184 



MANDIBULATA. HYMENOPTEEA. 



Ic. bidentorius. Fahricius. — Steph. Catal. 348, No. 4392. 



Black : mouth, face, and basal joint of the antennae beneath yellow ; thorax 

 with a dot before, and another beneath, the wings also yellow ; metathorax 

 with 2 small acuminated tubercles ; abdomen with the 2nd and 3rd segments 

 yellow, the former with a broad and the latter with a narrow black margin ; 

 legs dull straw-colour, with the tips of the femora and tibiae fulvous, coxae 

 black, 4 anterior pale yellow beneath ; trochanters also black, 4 anterior 

 pale yellow beneath, posterior fulvous at the apex; wings somewhat smoky- 

 hyaline. 

 Also rare : found near London about June. 



Sp. 153. viridatorius. Niger, segmento uno phribusve fascia glaucd pictis, 

 pedibusfulvis, coxis et trochanterihus nigris : masjaciejlavd ; foemina aniennis 

 annulatis. (Long. corp. 6 — 7 lin. ; Esp. Alar. 10§ — 12 lin.) 



Ic. viridatorius. Gravenhorst, i. 428. — Steph. Nomen. 2d edit. col. 135. 



Black : mouth and face yellow, in the female the inner orbits alone only 

 faintly so; antennee of the male with the basal joint yellow !)eneath; of the 

 female with about the 9th to 17th, more or less, whitish, beneath reddish; 

 thorax in the male with a line or dot before the wings, and sometimes a dot 

 below them, and the scutellum yellow ; abdomen of the male with the base 

 of the 3rd segment yellowish, sometimes interrupted in the middle ; of the 

 female with the base glaucous, and the 4 following with the margins gene- 

 rally of the same hue ; legs fulvous, red in the female, coxae and trochanters 

 black, 4 anterior in the male with a more or less distinct yellow spot, 4 

 anterior femora sometimes a little blackish without or at the tip, and hinder 

 tibiae black at the apex ; tarsi fuscescent ; wings smoky-hyaline. 

 Scarce : taken in the New Forest, and occasionally near London, 



towards the end of June. 



Sp. 154. natatorius. Niger, annulo antennarum, punctis 2-bus baseos segmen- 

 toriim 2 et 3, nee non margine summo vltimomm albidis,femoribns tibiisque 

 Julvis, posticis apice nigra. (Long. corp. 7 — 8J lin. ; Exp. Alar. 14 — 17 lin.) 



Ic. natatorius. Fabricius. — Steph. Catal. 348. No. 4399. 



Black : inner orbits white, or reddish; antennse with about the 11th to 16th 

 joints white above; thorax sometimes with a minu'e white dot before, and 

 another below, the wings ; scutellum white ; abdomen with 2 rather obscure 

 lunate yellowish-white dots at the base of the 2nd segment, sometimes 

 united ; the 3rd with 2 distinct yellowish- white spots at the base, 1 towards 

 each side ; the 4th with the margins whitish in the middle, and the 7th with 

 a white dorsal spot; the intermediate ones sometimes with a faint white 

 margin ; legs red, with the coxae and trochanters black ; the posterior tarsi, 

 the apex of the hinder tibiae, and sometimes of their femora, also black; 

 wings smoky-hyaline, with the stigma red. 

 Rare : found in the vicinity of London, and in Devonshire, in 



July. 



