76 [September, 



division between the yellow and grey segments is sharply defined, by which it differs 

 from C. mollicula, in which the hind segments, -when nigrescent, are only partially 

 and irregularly so. 



I found a single male at Buckingham in Aiigust, 1884, and a single female 

 (■which is a good deal larger than the male) at Conishead Priory, near Ulverston, 

 Lancashire, in August, 1886. 



SCH^NOMYZA, Hal. 



S. LITORELLA, Fall. 

 Mr. W. H. Harris, of Cardiff, sent me a specimen of this little maritime fly in 

 1886, which he had found there. It may at once be known by its generic character 

 of having the first longitudinal veins shortened, so that the internal transverse veins 

 are placed considerably beyond the termination of the auxiliary branches of the first 

 longitudinal vein in the costa. The alulets are so small, that this species might 

 more properly be left among the Acalypteratce, where Meigen placed it in the genus 

 Sciotnyza. 



Bradford: 1887. 



A NEW SPECIES OP ^SCHNA FROM SOUTH AMERICA. 

 BY ROBERT McLACHLAN, F.R.S., &c. 



This belongs to the group of more or less reddish species in 

 which the top of the front is 7iot marked with a spot iu the form of 

 the letter T; a group of small extent. 



^SCHNA PeEEENSI, 11. Sp. 



S ■ Abdomen about 55 mm. Posterior-wing, 51 mm. 



Wings long and rather narrow, sub-acute at apex, hyaline, with a faint yellow 

 tinge at extreme base of posterior ; but the costa, sub-costa, and median nervure as 

 far as the pterostigma, and most of the chief sectors as far as the nodus (together 

 ■with a portion of the basal net^work), are bright red, giving a reddish appear- 

 ance to the basal and costal portion of the wings ; neuration otherwise blackish- 

 brown. 22 — 24 ante-cubital nervules and 11 — 13 post-cubital in anterior--wings ; 

 14 — 15 ante- and post-cubital in posterior. Pterostigma very narrow (5^ mm.), 

 yellow. Furcation of sub-nodal sector short and narrow, commencing belo^w the 

 middle of the pterostigma and enclosing only two rows of cellules. Discoidal 

 triangle with three simple nervules in both pairs. Anal triangle in posterior with 

 only one nervule. Membranule blackish-cinereous, short, not extending to the 

 middle of the anal triangle. 



Head and thorax reddish, with a slight olivaceous tinge, apparently without 

 markings of any kind, but blackish about the ocelli, and the tips of the mandibles 

 and the margin ( ? the whole) of the back of the eyes are black ; thorax with 

 cinereous pilosity above. 



Abdomen somewhat slender, reddish above, dingy beneath ; transverse sutures 

 faintly blackish, but there arc no evident markings in the dried individual, save 



