1912.] 59 



from some specimens which were in Kowarz's coUectiou. It is larger 

 than any other species known to me, and has the arista conspicuously 

 thick and ending bluntly with its pubescence becoming more dense 

 towards the tip. This is the species referred to by me in this Maga- 

 zine in May, 1905, page 108, as having been taken by Col. Yerbury at 

 Nairn. On July 5th, 1909, a large number of Thryptici occurred near 

 Weybridge, and amongst them were three males of this species. 



51. T. Isetns, u. sp. : Bright green. Smaller than T. divisus, but 

 larger than T. hellns, and distinguished from all other species by the 

 greater curvature of the radial vein ; the radial vein is so much curved 

 that the radial and cubital veins slightly diverge at their ends; 

 discal cross-vein about three times its own length from the wing- 

 margin. Arista long, blunt at the tip, almost equally thick, and not 

 pubescent, with its basal joint enlarged ; third anteunal joint fairly 

 large. Face broad on the upper part, and binght green. Bristles on 

 the vertex and postvertex blackish, and even those on the disc of the 

 thorax darker than usual in this genus ; acrostichal bristles numerous 

 (9-12) and small. Legs black ; all knees obviously orange, tro- 

 chanters obscurely orange, middle tibise obscurely brownish orange, 

 or even brownish yellow, and sometimes the hind tibiae obscurely 

 brownish orange, while occasionally tlie front tibise are brown. Genital 

 lamellae blackish brown. The female may be known by its size, its 

 bkmt arista, and by the curved discal vein. 



This species was in abundance about the margin of a shallow 

 pond at St. George's Hill, Weybridge, on July 5tli, 1909, and I have 

 also I'eceived specimens from the neighbourhood of Porthcawl which 

 were taken by Col. Yerbury in August, 1908. Altogether I have 

 examined 19 males and 8 females of this species. All the species of 

 Thryjdicus mentioned in this paper have distinct male hypopygia, 

 but elaborate microscopical drawings would be necessary to show 



the details. 



(To be continued). 



ON THE HYBOS GR0S8IPES, L., OF THE BRITISH LIST. 

 BY A. Ef. J. CARTER. 



Referring to my note on " Hybos culiciformis, Fab., in Scotland" 

 (E. M. M., 1911, p. 161), I ought, perhaps, to point out that 

 culiciformis, as there recorded, is the species standing in our List as 

 grossipes, L., and that the insect I recorded as grossipes is an addition 

 to our List. I thought at the time that this might be so, as according 



