Pezomachus:\ BRITISH ICHNEUMONS. IQI 



joints sub-nioniliform, inserted almost level with the lower angle of the 

 eyes ; basal flagellar joint distinctly shorter than the second and shorter 

 than the scape ; the fifth slightly broader than long. Meso- and nieta- 

 notum of equal length ; petiolar area sub-vertical, short, rugose and 

 centrally impressed ; its basal costa wanting, a[)ophyses small and ap- 

 proximating apex. Abdomen finely alutaceous, difi"usely but distinctly 

 punctate, with short pubescence ; basal segment somewhat short, gradually 

 and strongly explanate ; post-petiole sub-convex and apically very broad, 

 with the tubercles not prominent ; terebra of variable length. 



Head dull black ; antennae piceous with the scape apically flavescent. 

 Thorax black, sometimes with the prothorax and front of mesonotum 

 rufescent. Abdomen black ; apex of first segment and the base and sides 

 of the second narrowly fulvescent. Legs immaculate fiavous, with the 

 apical tarsal joint brownish (type form), or more or less marked with piceous. 



$ . Winged. Antennae inserted below the centre of the orbits, stout, 

 scarcely attenuate towards their apices. Metathorax finely rugose with 

 the areola indistinct. ^Vings with the stigma not broad and the nervellus 

 antefurcal. Post-petiole broad and sub-convex ; the second and third 

 segments sub-rugosely punctate. 



Black ; apices of anterior femora, broadly, and all the tibiae pale, with 

 the posterior black at base and apex. \\'ings griseous and coxae black. 

 Length, 3-5 mm. 



This speeies was placed by Forster in a distinct genus on account of its 

 very short and broad face and clypeus, and narrow mandibles. Thomson, 

 however, did not consider it merited generic rank, and thought it 

 synonymous with Pezomachus aries and P. ecari7iatus ; to these I have 

 ventured to add P. forliconiis^ which differs only in its sub-obliqne petiolar 

 area, bearing a faint indication of a basal costa, and has the four basal 

 flagellar joints dark red and the apical margins of all the segments inde- 

 terminately red. 



This is the "P. arenarius, Hal." of the British Museum collection. 



It is by no means uncommon with us, though I know of no records. 

 Deal, in May, 1872 (E, Saunders) ; Felden in Herts. (Piffard) j Shere in 

 Surrey (Capron) ; Niton, Isle of Wight (Marshall). I have found it on 

 the banks of the Gipping at Ipswich, in July ; in Aim caespitosa in the 

 Bentley Woods, in November and December ; running on sand with 

 Lasius tiiger at Foxhall in August ; at roots of Senecio Jacolxiea at Brandon, 

 in June ; on the coast at Southwold and Lowestoft, among Cruciferae and 

 Ononis ; and Elliott has swept it in Burwell Fen, in Cambridgeshire. 



I have no hesitation in ascribing P. inelanophonts to the present s[)ecies, 

 from the female of which it differs only in its parallel-sided post-petiole, 

 longer basal flagellar joints, small scutellum and punctiform wings. It has 

 not been noted in Britain hitherto, but I was so fortunate as to capture an 

 example in a crag-pit at I'oxhall, near Ipswich, early in June, 1898. 



8. cautus, Font. 



Pezofiiachm bicolor, (Ir. I. \i. ii. 902 (p.irt). /'. lautiis, Furst. Wiej;m. .Arch. 1S50, 

 p. 190, 9. [(?) Hemintachus ru/ipes, liridg. Tmns. Ent. Soc. 1883, p. 157, <J . | 



9 . Head dull, very finely |)unctate and much broader liian the thorax. 

 Antennae somewhat elongate, with the basal flagellar joint slightly longer 



