Pezomachus?^ BRITISH ICHNEUMONS. I97 



distinct, though small. Abdomen only moderately elosely punctate and 

 pubescent ; basal segment not tuberculate, basally narrow but strongly 

 explanate beyond the centre ; terebra scarcely half the length of the basal 

 segment. 



Head, thorax and abdomen uniformly black or black-brown. Antennae 

 piceous, with the apex of the pedicellus and base of flagellum flavous. 

 Legs nigro-fuscous ; trochanters, apices of femora, base of tibiae and the 

 tarsi more or less, pure flavous. The tibiae become gradually darker from 

 the centre to the apex ; the apical tarsal joint and the claws are also 

 darker. Length, ii--2 mm. 



$ . Brachypterous. Head black, with the pali)i and base of mandibles 

 red. Antennae piceous, with the first flagellar joint basally red and 

 hardly longer than the second ; fifth half as long again as broad. Thorax 

 entirely black ; meta- shorter than the meso-thorax ; petiolar area oblique, 

 with no basal costa. Scutellum distinct. Abdomen somewhat closely 

 punctate and pubescent, black ; basal segment with very prominent 

 spiracles ; petiole slightly, post-petiole more strongly explanate, parallel- 

 sided and apically broad. Legs piceous ; trochanters, apices of anterior 

 femora, front tibiae and all the tarsi, fulvous. Both pairs of wings puncti- 

 form and white. Length, 2 mm. 



This female appears to differ from P. quaesitorius, Forst., in the absence 

 of a basal costa in the petiolar area and its shorter metathorax ; and from 

 P. ineptus, Forst., in the presence of the scutellum, broad post-petiole and 

 dark legs. 



Probably very common with us, though overlooked on account of its 

 small size. Found among coarse herbage in Dorsetshire (Pickard-Cam- 

 bridge, Entom. 1881, p. 137). Piffard has taken several at Felden in 

 Herts. ; Evans one at Glenfarg in Perthshire, in September ; and Capron 

 a long series at Shere in Surrey. It has occurred to me at roots of Senecio 

 jacobaea in sandy places at Brandon, and in crag-pits at l^'oxhall in June ; at 

 the roots of Oiwpordon acanthium in a marsh at ^Vherstead in early ALay, 

 and running on the warm shore-sands at Felixstowe and Bawdsey in 

 mid August. Chiity has found it at Huntingfield and Doddington, in 

 Kent, Tubney, Sharsted, Buddon ^Vood, and Lees. P. ocissimiis has 

 not before been noticed in Britain ; I took it beneath herbage on the 

 sandy beach at Southwold in Suffolk, in July, 1900; and consider Nees 

 quite correct in regarding it as the male of the present species. 



The form posthumus appears to be nothing but of slightly less full 

 development, with no distinct scutellum, the abdomen diff'usely punctate 

 and pubescent, the whole insect presenting the exact facies of P.festifians, 

 though uniformly brunneous with the basal segment lighter. I have, 

 moreover, taken it in company with the type form on the sandy ground 

 about Brandon beneath Senecio jacobaea in June; Piffard has found it at 

 Felden near Boxmoor, and Bridgman records it from Mousehold near 

 Norwich. Evans has sent it to me from the Island of St. Kilda. 



16. hieracii, Bridg. 



Pezomachus hieracii, Bridg. Trans. l".nl. Soc. 1883, p. 162, 9 . (?) P. /iiuaris, Forst. 

 Wiegm. Arch. 185 1, p. 45, i . 



9 . Head transverse and somewhat contracted behind the eyes. An- 

 tennae normal ; two basal flagellar joints of about equal length and about 



