156 BRITISH ICHNEUMONS. [ Mesoletus 

colour and structure, but distinct in the colouration of the coxae and 
abdomen, the hamate humeral marks, the anteriorly pale-marked meso- 
sternum of both sexes, and the colouration of the ¢ abdomen. Probably 
little more than a variety of the last species; it was thought by Holmgren 
in 1876 to have been incorrectly referred to the present genus. 
Holmgren originally described both sexes with pale face from Kinne- 
kulle in West Gothland; in 1876 he thought it erroneously placed in this 
genus, though it is difficult to tell to which other of his it could be 
referred; in 1895 Thomson leaves it in J/eso/evus, retaining the pale-faced 
sexes differing only in the black 9@ vitta, and gives PalsjO as locality. 
Our females have the mouth and clypeus pale but the face black, yet 1 
have no doubt they belong to the same species which appears variable in 
puncturation, size and extent of the black abdominal markings but always 
specifically characteristic in the elongate antennae, thorax and abdomen 
with its fairly constant black lateral markings which doubtless caused 
Marshall to refer the specimens he took at Govilon and Cornworthy to 
Tryphon lateralis, Grav. It was introduced with some hesitation by Bridg- 
man (Trans. Ent. Soc. 1882, p. 156) on account of the central intercep- 
tion of the nervellus and I have a black-faced 9, sent by Bignell from 
Devon, so named with a query by him. All the indigenous examples have 
the nervellus centrally intercepted, so that perhaps his query should be 
perpetuated in our fauna; but I do not find the @, named by him from 
Shere, in Capron’s collection. Bignell, however, recorded on Bridgman’s 
authority with no hesitation this species from Bickleigh on zoth August 
and I have seen twenty examples. ‘Three of these were unnamed in 
Desvignes’ collection, others taken by Dalglish at Gourock in June, 1899, 
by Tomlin at Cannock Chase in June, 1904, by Beaumont at Courten in 
Ireland early in September, 1893, by Piffard at Felden and the remainder 
have fallen to my own net, always in the most swampy situations and 
usually among reeds, over which I have seen this parasite flying with 
evident interest in the insects frequenting them, and it is occasionally on 
the flower tables of Angelica. Like AZ. armillatorius, there seem to be two 
emergences from 14th to 27th June and from gth to 25th September, 
during which two months alone | have seen it at Pakenham Fen, Foxhall, 
Henstead and on the banks of the Waveney at Beccles, of the Little Ouse 
at Brandon, of the Gipping at Ipswich and of the Lark at Mildenhall ; it 
also occurs at Matley Bog in the New Forest. 
23. aulicus, Grav. 
Tryphon aulicus, Gr. I. E. ii. 173; Ste. Ill. M. vii. 239; Fonsc. Ann. Soc. Fr. 
1849, p. 220, excl. ¢. T. armillatorius, var. 3, Gr. I. E. ii. 184, ¢. Mesoleius 
aulicus, Holmgr. Sv. Ak. Handl. 1855, p. 134; Joc. cit. 1876, p.9; Voll. Pinac. 
xxiii, fig. 2; Thoms. O. E. xix. 2058, ¢ ¢. Var. M. dubius, Holmgr. Sv. Ak. 
Handl. 1855, p. 134 (mec 1876), ?. 
Head black with the mouth, clypeus and ¢ face flavidous; clypeus 
apically emarginate, more strongly sinuate in g. Antennae with the 
scape flavidous beneath. Thorax black with pronotal margin, and @ 
sternum and callosities before radix, flavidous ; mesopleurae alutaceous 
and very finely punctate, with speculum always quite dull; areola feebly 
indicated or entirely wanting; petiolar area laterally strong. Scutellum 
apically or entirely flavidous, apically red or black throughout. Abdomen 
of @ with segmental margins above, of ¢ with the segments more or 
