424 APiD^. 



abdominal segments with a distinct transverse groove across the 

 middle. Black, the abdomen obscurely chalybeous ; the face, the 

 sides of the thorax, and median segment with thin wliite pubescence ; 

 the postscutellum, a broadly interrupted band at the base of the 1st 

 abdominal segment, and eutire regular transverse bands at the 

 base of segments 2-5 covered with snow-white pubescence ; 

 the legs with pale glittering pubescence, the tarsi and anal rima 

 fulvous ; wings hyaline and iridescent, nervures ferruginous. 



c? similar, more elongate; antennae rufo-piceous ; the whole 

 thorax and abdomen with a chalybeous tinge. 



Hah. Punjab. $ . Length 9-11 ; exp. 16-18 mm. S • Length 7 ; 

 exp. 12 mm. 



The types of both H. albescens and H. albozonatus are in the 

 British Museum ; the latter was described from a fresh, the former 

 from a faded specimen. I cannot find any structural differences 

 between the two. 



727. Halictus tristis, Vachal, Ann. Mus. Civ. Gen. (2*) xiv, 1894, 



p. 438, $ . 



2 . Head and thorax minutely and closely punctured ; abdomen 

 glabrous and shining ; head in front very slightly elongate ; eyes 

 not convergent below ; the face above the clypeus convex, with a 

 medial vertical carina between the bases of the anteunse ; median 

 segment quadrate, posteriorly truncate and slightly compressed ; 

 a medial vertical carina down the posterior face of the truncated 

 portion, the space at base with outwardly divergent striae. Black ; 

 the clypeus and front with sparse, the pronotum, sides of the 

 thorax and median segment, and base of the abdomen with thicker 

 white pubescence, the postscutellum covered with the same ; legs 

 with long white pubescence, and transverse bands of white pubes- 

 cence along the bases of abdominal segments 2-4 ; wings hyaline, 

 nervures and tegulae dark brown. 



Hah. Karen Hills, Burma. $ . Lengtli 7 ; exp. 14 mm. 



728. Halictus semiaeriims, Vachal, Ann. Mus. Civ. Gen. (2") xiv, 



1894, p. 443, 2 ■ 



5 . Head densely, thorax more sparsely punctured ; abdomen 

 smooth and shining ; face elongate above ; the clypeus convex, 

 with a vertical short carina ; median segment truncate posteriorly, 

 the sides and the apex above margined ; the lunate space at base 

 with outwardly divergent striae ; abdomen broadly oval. Black, 

 the mesonotum having an aeneous tint in certain lights ; the legs 

 covered with pale glittering hairs ; the tarsi and the anal rima 

 rufo-testaceous ; the postscutellum with dense sordid white pubes- 

 cence ; wings hyaUne, slightly dusky, nervures testaceous. 



Hah. Karen Hills, Burma. $ . Length 5 ; e.ip. 11 mm. 



729. Halictus catullus, Vachal, Ann. Mus. Civ. Gen. (2*) xiv, 1894, 



p.437, $. 



§ . Head and thorax densely and finely punctured ; abdomen 



