Mr. C. O. Waterhouse on some Buprestidae. 105 



described as a distinct genus under the name Haplostethus. 

 If these species are to be considered as congeneric I see no 

 reason why the following species may not all be included in 

 the genus. There is considerable difference in the length of 

 the basal joint of the tarsi, in tiie prosternal antennal groove, 

 and in the form of the insects ; but these are probably only 

 specific differences. It seems to me not improbable that 

 when these small and apparently rare insects are better 

 known, the genus may be as world-wide in its distribution as 

 Agrilus. 



Two of the species I merely indicate without naming them, 

 as I have only single specimens in imperfect condition ; one 

 of them, moreover, is without locality. The species which I 

 have named M. iiniformis is the most distant from the type 

 species, its sculpture (both above and below) is peculiar, 

 appearing like flattened granules. M. Jelix and the two other 

 species indicated are near the typical Mastogenuis, but are 

 shorter, more convex, and have the thorax shaped more as in 

 Cardwphorus asellus &c. The difference in the form of the 

 apical segment of the abdomen may be sexual. 



Mastogenius uniformisj sp. n. 



Aureo-seneus, convexus, sat iiitidus, subtilitcr punctulatus ; capita 

 convexo, fronts vix canaliculata ; thorace lateribas leviter arcuatis, 

 basi truncate; elytris subparallelis, apice arcuatim attenuatis; 

 antennis pedibusque fere nigris, tarsis brevibus flavescentibus. 



Loag. 2 mill. 



Hob. Mount Gay Estate (leeward side), Grenada, W. I. 

 [H. H. Smith). 



I do not know of any Buprestid quite of this form ; it 

 reminds me somewhat of Aurigena in its outline, but has the 

 thorax rather broader and more convex. The surface, when 

 examined with the microscope, has somewhat the appearance 

 of leather. Head convex, finely and not very closely punc- 

 tured, with a slight median impressed line ; below with a 

 groove bordering the eye for the reception of the basal joints 

 of the antenna?, the groove continued on to the sternum, but 

 becoming gradually narrower and terminating about halfway 

 between the front margin and the coxte. Antennae as long as 

 the head and thorax together, the two basal joints moderately 

 stout, the third joint rather slender, the following joints 

 triangular, the terminal joint elliptical. Thorax transverse, 

 convex, almost rectilinear at the base, not much narrowed at 

 the base, arcuately rounded at the sides ; finely and not very 

 closely punctured. Scutellum rather small, curvilinear. 



