APID.'E. 371 



L. 12-14 mm. 



This specie3 is common and generally distributed ; it is a 

 surface builder. In this country it varies but little, and is 

 therefore easily recognized, but on the Continent there 

 exists a variety named nigrescens by Professor Perez, 

 which can scarcely be distinguished from Dcr/iainellus. 

 The (J might be confounded with pomorum, but its 

 shorter face, the black band on the third abdominal seg- 

 ment, and the utterly dissimilar armature, will distinguish 

 it at once. 



B. Derhamellus, Eirb. {Uaiellus, Kirh.). — Hardly dis- 

 tinguishable from the preceding in form, although the S 

 may be known by the fifth joint of the antennae not being 

 quite so long as the third and fourth together, and by the 

 short truncate process of the lacinia being much narrower, 

 and the long basal and spine-like one shorter and blunter 

 and more directed forwards ; the inferior margin of the 

 lacinia also is less hairy. In the colour of the pubescence 

 both sexes are widely different from sylvarum as it occurs 

 in this country. 



cj head clothed with black hairs, sometimes intermixed 

 with pale ones on the face, thorax entirely clothed with black 

 hairs or with a wide band of pale hairs in front and behind ; 

 abdomen with the first, second, and base of the third 

 segment clothed with black hairs, the rest with red, or with 

 the first and second segments clothed with pale hairs, the 

 base of the third with black, and the rest with red, or 

 with the basal segment clothed with black, and all the 

 others with red hairs; between these varieties many 

 intermediate ones occur ; legs with red hairs. 



? and 5 very little subject to variation ; head and thorax 

 clothed with black hairs, abdomen with black on the first, 

 second, and third segments, and with bright red on the 

 rest, in rare cases the red extends nearly to the base of the 

 abdomen. I have two workers of this variety which at first 

 sight I thought might be referable to pomorum, but the 

 B b 2 



