58 p. CAMEEON. 



This species agrees so very closely with R. argentatum Fab., sec. Saussure, Stett. Ent. Zeit. 

 XXIII. p. 187 (cf. Cameron, Ann. and Mag. Nat. Hist, Dec. 1900, p. 531), that it might 

 readily be mistaken for it. It may be known from it by the pronotum behind being sharply 

 keeled, by the propleurae being bordered before and behind by flat, shining keels ; the 

 third cubital cellule at the bottom is broader, being as wide there as the space bounded 

 by the first recurrent and the second transverse cubital nervures, whereas in argentatum it 

 is not half the length. 



cf. Antennae covered with a f)ale down ; the hook is brownish, stout, slightly curved ; 

 with its pedicle it is fully longer than the joint. The front, the eye incision, and the 

 lower half of the outer orbits are thickly covered with silvery pubescence ; the vertex with 

 griseous hair. The front and vertex are closely and strongly punctured ; the space between 

 the antennae bears a narrow, but distinct, keel. The clypeus at its greatest width is nearly 

 as long as its length ; above it is transverse and bordered with a yellow band ; the upper 

 half is distinctly punctured ; the lower is alutaceous and impunctate ; the apex is broadly 

 and roundly incised ; its sides have an oblique slope. Thorax strongly and closely punctured, 

 except on the apex of the meso- and on the basal half of the metapleurae. The pro- 

 thorax at the base all round is bordered by a sharp keel ; the furrow above the middle 

 of the mesopleurae is distinct ; the base below is smooth. The sides of the median segment 

 are broadly rounded and bear neither teeth nor spines; its apex has an almost perpendicular 

 slope and is almost transverse ; above in the middle it is very slightly developed ; it is 

 smooth, except round the edges ; the central furrow is deep and distinct on the upper half. 

 Legs densely pruinose, as is also the abdomen. The basal segment of the abdomen is clearly 

 separated from the second. 



The % has the clypeus punctured all over and it wants the white line on the top ; 

 it is more convex above and is more broadly and, not quite so deeply, incised at the apex ; 

 the median segment is more fully developed, and in the centre it is finely, transversely striated. 

 The wings in both sexes are deeply violaceous. 



ANTHOPHILA. 



Fam. Apidae. 



1.5. Halictus minikoiensis, sp. nov. 



Niger, dense griseo piloso ; tarsis longe fulvo pilosis ; alls hyalinis ; stigmate testaceo, nervis 

 fuscis. $ et cf. 

 Long. 8 mm. 

 Hah. Minikoi, Laccadives. 



Antennae black ; the flagellum tending to brownish near the apex and covered with a pale 

 pile. The ocellar region is smooth and shining; the rest of the vertex and front closely and 

 distinctly punctured. The face is roundly convex in the middle and is clearly separated from 

 the clypeus; and is there almost impunctate. Clypeus rather strongly, but not very closely 

 punctured, except at the apex, which is transverse ; the extreme apex is depressed, brownish in 

 tint and slightly projects at the ends. The hair is griseous, long and moderately thick on 

 the front and face ; sparser and shorter on the other parts. Mandibles brownish in the 



