278 Mr. E. Saunders' Synopsis of 



entire apical band of silvery hairs ; 5tli and 6t}i seg- 

 ments clothed with golden brown hairs ; apical dorsal 

 valve triangularly raised in the centre and punctured, 

 its margins slightly reflexed, smooth, and shining ; be- 

 neath clothed with grey hairs. Legs black, clothed with 

 grey hairs ; scopse silvery grey, with a more or less 

 brownish tint ; tarsi piceous at the apex. Length 5| — 

 7 mm. 



Hah. Common and generally distributed. Occurs as 

 an early spring bee in April, and again in July and 

 August. 



Many authors have separated the spring and autumn 

 forms as two species. The characters, however, are so 

 slight that I think it is far more probable that they are 

 only forms of one which is double-brooded. 



In the spring form {parvula) the ^ has the face 

 densely clothed with black hairs, and the ? has the 

 antennae black, and the 1st segment of the abdomen 

 slightly more rounded at the sides. In the summer form 

 {minutida) the <? has the face with shorter grey hairs, 

 and the $ has the antennae slightly piceous beneath, and 

 the 1st segment of the abdomen slightly less rounded at 

 the sides. 



45. Andrena nana, Kirby. 



Kirby, Mon. Ap. Angl., ii., p. 161 ; Smith, Cat. Brit. 

 Hym., 2nd ed., p. 67. 



This species is exactly like the preceding in size and 

 colour, and may easily be mistaken for it ; the following 

 characters will, however, distinguish it : — 



In the (? the antennae are rather longer, the mesothorax 

 is rather less closely punctured, the abdomen is finely 

 rugulose and also distinctly punctured, and the outer 

 forceps of the genitalia are wider at the aj)ex. 



In the $ the mesothorax is slightly less rugulose, the 

 abdomen punctured as in the c? , and the white pubescence 

 denser, forming more distinct bands. Length 5^ — 

 7 mm. 



Hah. Common and generally distributed. Occurs in 

 May, June, and July. 



