British Hymenoptera. 171 



5. Nomada lineola, Panz. (PI. VI., figs. 5 — 5 b). 



Panz., Faun. Germ., 53, 23 ; Smith, Cat. Brit. Hym., 

 2nd ed., p. 129. 



Antennae rufo-testaceous, dark at the base above in the <? , their 

 joints longer than wide; 2nd joint of the flagellum in the ^ not 

 nearly half as long as the 3rd ; in the $ about half as long as the 

 3rd; tegulas, tubercles, and two spots on the scutellum (often 

 absent in the <? ), citron-yellow. Abdomen with interrupted flavous 

 bands. 



(J . Very like the preceding species in colour, except as regards 

 the interruption of the 2nd and 3rd abdominal bands, and, although 

 this character will always serve to distinguish it, the following 

 points of structure can be more safely relied upon : the 2nd joint of 

 the flagellum is much shorter in proportion to the 3rd, and, looked 

 at from beneath, is not nearly half its length ; the apical portion of 

 the 8th abdominal segment is slenderer, and the sides near the 

 apex are armed with finer paler spines (for genitalia, &c., see PI. VI., 

 figs. 5 — 5 b) ; the posterior coxse are less densely hairy, and the tibiae 

 are armed at the apex with fine long spines. 



5 . Differs from that of succincta in the same points of colora- 

 tion as the (J , but it wants the yellow line at the sides of the face 

 so characteristic of o succincta; structurally it may be dis- 

 tinguished at once by the 2nd joint of the flagellum of the antennae 

 being scarcely more than half so long as the 3rd, and by the pos- 

 terior tibiae being armed at the apex outwardly with numerous 

 dark spines, Length, 10 — 13 mm. 



Hob. Generally distributed, and not uncommon in 

 April and May. Parasitic on various spring species of 

 Andrena. 



This species is very variable in the extent of the yellow 

 colour ; sometimes the basal segment of the abdomen is 

 banded with yellow, sometimes with red ; sometimes the 

 bands of the 2nd and 3rd segments are widely inter- 

 rupted, sometimes almost entire ; in fact very little 

 dependence can be placed on the coloration for specific 

 characters ; still, in all its varieties, the species may be 

 recognised without failure by careful observation of the 

 points of structure enumerated above. 



