296 HYMENOPTERA ACULEATA. 



N. borealis, Zett. {iyiquilma, Smith). — Like a very 

 dark ruficornis, and without any very strong structural 

 characters to distinguish it therefrom ; by its colour, how- 

 ever, and the denser, thicker hairs of the legs, it is easily 

 recognizable. Mandibles acute, antennae dark piceous, 

 paler beneath, scape entirely black in both sexes, clypeus 

 with only the margin pale in the S ; thorax with the tuber- 

 cles and tegulse piceous, mesonotum in both sexes without 

 red lines, scutellum obscurely red in the ? , the brown colour 

 of the abdomen darker and more suffused with black, espe- 

 cially in the ? ; legs dark piceous, posterior femora more 

 largely punctured, and clothed on their outer side in the ? 

 with bristly black hairs, densely clothed in the c? with 

 whitish hairs. 



L. 9-11 mm. 



Parasitic on Andrena Clarl-ella, and taken by Mr. Frisby 

 with A. lap'ponica ; usually rare but very widely distributed, 

 and probably to be found wherever A. Clarkella occurs. It 

 is recorded from Ireland and as far north as Newcastle. It 

 also doubtless occurs in Scotland, as A. ClarJiella is not 

 uncommon there. 



N. lateralis, Panz. nee Smith (xanthosficta, Sm., 

 1st ed., Bridijmanniana, Smith). — Very different to the 

 preceding in general colour, but really very closely 

 allied to it, although the females are abundantly 

 distinct. As a rule, however, both sexes are smaller, 

 the c? diflfers further in having the sides of the face 

 flavous, and the hairs below the antennae bright silvery, 

 whereas in borealis they are tinged with brown, the 

 tubercles are margined with flavous, and the abdomen 

 is pale brown black at the extreme base, each segment 

 with a transverse yellow band or wide lateral spots ; 

 femora rather less hairy than in horealis. The $ is 

 abundantly distinct from any other species j like horealis, it 

 has the scape of the antennaj and mesonotum entirely black, 

 except the scutellar spots, but the flagellum of the antounce 



