Catalogue of British Ichneumonidce. 341 



perceptible ; posterior surface divided into three arese ; metathorax 

 transverse. Abdomen ovate, about as long as the head and thorax, 

 and a little wider than the latter ; 1st segment slender ; post-petiole 

 very little vsdder than the petiole ; spiracles hardly projecting, 

 placed just behind the middle ; remaining segments transverse ; 

 apex of 2nd the widest ; aculeus about as long as the 1st segment, 

 or between one-fourth and one-third the length of the abdomen. 

 Legs very slender. Wings without areolet ; outer nerviu'e absent ; 

 posterior inferior angle of discoidal cell subacute ; transverse anal 

 nervure not divided. The male scarcely differs from the female ; 

 the antennae are more filiform, and the abdomen rather more 

 cylindrical. 



Black; part of front femora, tibiae, and tarsi, piceous; sometimes 

 hind tibiae show faint indications of darker marks at the apex and 

 before the base, and the 2nd segment of the abdomen is sometimes 

 rather piceous. Tegulx more or less piceous. Stigma fuscous, 

 more or less diluted. 



Male and female ; length, about 2*5 mm. 



Bred by Mr. W. H. B. Fletcher from spiders' nests 

 taken at Worthing, which swarm on the coast. 



This species appears to me to come in Phalanx 2, 

 II. mm. n. of Thomson's divisions in ' Opuscula Entomo- 

 logica,' p. 989. 



Pezomachus hortensis, Gr. ; P. agilis, Thorns. ; P. spinula, 

 Thoms. ; P. mandihularis, Thoms ; P. formicarius, Gr. 



These Pczomachi were taken in the neighbourhood of 

 Norwich, and were named for me by Prof. Thomson, 

 who says the one I thought was a variety of P. analis is 

 P.faunus, the P. intermedius and P.furax are the same 

 species, and that P. juvenilis is a small variety of 

 P. rufidus ; he also says Foerster has made several 

 species of P. rufulus. I sent to him the species which 

 Mr. Marshall named for Mr. J. E. Fletcher as Hemi- 

 maclms trux ; this he returned to me named P. insolens, 

 thus confirming my opinion. P. trux must, I think, be 

 removed from our list. 



Pezomachus costatus, n. s. 

 Rufus, capite, apice antennarum, abdominisque apice, nigris. 

 Head large, slightly oblique behind the eyes ; antennae about 

 three-fourths the length of the body ; 2nd joint of flagcllum a little 



