1913.] 11 



Cheeks withovit a spine, oiily a little iincven ; face between the antennae with 

 yellow-brown hair tufts A. rosse, Panz. 



3. Abdomen more or less red 4 



Abdomen black, only the apical margin of the segments more or less clear 



testaceous ; cheeks without a spine. 



4. Cheeks spined A. spinigera, K. 



Cheeks not spined A. anglica, n. st. 



All the four races distinguished in this table occur in England. 

 Andrena ti'immerana, K., is one of the commonest of British bees. It 

 is single-brooded always. In North Wiltshire and adjoining parts of 

 Gloucestershire, where I collected for many years, it was the only form 

 that occurred, and even in the hottest summers no second brood was 

 produced, though rarely there was a sparse second generation of its 

 common parasite, Nonmda alternata. 



In Devonshire A. trhnmerana is antedated in its appearance by 

 A. sjiinigera, which may be abroad on any warm day in March, but 

 before the latter has at all passed, the former may be already out, so 

 that the two are often taken in company in my garden. A. anglica in 

 the same localities appears in July, and is the summer generation of 

 A. spinifjera. 



Both A. spinigera and A. trimmerana are frequently stylopized, 

 and some of these parasitized individuals are difficult to assign to their 

 proper species. I have not taken a stylopized example of A. anglica. 



From my study of A. spiiiigera. and its summer generation, 

 A. anglica, I have no doubt that A. rosse is likewise the summer brood 

 of A . teufonica. The latter does not seem to occur in the coastal district 

 of Devonshire in places where spinigera and anglica are common, or at 

 least I have not found it, but it is found inland on Dartmoor (where 

 spinigera is also found), and no doubt a search in this locality would 

 produce A. rosx in the summer. A. anglica and spinigera seem to be 

 commoner in England than rosai and teutonica, but owing to the fact 

 that Saunders did not distinguish all these races the distribution is 

 uncertain. I have not met with true rosie myself, not having had the 

 opportunity to visit in summer the localities where I have taken 

 teidonica in the spring, but Mr. A. H. Hamm, of Oxford, has just sent 

 me a beautiful example of Panzer's insect from near Matley Bog in the 

 New Forest. 



The position then with regard to these insects appears to l^e that 

 there are three distinct races in England : — (I) The single-brooded 

 A. trimmerana, K., the most abundant of all ; (2) A. rosea, Panz., with 



