226 BRITISH ICHNEUMONS. \Pezomachus. 



and meta-thorax equal ; petiolar area slightly oblique, its basal costa weak, 

 not prominent below. Alxlomen diffusely punctured and pubescent, only 

 slightly closer on the three basal segments, first segment with slightly pro- 

 jecting spiracles, evenly explanate from its base to the narrow apex ; terebra 

 as long as first segment. 



Head black-brown ; antennae red-yellow, slightly darker from middle. 

 Thorax dull red-yellow. Abdomen with first segment red-yellow ; second 

 brownish with sides lighter ; three to five black-brown ; six to seven pale 

 pitch-brown ; sheaths of terebra brown. Legs red-yellow, femora and last 

 tarsal joint slightly brownish. Length, i line. 



This species is distinguished from P. pnerilis by the longer first joint 

 of flagellum, uniformly red-yellow thorax, weaker prominences of the 

 metathoracic ridge and paler apex of tarsi. I have no hesitation in 

 synonymizing it with P. immatiirtis, which is described as differing only 

 slightly in colour, the head being rufescent with flavidous palpi, the 

 antennae not apically infuscate and the abdomen fulvous, with segments 

 three to five rather darker. 



In introducing the form immaiiiri/s into our fauna as a good species, 

 Bridgman says (Trans. Ent. Soc. 1886, p. 342), " I have seen a female 

 which agrees exactly with the above insect, taken at Headley." The 

 typical form has occurred at Hastings in Sussex (Vict. Hist.) ; one taken 

 at Taynuilt on loth September, 1894 (Beaumont). 



45. brevis, Bridg. 



Pezomachus hrevis, Bridg. Trans. Ent. Soc. Lond. 1S83, p. 162, 9. 



Head transverse, much wider than thorax. Antennae with second joint 

 of flagellum a little longer than first, which is two -and-a- half times as 

 long as broad, fifth rather longer than wide. Thorax very short, much 

 higher than long ; meso- and meta-thorax about equal in length and very 

 short ; petiolar area long, flat and oblique, its basal costa wanting. Ab- 

 domen ovate ; spiracles on first segment scarcely projecting ; post-petiole 

 broad ; pubescence scattered ; terebra not quite as long as the first 

 segment. 



Black, mouth red ; antennae with joints one to three reddish brown, 

 the rest brown. Abdomen with incisions of the anterior segments slightly 

 pale ; sixth segment is entirely pale. Legs brownish red ; front and 

 middle femora darker towards the base ; hind femora and apex of hind 

 tibiae below, reddish brown. Length, 4 mm. 



The remarkable conformation of the thorax, of which the petiolar area 

 is nearly thrice longer than metanotum, is most distinctive. 



First taken at Dover by F. P. Pascoe, and subsequently recorded by 

 Bignell from Bickleigh early in August. I possess two females taken by 

 Dr. Capron, probably at Shere in Surrey. 



46. Steveni, Grav. 



Pezomachiis Stevenii, Grav. I. E. ii. 913; Forst. Wiegm. Arch. 1S50, p. 226, ?. 



Head dull ; antennae with first joint of flagellum somewhat longer than 

 second, fifth longer than wide. Meso- and meta-thorax equal in length ; 

 petiolar area oblique, its basal costa entirely wanting above, feeble at sides 

 and only moderately projecting below. Abdomen strongly alutaceous, the 



