206 PERCY SLADEN TRUST EXPEDITION 
Two structural points appear to have escaped notice hitherto : 
(1) The mentum, which is transverse, is deeply excavated in the middle in front: 
the front margin runs obliquely forwards on either side of the excavation: most of 
the surface (including the excavated part) is strongly rugose, near the posterior angles 
it is punctate. 
(II) The /ast ventral segment is almost truncate or perceptibly sinuate behind, and 
in the middle the hind margin is set with a series of minute setze rather like the teeth of 
a comb. They are pale in colour, and quite different from the ordinary pubescence of 
the segment, bemmg much stouter than the ordinary hairs: the sete in the middle 
of the series are shorter than those on either side. Insufficiency of material has 
prevented my determining whether this structure is confined to one sex, or present 
and of the same form in both sexes; in Philydrus parvulus sete of a somewhat 
similar kind are present in both sexes: see p. 204. 
Loc. Aldabra: Takamaka, 1908, 3 specimens (Fryer). Seychelles: Silhouette ; 
from a small pool on the plateau, Mare aux Cochons, over 1000 feet, 25. IX. 1908, 
1 specimen. Madagascar, British East Africa, Ceylon, [Sumatra ? |. 
Paromicrus, gen. nov. (Plate 14, figs. 1—11). 
Antenne 9-articulatee, articulis 7—9 clavam compactam formantibus. Labrum haud 
occultum, transversum. Palpi maxillares articulo 2° sat incrassato, 3° quam 2° breviore, 
4° quam 3° longiore. Mentum trapezoidale, transversum. Elytra seriebus regularibus 
punctorum munita. Ale perfecte. Prosternum breve, antice in medio elevatum sed 
haud carinatum. Mesosternum in medio elevatum; parte elevata haud carinata sed 
aream marginatam, antice in apicem ventraliter directum productam, formante. Meta- 
sternum in medio leviter elevatum, antice inter coxas intermedias productum, haud 
carinatum, cum mesosterno sutura transversd conjunctum. Segmentum abdominis basale 
in medio longitudinaliter carinatum. ‘Tarsi omnes 5-articulati, articulis 1—4 brevibus, 
subzequalibus, articulo 5 longiore. 
Genus Omicro affine, sed valde differt in forma mesosterni; metasterno in medio 
minus elevato, articulo 2° palporum maxillarium minus incrassato. 
Form oblong-oval (in Paromicrus atomus slightly narrowed behind), moderately 
convex, the upper surface bearing an extremely fine and scanty pubescence which is not 
easily visible without a compound microscope. Head short and broad, depressed in front 
of the eyes, which project subangularly, truncate in front. Antenne (Pl. 14, fig. 2) 
9-jointed in both sexes, the Ist joint elongate, 2nd short and broad, 3rd narrow, joints 
4—6 transverse and very short, 7—9 forming a compact club. Labrum (Pl. 14, figs. 3, 4) 
exposed, very short and transverse ; its front margin either shallowly smuate (P. carinatus 
and P. thomasseti) or angularly emarginate (P. atomus) on either side, and bearing a 
group of ciliz in the middle, and one on either side outside the sinuation. Mandibles 
(Pl. 14, fig. 5) rather delicate, without apical or other teeth. Mamille (Pl. 14, fig. 6) 
with the lobes membranous, the upper one with several regular rows of setze hooked at 
their extremities, the lower one with a minute ciliate process on its upper margin near 
