BEES OF GREAT BRITAIN. 133 



having sometimes a narrow line on each side at its basal margin, 

 yellow ; beneath, immaculate. B.M. 



This little bee is abundant and very widely distributed ; it is 

 parasitic on several species of Halictus, and also upon Colletes. 

 I find it every season with a colony of Halictus morio ; it varies 

 a good deal in the colouring, and has received various names in 

 consequence ; it may be found during the months of April and 

 May. 



15. Nomada mistura. 



N. atra; abdomine rufo-fasciato, maculis sulphureis obscuris 

 notato. 



Mule. Length 3^ lines Black ; the mandibles ferruginous, a 

 spot at their base and the margins of the clypeus yellow ; the 

 labrum has a minute tooth in the centre ; the antennae ferrugi- 

 nous beneath, the three or four apical segments entirely so ; the 

 scape black. Thorax : a spot on each side of the collar and the 

 tubercles yellow ; the apex of the femora, the tibiae and tarsi 

 yellowish ; the anterior and intermediate tibiae have a dark stain 

 above, the posterior pair black, except their base and apex ; the 

 wings subhyaline, their apical margins clouded, the tegulae and 

 nervures ferruginous. Abdomen : the apical margin of the basal 

 segment ferruginous, a band of the same colour across the 

 middle of the following segments ; the second and third have 

 on each side an oblong angulated yellow macula, the third a 

 smaller one at the sides, and the following a transverse yellow 

 stripe ; beneath, having more or less bright ferruginous bands. 



When this species was described, I had only seen the unique 

 specimen which was captured by Mr. Hewitson ; subsequently a 

 second was taken in Yorkshire, and two others were sent for 

 examination by Mr. Heysham, captured near Carlisle ; the female 

 is not at present known. 



16. Nomada Fabriciana. 



N. atra ; antennis runs, nigro annulatis ; abdomine ferrugineo, 

 maculis duabus flavis. Mas, abdomine ferrugineo, maculis 

 quatuor flavis. 



Apis Fabriciana, Linn. Syst. Nat. i. 955. 17 $ . 

 Rossi, Faun. Etrus. Mant. no. 324. 



