16 



[Jannary, 



Fig. 4. Egg of Pteronideaoligospilus'Forst. Lines to represent the hairs of the leaf 

 in which it is partially buried. 



Fig. 5. Egg of Pontaiiia piliserra Thorns. Secondary rib slightly pushed back to 

 show position of egg, almost beneath it. 



Fig. 6. Egg of the same species, removed from leaf. 



Fig. 7. Priophorus tener Zadd. Longitudinal section of portion of petiole of rasp- 

 berry, showing position of eggs (a), in outer spongy bark (b), never in 

 central more woody portion (c) ; d, outer surface of petiole, X 6. 



Figs. 8, 9. Two different views of eggs of the same species, extracted from petiole. 

 The outline of 9 is probably correct for newly laid eggs, but may be due to 

 manipulation in removing it. 



Roigate. 



November 1921. 



^ A NEW BEITISH BOMBUS, NIGBESCEN8 (P^EEZ), FEOM SUSSEX. 



BY C. H. MOETIMEE. 



In August last, while collecting in the' Newhaven district, I took a 

 cJ Humble Bee of which, though it appeared to be merely a specimen oi" 

 J], derhamellus, the genitalia were typical of B. sylvarum. I con- 

 cluded, after finding five similar examples near the same spot, that they 

 could only be referred to the black race of B. sylvarum, known on the 

 Continent, but not hitherto in Britain, as nigrescens. This identifica- 

 tion Dr. K. C. L. Perkins has been good enough to confirm for me. 

 The fact of as many as six of these S <S having been taken at one spot, 

 must be considered conclusive of a nest of (or containing) the variety, 

 and precludes, therefore, any possibility of introduction from abroad. 



It is much to be regretted that neither Saunders nor Sladen has 

 given, in their respective works, any structural differences which would 

 enable one to separate the 5 $ ^"d. 9 ? of nigrescens from those of 

 normal derhamellus ; but Perez has given some slight characters for dis- 

 tinguishing them. I took a series of black 9 ? ^'t the spot where 

 nigrescens occurred, but can find nothing structural which would cause 

 nie to consider them anything but normal B. derhamellus. 



Except for slight variation in size, the six J <S which I took of 

 nigrescens agree in all respects with each other. 



'• Lotus," Dorking, Sarrey. 

 Nov. 2Gth, 1921. 



[Mr. Mortimer's discovery of the var. nigrescens of B. sylvarum 

 in this country is unexpected and of great interest. Its extraordinary 

 resemblance to B. derhamellus would, of course, render it liable to be 

 overlooked. I have to thank Mr. Morice for sending me quotations from 

 Perez's original paper, as I do not possess this. The nari-ower face and 



