140 BRITISH ICHNEUMONS. [ Mesolerus 

(57). 58. Mesonotum not red-marked ; head 
posteriorly buccate a .. 27. SEGMENTATOR, Holmgr. 
(54). 59. Mesopleurae alutaceous throughout, 
somewhat dull above. 
(61). 60. Scutellum red or flavous; notauli 
weak and apically obsolete .. 28. HAEMATODES, Grav. 
(60). 61. Scutellum black; notauli deeply im- 
pressed throughout de .. 29. MACULICOLLIS, Steph. 
(53). 62. Sulcus and carinae of petiole strong 30. STERNOXANTHUS, Grav. 
(52). 63. Apex of clypeus not centrally pro- 
duced and laterally hardly dilated ; 
scutellum red. 
(65). 64. Ventral plica broadly black-marked 31. DUBIUS, Hlolmgr. 
(64). 65. Ventral plica entirely white or 
flavous. 
(67). 66. Second segment apically pale; meso- 
pleura glabrous above... .. 32. FURAX, Holmer. 
(66). 67. Second segment black; mesopleurae 
alutaceous. 
(69). 68. Mesonotum black ; notauli almost 
wanting ca fe 54 2. 33</ OPTICUS, Grae. 
(68). 69. Mesonotum fulvous throughout; no- 
tauli distinct 34. FORMOSUS, Grav. 
(51). 70. Thorax stout; clypeus apically trun- 
cate or subtruncate. 
(76). 71. Petiolar area somewhat distinct ; 
thorax short. 
(75). 72. Notauli very determinate and extend- 
ing to apex. 
(74). 73. Hind tibiae entirely black; scutellum 
pale .. $) bi te .. 35. CANINAE, Bridg. 
(73). 74. Hind tibiae broadly white-banded ; 
scutellum black... i .. 36. FILICORNIS, Holmgr. 
(72). 75. Notauli slender and hardly extending 
to apex fis 43 we .. 37. PYRIFORMIS, RaZz. 
(71). 76. Petiolar area obsolete; thorax elon- 
Raters: He a = .. 38. MULTICOLOR, Grav. 
(50). 77. Clypeus broadly rounded apically; 
body strongly elongate .. .. 39. NIGER, Grav. 
(29). 78. Body glabrous and strongly nitidu- 
lous; abdomen strongly com- 
pressed from centre ;_ length 
5 mm. or less [SAOTUS, Thoms. ]. 
(80). 79. Abdominal incisures not constricted ; 
hind coxae pale... te ee 
(79). 80. Third segment constricted ; hind 
coxae basally black $s .. 41. COMPRESSIUSCULUS, Zh. 
40. RENOVATUS, JZord. 
1. virgultorum, Grav. 
Tryphon virgultorum, Gr. 1. E. ii. 172, 9. Mesoleius Virgultorum, Holmer. 
Sv. Ak. Handl. 1855, p.159; M. virgultorum, l.c. 1876, p.48; M. (Barytarbus) 
Virgultorum, Thoms. O. E. ix. 931; M. [B. (Polytreres)] Virgultorum, Thoms. 
OME axXVile 873.0) S. 
Head hardly constricted posteriorly ; clypeus apically depressed, sub- 
truncate and obsoletely margined ; palpi and a central mandibular mark 
pale testaceous. Antennae black, becoming apically rufescent. Thorax 
shining, stout and anteriorly elevated with a pale testaceous callosity 
