220 BRITISH ICHNEUMONS. \Pezomachus. 



Rufo-testaceous, with the head sometimes darker than the thorax. 

 Abdomen with the two or three basal segments paler than remainder, 

 which are often piceous. Legs uniform testaceous, with only the apical 

 tarsal joint usually darker. 



cJ. Head sub-globose and much broader than the thorax. Antennae 

 slender and somewhat longer than the body \ basal flagellar joint five 

 times longer than broad and somewhat longer than the second, the 

 remainder decreasing in length with none (juite quadrate. Thorax narrow 

 and about a third longer than high ; notauli wanting ; metanotum slightly 

 longer than the petiolar area, the basal costa of which is distinct ; areola 

 wanting, mesosternum saccate, epicnemia slender. Abdomen about as 

 broad as thorax ; basal segment somewhat elongate, gradually explanate to 

 the si)iracles and thence parallel-sided, with the post-petiole not quite half 

 longer than broad ; second segment a third longer than broad ; the 

 remainder transverse, the fourth the widest. Wings vary from normally 

 developed to more or less abbreviated, though never wanting ; the neura- 

 tion towards the apex imperfect ; stigma large though not broad, emitting 

 the radius from its centre ; nervellus opposite. 



Head black, with base of antennae more or less red or piceous. Thorax 

 pale piceous, with the pronotum sub-testaceous ; abdomen black, with the 

 first two, and greater part of the third, segments ochraceous or rufescent. 

 Legs of the same colour, as also are the stigma and nervures. Length, 

 2-5 mm. 



The more or less essential 9 varieties, which have been described as 

 good species, may be briefly referred to as follows : — • 



i. Abdomitial puncturation more diffuse apicaUy ; tcrebra longer. 



RUFULUS. Head not darker than thorax ; meso- longer than nieta-thorax ; 

 petiolar area slightly oblique with its basal costa sharp ; petiolar spiracles 

 not prominent, basal segment apically of normal width ; two basal segments 

 flavous, rest darker. Length, 1-2 lines. 



LUTESCENS. Head darker than thorax ; meso- and meta-thorax of equal 

 length ; petiolar area oblique, its basal costa sharp ; basal segment apically 

 narrow ; the third and fourth segments piceous, with lighter apical margins. 

 Length, ij lines. 



EMARCIDUS. Head not darker than the thorax ; meso- shorter than meta- 

 thorax ; petiolar area vertical, with its basal costa weak : basal segment 

 normally broad apically ; two basal segments with base of the third lighter. 

 Length, | line. 



JUVENILIS. Head darker than thorax ; antennae elongate stout ; meso- 

 and meta-thorax of equal length ; petiolar area oblique, with its basal costa 

 strong ; basal segment apically narrow ; segments three and four piceous. 

 Length, i line. 



DEBiLis. Head darker than thorax ; antennae elongate ; meso- and meta- 

 thorax of equal length ; petiolar area low and nearly vertical, its basal costa 

 strong ; basal segment apically narrow ; basal segment entirely and the 

 second basally flavous, rest castaneous. Length, | line. 



