Pezomachus:\ BRITISH ICHNEUMONS. 205 



$. Winged. Mesosternum saccate ; epicncmia slender ; petiolar area 

 distinct, its basal costa present. U'ings with stigma large hut not hroad, 

 radius emitted from its middle ; parallel nervure from centre of brachial 

 cell ; nervellus opposite. 



Black, with red coxae and legs. Length, 3-4 mm. 



The female differs from P. ma7tdi/>uhiris in having the antennae and 

 their postannellus shorter, petiole broader, legs slender and central abdo- 

 minal segments black ; the male in having the pronotum and abdomen 

 entirely black. This species may be distinguished from P. incuhitor in its 

 more vertical petiolar area, stronger basal costa, diffuse pul)escence of the 

 apical segments, and in having the fourth always more or less piceous or 

 black. 



Bridgman, introducing it as new to Britain, says (Trans, luit. Soc. 1882, 

 p. 148) that this is not an uncommon species in the neighbourhood of 

 Norwich ; Bignell has captured it at Bickleigh and Exeter, in August and 

 September ; I.uff in the Isle of Herm, and Fitch at Maldon in Essex. 

 Both sexes have been bred from Zygaena filipendiilae (Entom. 1883, p. 65). 



26. attentus, Fot-st. 



Pezoniachns bicolor, var 3, i\x. I. E. ii. 903. P. attentus, Fcirst. Wiegm. Arch. 1850, 

 p. 163, 9. P. traiisfiiga, Fiirst. loc. cit. p. 193, 9. P. lepidiis, Fi3rst. lib. cit. 

 p. 220, 9 . 



Antennae with tlie basal flagellar joint scarcely longer than the second ; 

 the fifth longer than broad. Meso- and meta-notum of equal length ; 

 petiolar area oblique, with its basal costa distinct throughout, forming a 

 central high and not wide curve. Scutellum wanting. Abdomen closely 

 punctate and pubescent, sometimes more diffusely towards the apex ; 

 basal segment very slightly explanate to the not prominent spiracles and 

 thence more strongly to the somewhat broad apex ; terebra as long as, or 

 slightly longer than, the basal segment. 



Head black ; antennae red, with the scape piceous, and sometimes the 

 apices infuscate. Thorax red, sometimes with the metapleurae piceous. 

 Abdomen with the two basal segments red, the first sometimes with its 

 sides infuscate, the second occasionally with a nigrescent transverse band ; 

 the remainder black, with their apical margins more or less indeterminately 

 red ; sheaths of terebra piceous. Legs red, with the apical tarsal joint 

 infuscate. Length, 2^-3! mm. 



I have no hesitation in synonymizing the form transfuga with the 

 present species, from which Fbrster separated it on account of the apically 

 not more diffuse abdominal i)uncturation, which, as in some forms of 

 P. carui/ex, has been shown to be an inconstant character. From J\ 

 bicolor, the present species may be known by its longer terebra, and the 

 coloration of the abdominal segments, of which the second is usually 

 immaculate red. /'. lepidus is certainly only a form of P. atlcntiis with 

 the metathoracic costa centrally contracted and the third segment red. 



'J'his si)ecies is somewhat poorly figured in " Knowledge," v. p. 288. 



Common in Norfolk and bred from the nests of A\::;cleiia lahyrinlhica by 

 Marshall (Bridgman); bred in Devonshire from spiders' nests taken out 

 of furze bushes, probably those of A. lahyrinthica (Bignell) ; I-and's l'2nd 

 district (Martjuand) ; occurs in Essex and at Battle in Sussex (Vict. Hist.) ; 



