244 F. W. EDWARDS. 



p. 45, pi. i, 1913) and Pomeroy (U.S. Dept. Agric. Bull. 329, p. 13) also agree almost 

 entirely in structure, coloration and habits with British S. aureum, the only difference 

 being in the shape of the larval antennae, which may depend on the preparation. 



The pupa has also been figured by Garnett (Trans. Manchester Microsc. Soc. 

 1914 [1916], p. 10, pi. i) as that of S. reptans. The adults described by Corti (Atti 

 Soc. Ital. Sci. Nat. liii, p. 192, 1914, and liv, p. 223, 1916) as S. aureum apparently 

 agree with the present interpretation of Fries' species, which is evidently widely 

 distributed in Europe. Dr. G. Enderlein has sent me specimens from the neigh- 

 bourhood of Berlin ; he also had determined them as S. aureum. There is an African 

 representative with a wide distribution in that continent, which has recently been 

 described by Pomeroy as S. aureosimile. 



14. S. subexcisum, Edw. (figs. Im, 2/, 3e, 4o). 



Larva. — General colour pale dingy yellowish-brown. Head pale yellowish, 

 clypeus with sharply defined black marks ; the largest and most conspicuous a 

 wedge-shaped one in the middle near the posterior margin ; a small one anterior to 

 this ; a pair of small ones rather close together one on each side of the anterior end 

 of the wedge-shaped one ; also a transverse black mark at each posterior angle ; 

 a conspicuous dark stripe over the eyes, including a small blackish dot. Antennae 

 blackish, very long, 9-jointed, first joint slightly swollen towards the base, about 

 six times as long as broad, followed by four short joints, each a little longer than 

 broad ; sixth and seventh rather longer, twice as long as broad ; eighth joint very 

 long and slender, as long as the first ; ninth minute. Mentum with 9 teeth in the 

 terminal row, the middle one and the two at each end larger than the remaining four ; 

 sides of mentum with one or two long hairs. A pair of well-developed ventral 

 papillae on the last abdominal segment. Anal sucker with about 80 rows, each with 

 about 10-12 hooks. Skin round anus bare. Gills simple. 



Pupa. — Respiratory filaments long, six in number ; the first division is close 

 to the base, into short stems diverging almost at two right angles ; the upper stem 

 divides into two branches, which continue in a vertical direction as far as the height 

 of the pupa, then bend forwards along the anterior projection of the cocoon ; the 

 lower stem is shorter than the upper, dividing almost immediately into two branches, 

 each of which is forked at some distance from its base. Cocoon as in S. latipes 

 with a long anterior projection. 



Habitat. — Stones and grass-blades in small temporary streams in or near woods, 

 in company with S. latipes, but always comparatively scarce. 



Breeding Season. — The few specimens reared were obtained in the late spring. 

 As in the case of S. latipes, there cannot normally be more than one brood in the year. 



Material collected. — Two males were reared from pupae found on stones in a small 

 rill on Stanmore Common, Middlesex, iv.l916. A single female was reared from a 

 pupa found on a stone in a small stream at Knebworth Wood, Herts., 10. v. 1920, 

 and half a dozen larvae were found at the same time and place on stones and grass- 

 blades. In each case the specimens were associated with large numbers of S. latipes. 



A small number of females were taken at Glen Sannox and Glen Catacol, Arran, 

 v. 1919, flying in company with S. latipes ; also at Gidleigh Park, S. Devon, 2.vi.l920. 



