BEES OF GREAT BRITAIN. 135 



Nomada stigma, Fabr. Syst. Piez. p. 393. 11 ? 

 Nomada ferruginata, Schdff. Germ. Zeits. i. 275. 1. 



Brulle, Explor. Sc. de More'e, in. 346. 764. 



Smith, Zool ii. 600. 14. 



Nyland. Ap. Boreal, p. 183. 13. 

 Nomada pleurosticta, Schdff. Germ. Zeits. i. 276. 2. 



Female. Length 4 lines. Head and thorax black ; the man- 

 dibles and antennae ferruginous, the latter fuscous above ; the 

 labrum has a minute acute tooth in the middle. Thorax : the 

 collar on each side, the tegulae, two spots on the scutellum 

 and the post-scutellum, ferruginous ; the wings subhyaline, and 

 having a dark fuscous cloud on their apical margins ; the legs 

 ferruginous, the femora beneath more or less black towards their 

 base ; the tibiae have a black spot in front near their apex ; the 

 basal joint of the posterior tarsi black ; a short silvery- white 

 pubescence on the sides of the metathorax and beneath. 

 Abdomen ferruginous, the base black ; a black spot at the basal 

 margins of the second and third segments laterally, the fourth 

 and fifth have a black band, the latter usually interrupted, 

 sometimes obsolete ; beneath, having a row of black spots down 

 the middle. B.M. 



Male. Very similar to the other sex, but differs in having a 

 more dense silvery pubescence on the face, the sides of the 

 thorax, and also on the sides of the abdomen, and in having 

 the scutellum black ; two or three of the basal joints of the 

 flagellum are swollen and thicker than the apical joints. B.M. 



This is a very local species, but will usually be found where 

 colonies of Andrena fulvescens are met with, being parasitic on 

 that bee ; it occurs sparingly on Hampstead Heath during the 

 month of June, and at Hawley Green, Hants, in profusion. 



18. Nomada atrata. 



N. tota atra ; abdominis basi ferrugineo obscure notata. 

 Nomada atrata, Smith, Zool. iv. 1568. 



Male. Length 3J lines. Black ; the face has a silvery-white 

 pubescence, the mandibles ferruginous, the flagellum obscure 

 rufo-piceous beneath. Thorax : the tubercles and tegulae, ob- 

 scure ferruginous ; the anterior and intermediate femora towards 

 their apex in front, their tibiae in front, and the posterior pair 

 at their base, ferruginous ; the tarsi ferruginous, stained with 

 fuscous above ; wings subhyaline, their apical margins clouded. 

 Abdomen : the second segment obscurely ferruginous, or only 



