British Hymenoptera. 183 



Easily recognised by the blunt tubercle between the 

 antennae, where in the other species there is a sharp 

 carina. 



18. Nomada armata, H.-Sch. 



H.-Sch., Germ. Zeitsch., i., p. 279 ; Smith, Cat. Brit. 

 Hym., 2nd ed., p. 118. 



Large ; labrum black ; anterior femora in the ^ dilated and 

 excavated in front ; labrum of the $ produced into a tooth ante- 

 riorly. Abdomen ferruginous, with yellow lateral spots. 



i . Head and thorax black, densely and rugosely punctured, 

 clothed with grey hairs, the hairs on the face below the antennae 

 silvery white; mandibles ferruginous, flavous at the base and 

 piceous at the apex ; labrum black, with a tooth at the 

 apex ; clypeus black ; sides of the face just above the man- 

 dibles yellow. Antennas with the scape black, the flagellum 

 pale ferruginous, its 2nd joint longer than the 3rd. Thorax black ; 

 tegulffi and tubercles testaceous ; wings with a dark apical border. 

 Abdomen bright ferruginous, the extreme base black ; 2nd, 3rd, 

 and 4th segments each with a spot on each side ; 5th and 6th with 

 an apical dorsal spot ; base of the 5th and 6th segments black ; 7th 

 segment narrow, deeply emarginate at the apex ; beneath ferru- 

 ginous, apex of the segments fringed with silvery hairs at the sides. 

 Legs with the femora black, except at the extreme apex ; tibife and 

 tarsi ferruginous, the basal joint of the posterior tarsi black above ; 

 anterior femora dilated at the base, excavated, and very shining in 

 front. 



$ . Like the $ in general colour, but larger ; mandibles ferru- 

 ginous, pitchy black at the apex ; labrum black, with a well- 

 developed apical tooth ; face clothed with silvery hairs below the 

 antennae, with brownish on the vertex. Antennae ferruginous ; 8th 

 to 11th joints darker ; scape black in front and behind; flagellum 

 with the 2nd joint much longer than 3rd. Thorax clothed with 

 short brown hairs ; collar, tubercles, and tegulae testaceous ; wings 

 clouded, with a distinct apical band, as in the ^ ; mesopleurse with 

 a tuft of silvery hairs ; scutellum red ; post-scutellum with a red 

 line ; metathorax densely clothed at the sides with silvery hairs. 

 Abdomen wider than in the $ , but similarly coloured. Legs ferru- 

 ginous ; femora black at the base and beneath ; posterior tibiae with 

 a black mark within ; posterior metatarsi black ; posterior coxae 

 densely clothed with silvery hairs. Length, 11 — 12 mm. 



Hab. Norwich ; Deal ; Exeter ; Penzance ; Morthoe, 

 N. Devon. Very rare ; parasitic on Andrena Hattorjiana. 



