THE HYMENOPTERA OF SUFFOLK. 39 
had a very black upper margin (to 2nd nervure, @.e., to 2nd branch of 
sub-costal nervure), extending to the outer margin; those of P. argus 
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. 
argus the fringes appear to be quite dull grey compared with the white 
fringes of P. aegon). In P. argus 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 
antenne 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. aegon than in P. argus. Ido 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. aeyon 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 ata glance the 
* The Hymenoptera of Suffolk. PartI. Aculeata. By Claude Morley, F.E.S., 
&c. (Plymouth; J, H. Keys, 2/6.] 
