes rather large but not prominent, 

 tlie temples convergent and but little rounded posteriorly, very finely 

 and moderately closely punctured, densely and finely coriaceous, 

 with very fine greyish pubescence. Antennae with the 1st joint 

 shorter than the 2nd, the 3rd longer than the preceding, the 4th and 

 5th a little longer than broad, the 6th as long as broad, the 7th to 

 the 10th transverse giadually increasing in breadth, the 11th fully as 

 long as the two preceding together, conical. Thorax slightly trans- 

 verse, widest about the middle, from thence the sides rounded and 

 contracted anteriorly, more strongly contracted in a nearly straight 

 line to the obtuse jiosterior angles; the base obscurely bifoveolate 

 before the scutellum, the disc in the middle rather broadly impressed 

 throughout nearly the whole length, but less broadly in front; 

 pimcturation, ground-sculpture and pubescence similar to that of 

 tlie liead. Scutellum triangular, densely coriaceous, the margins 

 towards the apex sliining. Elytra longer and broader than the 

 thorax, as long as broad, scarcely punctured, densely and finely cori- 

 aceous, with a finely granular appearance; pubescence as on the 

 thorax. Abdomen more shining than the fore-parts, the bases of 

 tlie segments densely and rather coarsely coriaceous, the third, 

 fourth and fifth segments with a transverse row of fine asperate 

 punctures at the apices, the sixth, seventh and eighth segments 

 finely, asperately and sparingly punctured. 



Hab. Seaweed on sandy beach at Changi. 



* As pointed out by me in Ent. Mo. Mag., vol. liv, 1918, p. 183, 

 this insect belongs to the genus Heterota. 



