1906.] 153 



wing, bj the transverse costa3 of the propodeuni ; in this respect it more or less 

 resembles S. affinis. It should be placed next to Salius notatulus, the ? of which 

 to my mind is not very satisfactorily identified. The male of notatulun is so very 

 distinct from its allies, that it is difficult to imagine that the ? should not possess 

 more distinctive characters than those which belong to the few specimens known 

 from this country. It would not surprise me to find that Miss Chawner's females 

 belong to notatulus, and that our other supposed representatives to varieties of the 

 allied species ; but at present there is no evidence to prove this. 



Fassaloecus monilicornis^ Dhlb. 

 The (J of this species is incorrectly defined at page 98. Its chief peculiarity, 

 by which it may be known from any other species of the genus, lies in the form of 

 the antennae. These are slightly incrassated towards the middle, and each joint is 

 widened near the centre posteriorly, so as to give the moniliform character to these 

 organs which the name implies. The white labrum is not a constant character. 

 Most males, if not all, have it pitchy-brown, and there is a variety of the ? with 

 the labrum black, which has been taken by Mr. Evans and Col. Yerbury in 

 Scotland, and by Col. Yerbury in Ireland. The characters which can best be relied 

 upon to determine the species are the form of the antennae in the J , the wider 2nd 

 submarginal cell, the wider and apparently shorter basal segment, and the less basally 

 constricted 2nd segment of the abdomen in both sexes. These latter characters are 

 specially evident in the ? , and give the abdomen a wider and more oval form. It 

 falls into the section with only one ti'ansverse crenature on the mesopleurse, and can 

 easily be distinguished from gracilis, the only other species in that section, by the 

 characters given above and by the white tubercles of the "^ . 



Psen, Latr, = Mimesa, Auct. 



F. F. Kohl, Die G-attungen der Sphegiden (Anu. K. K. Naturh. 

 Hofm , xi, p. 289), points out that Latreille's genus was clearly founded 

 on what we call Mimesa atra, Fab., as he specially mentions the peculiar 

 form of the anteunsB in the ,^ . This being so, priority requires us 

 to follow him in changing the name of our genus Mimesa to that 

 of £sen. 



Psenuhcs, Kohl. 



In consequence of the above change, Herr Kohl has given a new 

 generic name to those species formerly placed under Psen. 



Psenulus concolo)% Dahlb. (Ent. Mo. Mag., xxxiii, p. 252). 



This species is larger than palUpes, and may be easily known by the characters 

 pointed out by Mr. Morice {loc. cit.). These lie chiefly in the head ; the vei'tex in 

 both sexes is shining and very finely punctured in concolor, almost dull and coarsely 

 punctured in pallipes. In the ? the sti'ongly marked carina between the antennae 

 divides into two branches below them, but in concolor the branches diverge at an 

 angle of about 90", so as to form a simple Y, and the stem of the Y terminates 



