Pezomachus?[ BRITISH ICHNEUMONS. 23I 



metathoracic ridge being less strong in the middle above, the broader base 

 of the petiole and the shorter terebra. It differs from P. pedUularius in 

 the mesonotum, which is not transverse, in the longer metanotum and 

 mesosternum, more slender antennae and black mesothorax. 



Ratzeburg suggests that this species is parasitic upon Spilocryptus cint- 

 bicis. He records the female as bred from Cimbex variabilis, Lophyrus 

 pifii and Z. nemoniiit, Tortrix piceana and Bombyx pini. Brischke bred 

 it from Orgyia gonostigma, Microgaster cocoons and spiders' nests ; 

 Kirchner gives Psyche graminella as its host ; and Dr. Cha[)man has bred 

 the macropterous male at Lugano from Acan/hopsyche aira, L., in 1905. 

 This species was mentioned as British by Desvignes in 1856, but I do not 

 know it, and the only record I can find is that of Bridgman's male from 

 Felthorpe near Norwich. 



50. detritus, Forsf. 



Pezomaihtts detritus, Fijrst. VViegm. Arch. 1850, p. 196, 9 • 



Antennae with first joint of flagellum a little longer than second ; fifth 

 rather longer than wide. Meso- and meta-thorax of equal length ; petiolar 

 area very slightly oblique, its basal costa very weak above, very sharp at 

 sides. Abdomen excessively diffusely punctured and pubescent, the 

 punctures not visible except under high power ; first segment very slightly 

 expanded to the projecting spiracles, thence more strongly, and its apex 

 somewhat broad ; terebra as long as first segment. 



Head black-brown ; antennae red-brown, apex of first and base of second 

 Joints of flagellum whitish yellow, the apex darker. Thorax dull dark red, 

 sides brownish. Abdomen black-brown, first segment rather lighter. 

 Legs red-yellow ; femora and tibiae except base slightly infuscate ; last 

 tarsal joint not darker. Length, 2 mm. 



Mousehold near Norwich, several females bred from the cocoons of 

 ' Apanteles co?iges(us, which were probably parasitic on Pliisia gamma 

 (Bridgman). 



51. pedicularius, Fab. 



Ichneumon pediiulariiis. Fab. F. S. ii. 192 (nee Panz. ). Pezoinachiis pediciilariits, 

 Clr. I. E. ii. 922; Furst. Wiegm. Arch. 1S50, \>. 199, 9 ; Thorns. O. F. x. 1015, i 9. 



9 . Head narrowed behind the eyes ; genal sulcus narrow but distinct, 

 genal costa strongly inflexed ; clypeus rounded at apex ; mandibles tuber- 

 culate at base. Antennae somewhat slender ; first joint of flagellum longer 

 than second, fifth slightly longer than wide. Mesonotum transverse, yet 

 longer than metanotum ; [jctiolar area rather obli(iue, its basal costa form- 

 ing a high curve, but not very prominent at the sides ; acetabula scarcely 

 extending beyond middle of mesosternum. Abdomen sub-glabrous, finely 

 alutaceous and diffusely pubescent ; first segment without projecting 

 spiracles, gradually widened from base to apex, second and third rugulose, 

 sub-opaque ; terebra as long as first segment. Legs rather stout. 



Head black ; palpi brown ; mandibles red. Antennae red at base, 

 brown at apex ; the apex of fourth joint brownish, and this colour in- 

 creases so that the thirteenth is entirely brown. Pro- and mesothorax 



