328 BRITISH ICHNEUMONS. [iMc.mhorus 



16. crassimanus, Holmgr. 



Mcsoclionis crassiniainis, Holmgr. S\-. Ak. Handl. 1S58, p. 125, ? ; Thorns. 

 Ann. Soc. Ent. France, 1SS5, p 340, <? ? . 



Black with the abdomen towards its apex, and the legs, flavous ; hind 

 tibiae with a basal mark, and their apices more broadly, nigrescent; 

 onvchii dilated. Head distinctly" con.>tricted posteriorly, black with man- 

 dibles except apically, pal])i and apices of cheeks, flavous ; face, outer 

 orbits and sides of frons fulvidous. Antennae somewhat shorter than 

 body, piceoLis, becoming rufescent beneath. Thorax black with pro- 

 thoracic margin and pleural sutures usually rufescent; pleurae centrally 

 glabrous and nitidulous. Scutellum black, of 9 '^'^ry rarely red. Abdo- 

 men a little longer than head and thorax, testaceous with the slightly 

 curyed basal segment entirely, the longer than broad second except at 

 apex, black ; third segment quadrate and usually laterally nigrescent ; 

 terebra a little shorter than basal segment. Legs testaceous, with anterior 

 coxae and trochanters whitish ; hind coxae and femora rufescent, and 

 tibiae pale flavous with both extremities nigrescent ; onychii, especially 

 the front ones, explanate ; claws distinctly pectinate to centre. Wings 

 slightly infumate, with stigma piceous and tegulae whitish ; areolet some- 

 what large, emitting recurrent nervure from its centre ; basal nervure 

 continuous. Length, 6-8 mm. 



This differs from Jl/. dimidialits in its strongly elongate body, testaceous 

 stigma, black and longer terebra, shorter and not buccate cheeks, and in 

 the apically constricted mandibles. It is very like AI. semiruftis but 

 besides the peculiarly incrassate onychii, it is distinguishable by its 

 smaller size and entirely pale face. 



Northern Europe; said by Brischke (Schr. Nat. (les. Danz. i88o, p. 208) 

 to haye been bred in Prussia from Hypiua rostralis. It has long been 

 known as British but the only record discoverable is Bridgman's (Trans. 

 Norf. Nat. Soc. 1894, P-623) from P'aton near Norwich in August. Lyle 

 has bred it in the New Forest hyperparasitically from Ch< i/iiatobia hnnnata 

 through Mi'honis piilihriiornis, ^^''esm. I possess three females from the 

 neighbourhood of Shere in Surrey in Capron's collection and another 

 bred b)' Rev. T. A. Marshall from HyponomeiUa padeUa at Botusfleming 

 in Cornwall. Roman tells us (Ent. Tidskr. igi2, p. 67) that it has also 

 been bred from t4ie last host in South Finland and synonymises it with 

 Mesochonis dimidia/us, Holmgr.; in that case I think Thomson's i\L dimi- 

 diaftis must be distinct. 



17. vittator, Holmgr. 



Tryphon vittator, Zett. I.L. i, 1838, 387, ? . Mcsoclionis vittator, Holmgr. 

 Sv. Ak. Handl. 1858, p. 126; Thorns. Ann. Soc. B>. 1S85, p 340, cT ? . M. briin- 

 ncus, Brisch. Schr. Nat. Ges. Danz. 1880, p. 184, rf' . 



A red species with black markings, hind tibiae basally marked \\\i\\ 

 and apically more broadly nigrescent, and the onychii not dilated. Head 

 testaceous with mandibles except apically, palpi and gcnal apices flavous ; 

 centre of frons, vertex and occiput black ; cheeks not very short. An- 

 tennae as long as, or in J rather longer than, the body; ferrugineous, 

 becoming basally flavidous beneath. I'horax very rarely entirely black, 

 usually with prothorax rufescent ; mesonotum red with three black vittae 

 or black with two red ones ; pleurae and sternum usually mainly red ; 



