THE HYMENOPTEEA OF StIFFOLK. 89 



had a very black upper margin (to 2ncl nervure, i.e., to 2nd branch of 

 sub-costal nervure), extendmg to the outer margin; those of P. aryus 

 are only dark to the first branch. The dark margin itself is most pro- 

 nounced in P. aeyon and the fringes of all the wings are whiter (in P. 

 arcjns the fringes appear to be quite dull grey compared with the white 

 fringes of P. aegon). In P. artjus the margin is represented rather as 

 interneural spots. On the undersides the ground colour of P. aegon is 

 bright silvery-grey with bright blue bases to all the wings ; in P. argus 

 the ground colour is dull grey (almost with a tinge of ochreous) and 

 the base of the forewings is only slightly, of the hindwings more 

 strongly, sprinkled with greenish-blue. The angulated row of spots 

 on the underside of the forewings of P. aegon are larger, more con- 

 spicuously and more strongly ringed with white, whilst the direction 

 is different, there being a much stronger angulation in P. aegon 

 centrally. The discoidal spot is much nearer this row in P. aegon. On 

 the hindwings again the black spots are more conspicuous, compara- 

 tively large, and more strongly ringed with white. The marginal 

 orange spots are red-orange in P. aegon and yellow in P. argus. The 

 metallic scales in these marginal orange (yellow) spots are much 

 brighter and of a more brilliant blue in P. aegon than in P. argus 

 where they are greenish. Under a hand-lens the palpi appear to be 

 different. Those of P. argus have a black, pointed, terminal spine, 

 those of P. aegon are rather more slender, black, with a white terminal 

 point. The eyes of P. aegon are surrounded with blue-white scales, 

 those of P. argus with white scales without any blue. The tips of the 

 antennte show a marked peculiarity, those of P. aegon being strongly 

 marked with brown beneath, the long black antennal segments and 

 white intersegmental rings also appear to be much more sharply 

 marked in P. aego7i than in P. argus. I do not wish it to be under- 

 stood that these differences will hold in all individual specimens or for 

 all the races of these insects — I have many P. aegon in which the 

 marginal borders are ill-developed, and others in which the spots are 

 comparatively small — but these certainly appear to be the marked 

 differences in the two species where they occupy practically the same 

 ground at Simplon. 



The Hymenoptera of Suffolk". 



By F. W. C. SLADEN. 

 Among hymenopterists a list of the ants, wasps and bees of Kirby's 

 county is not merely of local but of national and even world-wide 

 interest, especially when, as in the case of the little work under con- 

 sideration, it is well and carefully got up by such an able and thorough 

 entomologist as Mr. Claude Morley, the author of " The Coleoptera of 

 Suffolk," a book uniform with the above. Since Kirby's time various 

 parts of the county have been well worked by many good hymen- 

 opterists, and the list that Mr. Morley has been able to present is a full 

 one, doing great credit to the county and its collectors. The collector's 

 name and the locality and circumstances of capture in the collector's 

 own words are given with each species. An excellent accompaniment 

 to this list is a good map of the county, showing at a glance the 



* The Hymenoptera of Suffolk. Part I. Aculeata. By Claude Morley, F.E.S., 

 &c. [Plymouth ; J, H. Keys, 2/6.] 



