186 



BEES OF GREAT BRITAIN, 



Female. Length 4|-5 lines. — Black; the clypeus and face 

 on each side yellow, the clypeus has a broad longitudinal 

 stripe, and the base black ; its anterior margin is minutely den- 

 ticulate ; the mandibles and a lunate spot on the vertex behind 

 the eyes yellow, the former black at their apex ; the face has a 

 thin short flavo-griseous pubescence. Thorax : the disk has 

 a sparing fusco-fcrruginous pubescence, that on the sides and 

 beneath griseous ; the wings fusco-hyaline, the nervures and 

 tegulse black, a minute yellow spot on the latter in front; the 

 tibise have a yellow line above, sometimes interrupted in the 

 middle ; the tarsi densely covered with a short yellowish-white 

 pubescence above, with golden-yellow beneath. Abdomen: 

 each segment has at its lateral margins an ovate yellow macula, 

 those on the fourth and fifth are frequently elongated and 

 transverse, these stripes sometimes interrupted, forming two 

 spots on each side ; the apical segment has the two spots be- 

 neath, the pubescence is dense, pale and glittering. B.M. 



Male. Length 5-8 lines.— Black ; the clypeus, the face on each 

 side, the mandibles, and a spot on the vertex above the eyes, 

 yellow; the clypeus has a trident-shaped black macula at its 

 base, and the mandibles have their tips black ; the face and 

 cheeks have a cinereous pubescence, that on the vertex and on 

 the disk of the thorax is fulvo-ochraceous ; the tegulae in front 

 and behind, and the tubercles behind, yellow ; the wings as in 

 the other sex ; the anterior and intermediate tibiae are yellow 

 at their apex ; the thorax at the sides and beneath, and the fe- 

 mora, have a cinereous pubescence ; the tarsi are densely co- 

 vered and fringed behind with silvery-white pubescence ; the 

 basal joint of the two anterior pairs yellow; sometimes the 

 posterior tibiae have a yellow spot at their base, and occa- 

 sionally at their apex also ; their pubescence silvery, having a 

 golden tinge above. Abdomen variable in its markings, having 

 a lateral ovate spot on the fovxr basal segments, a minute one 

 on the fifth, and two central transverse marks on the fifth and 

 sixth ; the sixth having on each side a stout bent acute tooth, 

 the seventh an obtuse one on each side, and a minute slender 

 one in the middle ; the base has a thin cinereous pubescence, 

 and at its extreme lateral margins a tuft of silvery pubescence ; 

 the following segments have a pale fulvous fringe. B.M. 



/3. The seventh segment has sometimes two large transverse spots, 

 those on the sixth being obsolete. 



y. The apical transverse spot obsolete. 



The variations in the markings to which this insect is subject 







I 



