Mesochorus'] BRITISH ICHNEUMONS. 317 



centre ; radius apically a little rellexed ; basal nervure continuous. 

 Length, 3-5 mm. 



The onl}- species with the wliole head black, and legs unusually nigres- 

 cent. 



A scarce species in north and central Europe ; originally bred from 

 P/iv/oiioniiis poljgoni mVx:w6<.Vc\. Introduced as British (Trans. Knt. Soc. 

 188 1, p. 162) on a Scottish specimen and taken at Lakenham in Norfolk 

 during June (Bridg.) ; Bickleigh in Devon in the middle of July (Bignell); 

 and bred from Ilypcra variabilis^ through Liinnciia lugiibrina, by E. A. 

 Butler (Entom. 1883, p. 67). I possess a nice series, comprising both 

 sexes, in Dr. Capron's collection, presumably from Shcrc in Surrey. 



3. tetricus, Holiugr. 



Mesochorus tetricus, Holmgr. Sv. Ak. Handl. 1858, p. 122; Thorns. Ann. Soc. 

 Fr. 1885, p. 334. <J ? . (?) M. basalis, Curt. Brit. Ent. 464 (ncc Cress.). 



Black with tlie legs and c-entre of abdomen rufescent ; terebra almost 

 longer than petiole. Head posteriorly constricted with all tlu' orbits 

 distinctly though not broadly rufescent ; cheeks not strongly compressed, 

 mouth pale; face flavidous, transverse and punctate, of V centrally in- 

 fuscate. Antennae somewhat elongate, with flagellar joints pale and a 

 little discreted. Thorax stout and black with prothorax centrally and 

 mesonotum, except three discal vittae, red; mesopleurae smooth; meta- 

 thorax apically subtruncate, with complete upper areae ; petiolar area 

 large with its centre much longer than its sides, extending very nearly to 

 metathoracic centre; areola large and broad, a little longer than broad 

 and emitting costulae from its centre. .Scutellum red. Abdomen not 

 longer than head and thorax, black with apex of second segment flavous 

 and the following sometiaies obsoletely pale-marked ; second and third 

 segments transverse, and terebra a little longer than the first. Legs 

 rufescent flavous, with the hind coxae and apices of their tibiae somewhat 

 broadly nigrescent ; claws distinctly pectinate. Wings hyaline with 

 tegulae whitish ; stigma broad and black, basally white-marked and 

 emitting the apically hardly curved radius almost from its apical third ; 

 ba.sal nervure continuous ; areolet emitting recurrent nervure slightly 

 before its centre. Length, 6 mm. 



This is our only species, with pale mouth and simple scutellum, that 

 has the petiolar area reaching centre of metathorax. 



Sweden and central Europe. The first r)ritish example was brt-d near 

 London frcjm galls of Cjiiips KolLiri (ImuIi, Enlnni. iSSo, p. 250); bred 

 early in .\ugust from Yorks XotodonLi dronudanus through ApotiUds oclo- 

 nnriiis Irom Rev. C. D. Ash (l^ignell, Devon List li E..M..AL 1897, p. 257). 

 I possess half-a-dozen females of the latter breeding and consider them 

 correctly named, though the colouration is throughout much paler than 

 usually described ; the head, mesothorax except its discal vittae, base and 

 centre of the castaneous abdomen and whole of legs, are pale testaceous, 

 the posterior tibiae and tarsi whitish with apices only of himl tibiae 

 castaneous, and the recurrent nervure emitted somewhat distinctly belore 

 centre of areolet. They are certainly referable to M. bds.i/is. Curl., which 

 seems to differ from the present species in nothing but perhaps having 

 the antennae shorter and paler, and hind coxae i-xternally subinluscale ; 

 it was described from the New Forest, where it was found on tree stumps 



