British Hymenoptera. 181 



Penzance, Yorkshire, &c. ; not generally common. F. 

 Smith says that it is a parasite of Andrena lahialis. 

 It occurs from May to August. 



16. Nomada Roberjeotiana, Panz. (PI. VI., figs. 1 — 1 h). 



Panz., Faun. Germ., 72, 18—19; Smith, Cat. Brit. 

 Hym., 2nd ed., p. 124. 



Head and thorax smooth, clearly punctured ; metathorax with 

 the sides below the basal area bright and shining. Abdomen bright 

 ferruginous, much suffused with black, especially towards the apex ; 

 2nd and 3rd segments with yellowish white lateral spots ; 4th and 

 5th in the J^ with indications of bands ; 5th in the $ with a 

 quadrate spot. 



S . Head and thorax very slightly shining, black, sparingly 

 clothed with short greyish hairs, the intervals between the punc- 

 tm'es wider than the punctures themselves, especially on the disk 

 of the latter ; mandibles, except the extreme piceous apex, labruni, 

 clypeus, and face at the sides below the antennae, fiavous ; clypeus 

 densely clothed with erect hairs. Antennae with scape in front 

 flavous ; flagellum rufescent, with an obscure line along its back ; 

 1st joint unusually large and visible ; 2nd and Srdsubequal. Thorax 

 with two spots on the collar, the tubercles and the tegulae flavous ; 

 wings slightly smoky ; 1st transverse median nervure uniting with 

 the cubital before the base of the furcature ; scutellum scarcely 

 raised, ferruginous ; metathorax with the basal area dull, finely 

 rugose, its sides beyond it polished and remotely punctvu-ed. Abdo- 

 men shining, distinctly punctured ; 1st segment black at the base, 

 ferruginous at the apex ; 2nd ferruginous, the sides narrowly black 

 at the base, and each with an oval yellowish white spot ; 3rd widely 

 black at the base, with a pale lateral oval spot ; 4th, 5th, and 6th 

 only ferruginous at the apex, and with irregular pale basal bands ; 

 7th segment somewhat truncate at the apex ; beneath with the 

 basal segments ferruginous ; the apical segments black ; 2nd and 

 3rd often with a yellow spot on each side ; 6th segment densely 

 clothed with somewhat curled pale hairs ; 8th with the apical 

 process very short and broad, widely rounded at the apex, fringed 

 with pale fine spines at the sides, and a long thick piceous spine at 

 each side of the apex (for genitalia see PI. VI., figs. 1 — 16). Legs : 

 femora black at the base, tibiae and tarsi ferruginous, the posterior 

 tibiae clouded across the middle. 



5 . Very like the S' > but with the mandibles and labrum ferru- 

 ginous, the clypeus black, with the extreme apical margin ferru- 

 ginous. Antennae entirely ferruginous, darker above ; collar, 

 tubercles, and tegulae of thorax ferruginous ; wings as in the ^ 



