British Hymenoptera. 249 



readily separate it from that species, as well as the 

 position of the recurrent nervure in the 2nd submarginal 

 cell, which in nigrocenea is received, nearly in the 

 middle. 



16. Andrena nigrocenea, Kirby. 



Kirby, Mon. Ap. Angl. ii., p. 109 ; Smith, Cat. 

 Brit. Hym., 2nd ed., p. 45. Stylopised ^ = aprilina, 

 Smith. 



Black, densely clothed with brown hairs. Face in <? 

 with long brown hairs, or black hairs mixed with brown. 

 Antennae reaching to the post-scutellum. Abdomen 

 shining ; genitaha small ; apical ventral valve entire ; 

 ? , abdomen densely clothed with short hairs ; apical 

 fimbria black ; dorsal valve flat, punctured ; scopse 

 bright fulvous ; tarsi with black-brown hairs. Wings 

 clear, with testaceous nervures. 



3' . Face densely clothed with black and brown 

 hairs mixed, or brown in the centre surrounded with 

 black ; above the antennae, between the eyes, longitudi- 

 nally rugose. Antennae reaching to the post-scutellum, 

 its joints subarcuate ; cheeks simple. Mesothorax, when 

 seen through the dense brown hairs that clothe it, 

 rugosely but not deeply punctured; metathorax finely 

 rugose ; basal area finely rugose throughout. Abdomen 

 subovate, shining, finely punctured, and clothed densely 

 on the first four segments with brown hairs, on the last 

 three with black ; apical margins of the 2nd and following 

 segments shining and polished ; beneath with the seg- 

 ments densely fringed with long hairs, apical valve 

 truncate, entire ; genitalia small. Legs clothed with 

 fulvous-brown hairs. 



? . Pubescence of head and thorax as in the ^ , 

 although that on the thorax is generally rather of a 

 richer colour. Abdomen finely and closely punctured, 

 and densely clothed with ochreous-brown hairs, often 

 more or less fulvous on the first four segments, the 

 pubescence at the apex of each segment rather paler ; 

 5th and 6th segments clothed with black hairs ; apical 

 dorsal valve simple and punctured ; beneath with the 

 segments glabrous on their basal half, punctured and 

 densely clothed with fulvous hairs on their apical half, 

 and with a long apical fringe ; anterior and intermediate 

 legs clothed with brown hairs, posterior femora and 



TKANS. ENT. SOC. 1882. PAKT II. (jULY.) 2 K 



