124 BEES OF GREAT BRITAIN. 



Female. Length 4-5 lines. Head and thorax black ; the margin 

 of the clypeus, the labrum, mandibles, and a spot at the vertex 

 of the eyes, ferruginous ; the antennae beneath, the apex of the 

 joints above, and the extreme base and apex of the scape, fer- 

 ruginous; the third joint sometimes entirely so; the labrum 

 has a minute tooth in the middle. Thorax : the tegulae, tuber- 

 cles, and two spots on the scutellum, frequently united, ferru- 

 ginous ; the coxae and femora black, their extreme apex ferru- 

 ginous ; the tibiae and tarsi ferruginous, the anterior tibiae 

 having a black spot behind. Abdomen ferruginous, the base 

 black ; the second segment has a large ovate macula, pointed 

 within, the third a smaller spot, or sometimes a narrow 

 transverse line, the fourth a broader fascia, with a minute spot 

 beyond its termination laterally, and the fifth a quadrate ma- 

 cula, yellow ; the basal segment has usually a minute black dot 

 on each side, its apical margin, as well as those of the three 

 following segments, piceous. B.M. 



Male. Length 4 lines. Head and thorax black, the anterior 

 margin of the clypeus narrowly yellow ; the labrum and mandi- 

 bles yellow, the latter ferruginous at their tips ; the face thinly 

 covered with silvery-white pubescence, the antennae black, the 

 flagellum rufo-testaceous beneath. Thorax thinly covered with 

 a long griseous pubescence ; the wings subhyaline, faintly 

 clouded at their apical margins, the nervures and tegulae rufo- 

 testaceous; legs black, the anterior and intermediate femora 

 above, the tibiae and tarsi, ferruginous ; the anterior and inter- 

 mediate pairs have a black stain behind. Abdomen obscure 

 ferruginous, the base black, sometimes two yellow spots on the 

 basal segment, the second having a broad transverse yellow 

 fascia, usually interrupted ; the four following segments have 

 each a transverse fascia, the two first usually slightly interrupted, 

 but frequently the fasciae are entire ; beneath, obscure rufo-pice- 

 ous ; sometimes the third and fourth segments have an obscure 

 transverse yellow stripe, but are usually immaculate. B.M. 



This species is rarely met with ; it was found on Hampstead 

 Heath some years ago, parasitic on Andrena ClarJcella, and has 

 been once or twice taken since ; the species was discovered near 

 Leominster by Mr. Newman. Since it was described under the 

 name of IV. inquilina, it has been received from Dr. Nylander 

 of Helsingfors, who reports that it is the N. borealis of Zetter- 

 stedt. This insect appears in the beginning of April. 



