SCOTT—COLEOPTERA; HYDROPHILIDA, HISTERID Ai 231 
linea transversi crenulato-punctata parum arcuaté, spatio inter hane lineam et basin 
impunctato ; elytris tenuiter haud dense punctatis; pygidio fere impunctato; prosterno 
inter strias circa dimidio longiore quam basi lato, striis antice divergentibus ; mesosterno 
strid marginali integri; lined transvers’ punctorum elongatorum inter meso- et 
metasternum ; metasterno in medio fere impunctato, ad latera sat fortiter haud dense 
punctato ; segmento primo abdominis fere impunctato. Long. corp. { mm. 
Rather narrowly oval, moderately convex, shining, pitchy-ferruginous with legs and 
antennze paler. Head appearing impunctate, but under a high power a few very fine 
punctures are visible; no suture between frons and clypeus can be seen. The punctures 
on the prothorax are spaced out, separated usually by about twice their own diameter : in 
front of the base in the middle is a slightly arcuate crenate-punctate line, the space 
between it and the base being impunctate and not impressed; this line is not continued 
laterally to the posterior angles of the thorax. The elytral punctures are slightly less 
strong than those on the thorax, shallow and spaced out, so that except under a high 
power the elytra sometimes appear impunctate. I have had difficulty in satisfactorily 
making out the pygidial punctuation: the propygidiwm appears to be excessively finely 
punctulate, the pygidiwm almost impunctate. The prosternum (PI. 14, fig. 28) between 
the striz is about 14 times as long as its breadth at the base ; the strize are very slightly 
nearer together in the middle than at the base, in front they diverge rather widely. 
Mesosternum (Pl. 14, fig. 28) with marginal stria entire, with the surface bearing a few 
excessively fine punctures only visible under a high power: separated from the 
metasternum by a chain of strong longitudinally-elongated depressions. Metasternum 
almost impunctate in the middle, rather strongly but not closely punctate at the sides. 
First abdominal segment almost impunctate, with a few punctures visible under a high 
power. 
Characterised by its rather narrowly oval and convex form, numerous but not dense 
punctures, the presence of the arcuate punctate line at the base of the thorax, and of the 
transverse series of elongate punctures between meso- and metasternum. 
This species is dedicated to Monsieur E. Dauban, owner of the island of Silhouette, 
in which all 3 specimens were found. 
Loc. Seychelles. Silhouette: found, together with many Bacanius ambiguus, 
under bark of a felled dicotyledonous tree among coconut-plantations near coast, Pointe 
Etienne, 17. IX. 1908, 2 specimens; found under bark of partly decayed stem of a 
Dracena, together with several Bacanius ambiguus, in forest near Mare aux Cochons, IX. 
1908, 1 specimen. 
35. Acritus (Ailetes) davidsoni, sp. nov. (Plate 14, figs. 29, 30). 
Sat late ovalis, parum depressus, nitidus, piceo-ferrugineus, antennis pedibusque 
dilutioribus ; capite subtilissime haud dense punctulato; prothorace elytrisque dense 
striolato-punctatis, striolis ad mediam basin prothoracis et ad angulos internos basales 
elytrorum convergentibus; prothorace serie basali punctorum munito; pygidio dense 
subtiliter striolato-punctulato, striolis transversis; prosterno inter strias subtilissime 
punctulato, parum longiore quam basi lato, antice et postice fere wque lato, im medio 
30—2 
