British Hynienopteni. 227 



punctured ; posterior margins of the segments smooth ; 1st and 

 2nd segments clothed with black hairs ; 1st often with yeUow hairs 

 intermixed or entirely yellow ; 3rd with black hairs at the base and 

 yellow hairs at the apex ; 4th and 5th with white ; 6th with white 

 intermixed with black ; 7th with black ; beneath shining, largely 

 pmictured ; genital armature with the lacinia short, triangular ; 

 the sagittae not toothed beneath (see PL XI., fig. 7). Legs clothed 

 with black hairs ; apical joints of the tarsi piceous, with reddish 

 han-s ; posterior tibiae rounded and punctured ; posterior metatarsi 

 long and as wide as the tibia;. 



?. Larger and stouter than the ^, but similarly coloured; 

 pubescence of the 3rd segment of the abdomen widely yellow at 

 the apex ; 6th segment above shining, narrowly grooved towards the 

 apex, sides and apex clothed with short velvety brown pubescence ; 

 beneath shining, largely punctured, clothed with black hairs ; 6th 

 segment with a longitudinal elevation on each side close to the 

 apex ; apex simple, clothed with brown velvety hairs ; posterior 

 metatarsi wide, as wide nearly as the tibiae. Legs clothed with 

 black hairs outwardly ; posterior tibiae and all the tarsi with brown 

 hairs on the side towards the body. Length, 18 — 22 mm. 



Hah. Common and generally distributed. Lives with 

 Bomhus terrestris. 



3. Psithyrus Barhutelliis, Kirb. (PI. XI., figs. 6 — 6 b). 

 Kirb., Mon. Ap. Angl., ii., j). 343 (nee Smith). 



Black, clothed with black hairs ; both sexes with some of the 

 hairs on the vertex of the head, a band across the front of the 

 thorax, and a band behind the scuteUum, yellow ; ^ with the 3rd 

 joint of the flagellum much shorter than the 2nd ; 4th and 5th 

 subequal, 4th longer than the 2nd by about one-fourth of its 

 length in both sexes. Abdomen with the basal segment more or 

 less clothed with yellow hairs intermixed with the black, sometimes 

 entirely yehow, rarely entirely black ; 4th, 5th, and 6th segments 

 with white hairs ; no yellow hairs at the apex of the 3rd ; 7th in 

 the ^ with black hairs ; 6th in the ? rugosely punctured, with a 

 raised dorsal line ; 6th segment beneath in the ^ with two slightly 

 raised tubercles at the apex ; 6th in the ? with its edges reflexed 

 at the apex and somewhat thickened ; posterior metatarsi distinctly 

 narrower than the tibia; ; genital armatiu-e of the ^ with the 

 sagittae beneath armed with a large triangular tooth (see PI. XL, 

 figs. 6—6 b). Length, 17—20 mm. 



<y . Differs fi-om that of vestalis in having the vertex clothed 

 more or less with yellow hairs, in having a yellow band on the 



