1154 Insects. 



Genus. — Stems, Latreille, Panzer, Serville. St. Fargeau. 

 Megilla, Fab. Trachusa, Jurine. Apis, Kirby. 



Two subrnarginal cells. Maxillary palpi two-jointed. 



Sp. 1. Stelis aterrima, Latreille. 



Female. — Length 4 lines. Black, closely punctured. A very thin 

 cinereous pubescence on the head and thorax. A short tooth on each 

 side of the scutellum, which is subemarginate. Apical margin of the 

 wings fuscous, darkest in the marginal cell. Abdomen convex, mar- 

 gins of the segments piceous, the terminal segment somewhat angular. 



Male. — Length, 3 — 4 lines. Black, closely punctured. The face 

 thinly clothed with hoary pubescence, as well as the sides of the tho- 

 rax and a few scattered hairs on the metathorax. The scutellum has 

 an obtuse tooth on each side. The wings have their margins clouded, 

 darkest in the marginal cell. Abdomen, the margins of the first four 

 segments piceous, the seventh rounded, entire. 



I am not aware that the male of this species has been previously 

 described ; it was not known to Mr. Kirby, nor is it described by St. 

 Fargeau. This is a scarce insect. I have met with the male at Da- 

 rent, in Hampshire and at Weybridge. I only once took the female, 

 at Birch Wood, Kent. 



Sp. 2. Stelis phceoptera, Latreille. 



Female. — Length, 4 — 4j lines. Black. The face has a little hoary 

 pubescence along the margin of the eyes, which also thinly clothes 

 the sides of the thorax. Scutellum rotundate, not toothed. Wings 

 fuscous, with a darker cloud on their margins, darkest in the margi- 

 nal cell. The legs have a little hoary pubescence, the calcaria testa- 

 ceous and claws ferruginous. The margins of the abdominal seg- 

 ments have a little hoary pubescence ; the abdomen is convex above, 

 slightly incurved, and the apical segments acute. 



Male. — Length, 3 — 4 lines. Black, punctured, clothed with a very 

 thin hoary pubescence : closely resembling the female. The seventh 

 segment entire. 



This is a scarce insect. I have only found it in one locality, viz., 

 in the Battersea fields, about an old outhouse, entering the burrows 

 of Osmia hirta in the old posts. I have observed that it frequents 

 the flowers of the common mallow. 



