98 NOTES ON ACULEATE HYMENOPTERA. 



sub-marginal and second discoidal cells, in P. notatus, forms 

 a slightly bent arch ; in P. exaltatus that portion of the 

 nervure forms a double arch ; or, one across the base of each 

 cell. It is quite probable that P. notatus exists in British 

 collections, mixed with P. exaltatus. The above character 

 will serve to separate them. 



Ammophiia lutaria. This rare or very local species is to 

 be met with at Deal. I captured both sexes there last Sep- 

 tember. 



Astata stigma. In the year 1846 I captured a single spe- 

 cimen of the female of this species ; since that time I was 

 unable to discover a second example; last September, I 

 took another female at Deal. August is the month, during 

 which our other British species is usually to be found — 

 the Astata boops. In all probability A. stigma will be 

 captured at Deal during that month in some ensuing season ; 

 the spot where the first example was found at Weybridge is 

 now a plantation of fir trees. 



Oxybelus ferox. I received some specimens of Oxybelus 

 mucronatus from France. The O. ferox, Shuck., proves to 

 be the male of that species, with which the 0. argentatus, of 

 Curtis, is also synonymous; this not only appears evident 

 on a comparison of specimens, but the detailed and accurate 

 descriptions of Dahlbom and Wesmael confirm it. 



Crabro lituratus, Panz. I took a specimen of this species 

 at Deal, last September, also one of Crabro sex-cinctus, 

 Fabr. ; the former is a female, the latter a male ; I have 

 hitherto regarded the C. sex-cinctus as a variety of the male 

 of C. cephalotes; and in a Catalogue, published in 1851, I 

 reduced C. cephalotes to a synonyme; my recent captures 

 induce me to consider this an error; indeed I am further 

 led to adopt this opinion, having since that period received 

 M. WesmaePs valuable Essay from the author, in which he 

 indicates my present opinion. 



