1904.] 155 



Schnenomyza litorella, $ , St. Mary's, 10/4/04; following the modern view this 

 species has been placed among the AiUhomyidn.', thongh not without grave mis- 

 givings on the point. 



Scatopharja sfercoraria, St. Mary's, 9 and 10/ 1-/04 ; Tresco, 11/1/Ot, very com- 

 mon. Sc. litorea, St. Mary's and Tresco ; ihe commonest Dipleron met with, it 

 occurred in numbers sitting on the roads, on the seaweed, and was a positive 

 nuisance when sweeping in the freshwater marshes. Sc. vilLipes, St. Mary's and 

 Tresco, 4 J , 3 ? , not uncommon, had the species been immediately recognised 

 probably many more specimens would have been obtained ; its favourite haunt is 

 under the seaweed, but it was taken also on rhododendron leaves in the Abbey 

 garden at 'I'resco. Although this species appears in italics in Verrall's list, it has 

 been met with in several localities within the British Isles, e. g., Devonshire, The 

 Shetland Isles, &c. I was lucky enougli to obtain a female " in coitu," and as, 

 accoi'ding to Becker, this sex is unknown, the following note may be of interest : — 



Following the table for the discrimination of the various species of Scatophaga 

 given by Becker [Berl. Ent. Zeit., Bd. xxxix (1894), p. Ifi2], the two sexes of Sc. 

 viUipes must separate at (23) the $ possessing no bristles on the hind tibia, while 

 the $ has eight distinct bristles ; this takes her on to (25) where she comes into 

 contrast with Sc. islandica somewhat as follows : — 



25. Pubescence of the whole body but particularly of the legs and breast sides 



very long and line, hind tibiae with from six to eight bristles 26. 



Pubescence of the body neither remarkably long nor fine, hind tibiae with from 

 six to eleven bristles 27 (this refers only to Sc. litorea). 



26. All femora, tibite of the middle legs, and the bases only of the fore- and hind- 



legs entirely blackish-brown, ground colour of all legs dark reddish-brown, 



hind tibiae with six to eight bristles islandica. 



The femora of the fore-legs only in part blackish-brown, the femora of the 

 middle- and hind-legs, and the other parts of all legs including the tips of 

 the fore-femora, entirely reddish-yellow, hind-tibiae with eight bristles... 



villipes, $ . 



With reference to the above it is to be noted that the female taken at Tresco 

 has a distinct dark ring round all the femora ; further, it is desirable to draw attention 

 to what is apparently an interesting (autumn ?) form of the male, with entirely 

 reddish-yellow legs ; this form occurs in Devonshire, where it has been found during 

 October, the normal form having been taken in the same locality during the previous 

 March. 



l'ej>h>ochlamgsJiavi2}e.<i, St. Ma,rj'B,9j4j04,; I have some doubt about the cor- 

 rect identification of this specimen, it is a Tephrochlamys, and is not rufiventris^ 

 still it does not agree well with Loew's description of T.favipes. 



HydrelUa griseola, St. Mary's, 10/4/04. 



Parydra quadripunctata, St. Mary's, 10/4/04. P. coarctata, St. Mary's, 10/4/04. 

 According to Becker's table, Berl. Ent. Zeit., Bd. xli (1896), p. 208, these three 

 specimens of Parydra belong as above, still I am not satisfied about their specific 

 distinction. 



Borborus nitidus, St. Mary's, 9/1/04, very common. 



Limosina, sp. {limosa ?), probably more than one species of this genus occurred, 

 individuals were to be found in great numbers under seaweed, and on one occasion 

 probably thousands were sitting on the ground in the streets of iiugh Town. 



