224 Mr. E. Sannders' Synojms of 



with dense fringes of black-brown hairs ; apical dorsal valves very 

 narrow and pointed ; segments beneath with fringes of dull golden 

 hairs. Legs clothed on their outer sides with pale, somewhat 

 silvery, hairs. Length, 9 — 10 mm. 



Hab. Common in many localities in July and August, 

 and may generally be traced by the high pitched note of 

 its flight. Frequents labiate plants. 



Cebatina, Latr. 

 Latr., Hist. Nat. Ins., xiv., p. 50. 



Wings with three submarginal cells ; labial palpi 4-jointed ; 

 maxillary palpi 6-jointed ; $ with six ventral segments of the abdo- 

 men exposed ; anal opening mferior ; genital armature rather 

 stout; base of the sagittae covered with a membrane; $ without 

 apparent pollen-brush. 



Of this small genus of glabrous, blue, or metallic- 

 coloured bees we have only one species in England whose 

 capture has been really well authenticated. It is closely 

 allied to the large Xylocopa, so well known on the Conti- 

 nent; and therefore, although in our limited list it seems 

 to be somewhat out of place near Psithyrus, that is 

 where it comes naturally in the more extensive fauna. 

 I think it is doubtful if Xylocopa should not itself be 

 moved nearer the commencement of the Apida, but 

 I have thought better to adopt the position usually 

 assigned to it by continental writers. 



1. Ceratina cyanea, Kirb. (PL XL, figs. 5 — 5 a). 



Kirb., Mon. Ap. AngL, iL, p. 308, pi. 17, 7 and 8 ; 

 Smith, Cat. Brit. Hym., 2nd ed., p. 180. 



Small, blue, shinmg, almost glabrous, punctured ; ^ with the 

 clypeus and labrum white ; apical segment of the abdomen cari- 

 nated in the 2 • 



$ . Head blue, closely punctm-ed ; antennae black or pitchy, 

 clypeus and labrum white. Thorax shining, of a less bright blue 

 than the head, more remotely punctured ; wings with a brownish 

 tinge ; metathorax finely rugose at the base. Abdomen closely 

 punctured ; 6th segment carinated down the middle at the apex ; 

 7th segment inflected, its apex bidentate ; ventral segments one to 

 six visible ; 6th and 7th apparently soldered together, the apex 

 bidentate ; 8th nearly entirely membranous, with a narrow apical 

 chitinous band (for genitalia see PI. XI., figs. 5 — 5 a). Legs pitchy 

 black ; the extreme base of the tibiae with a white spot. 



