92 HYMENOPTERA. 



smootli depression. The mandibles black. Thorax shining 

 and finely punctured ; the mesothorax with three abbre- 

 viated raised lines in front, the central one longest ; the 

 metathorax smooth and shining, with an enclosed subcordi- 

 form space at its base, and a deep central longitudinal inci- 

 sure ; the wings hyaline and iridescent, with their extreme 

 base yellow ; the exterior margin of the tegulce testaceous, 

 the stigma black ; the anterior and intermediate tibiae in 

 front, and the base of the posterior pair, pale yellow ; the 

 basal joint of the intermediate and posterior tarsi pale, w^ith 

 the apex black ; the claw-joint rufo-testaceous ; the spines 

 at the apex of the tibiae black. Abdomen clavate, with the 

 tip of the apical segment ferruginous and sprinkled with 

 silvery setae. 



Length 3 lines. 



This is one of the rarest species of the British Crahronidce ; 

 the female is described for the first time from a British 

 specimen ; it was unknown until the last season, when 

 my son Edward took both sexes at Shirlet, Sui-rey. I have 

 thought a careful description of the unique example desirable; 

 it is now in the Collection of W. H. L. Walcott, Esq., of 

 Clifton, Bristol. 



ANDRENID^. 



Halictus prasinus. — This hitherto rare species occurred 

 in some numbers at Bournemouth in August last, the locahty 

 where Mr. Dale first discovered it; the male was taken for 

 the first time. The female is fully described in the " Mo- 

 nograph of the British Bees." It is readily distinguished 

 from all the other species of Halictus by its having the head 

 and thorax of an opake dark olive-green ; its abdomen black, 

 with a cinereous fascia at the base of the second and third 

 segments, the apical margin of the latter and the whole of 



