Manchester Memoirs, Vol. xlii. (1898), No. 11 53 



broader than it, largel}^ developed behind the e}^es ; the 

 apex of the clypeus in $ produced into two stout teeth ; 

 the sides of the head, on the lower side behind, largely 

 triangularly produced. Labial palpi 4-, maxillary 6- 

 jointed ; the first joint of maxillary half the length of the 

 2nd; the 2nd to 5th almost equal in length; the 6th a 

 little longer. Mandibles in $ very large, curved, dilated 

 towards the apex, which is itself prolonged into a long, 

 stout tooth issuing from the middle of the dilated part; 

 the middle with a long furrow in the centre. Labrum at 

 top ending in a triangular point; the maxilla moderately 

 large; the 2-5 joints almost equal in length, the 6th joint 

 a little longer than the first. Body in ? and c^ moderately, 

 the legs densely, pilose; the claws with a stout tooth in 

 the middle. Mesonotum with a narrow, but distinct, 

 furrow down the sides, but not reaching the base or apex, 

 and a less distinct, shallower furrow down the middle. 

 Median segment without a distinct enclosed or striated 

 space in the centre at the base. Prothorax transverse at 

 the top, sharply raised there and at the sides. Pterostigma 

 moderately large and elongate; the first cubital cellule 

 somewhat longer than the second and third cellules united ; 

 the third cubital cellule narrow, not much more than half 

 the length of the first; the first recurrent nervure almost 

 interstitial ; the second received close to the third trans- 

 verse cubital nervure. Abdomen smooth and shining; the 

 apical segments densely covered with long hair ; the 

 ventral segments densely fringed with long hair; the 

 apical segments with a rima, as in Halictus. 



The presence of a rima on the apical abdominal seg- 

 ment and the form of the alar neuration ally this genus 

 to Halictus, nor is the structure of the trophi enough to 

 separate it generically from that genus, while the ? again 

 agrees with it in having an elongated face; the median 

 segment in both sexes wants the enclosed space at the 



