158 MANDIBUlATA.— HYMENOPTERA. 



Sp. 85. leucomelas. Niger, orbitis oculorum verticis albis : mas orbitis oculorum 

 Jacialibus, foemina annulo antennarum, albis. (Long. corp. 5 — \ lin. ; Exp. 

 Alar. 10—11 lin.) 



Ic. leucomelas. Gmelin. — Steph. Nomen. '2nd edit. col. 133. 



Black : vertical orbits very broadly white in the female, and the facial ones 

 white in the male ; antennae of this sex with the basal joint white below ; 

 female with the 9th to 16th, more or less, white above and on the sides ; thorax 

 of the male with a white dot before and another below the wings ; scutellum 

 white, of the female sometimes reddish at the base; abdomen finely punc- 

 tured, of the female with a dorsal white spot on the 6th and 7th segments, 

 of the male with the margin of the 6th and entire back of the 7th white ; 

 legs black, anterior femora below entirely and middle ones at the apex, and 

 the 4 anterior tibise beneath straw-coloured in the male ; anterior tarsi 

 slightly so, and the middle fuscous ; of the female the anterior tibise are 

 rusty or fuscous within; wings smoky-hyaline; stigma, costa, and scales 

 black ; cellule nearly 5-angular. 

 Not very abundant : taken within the metropolitan district in June, 



and in Devonshire. 



Sp. 86. microcephalus. Niger, antennarum annulo orbitisque facialibus tenuis- 

 simis albis, capite parvo. (Long. corp. 6 — 7 lin.; Exp. Alar. 10 — 12 lin.) 



Ic. microcephalus. Steph. Nomen. 2d edit. Appendix. 



Black : head very small ; inner orbits faintly white; antennae with the 10th to 

 16th joints, more or less, white; thorax immaculate; scutellum entirely 

 white, or at the tip only in the female ; abdomen slender and glossy in the 

 male, wider and somewhat opaque in the female, the 2 last segments with a 

 white dorsal spot; legs black, anterior tibiae slightly ferruginous in front; 

 wings hyaline, stigma red, costa and scales black; cellule somewhat 

 3-angular. 

 Found near London and in Scotland, in June. 



Sp. 87. computatorius. Niger, antennarum annulo albo, tibiis posticis versus 

 basin ferrugineofuscis. (Long. corp. 5 — 6| lin. ; Exp. Alar. 12—14 lin.) 



Ic. computatorius. Muller, 1769. — Steph. Nomen. 2d edit. col. 133. 



Black: antennae brownish beneath, with the 9th to 16th joints, more or less, 

 white ; frontal orbits sometimes obscurely reddish; thorax occasionally with 

 a white dot beneath the wings ; scutellum white ; abdomen with the 2nd 

 and 3rd segments finely punctured and somewhat opaque, sometimes with 

 the extreme margins slightly chestnvit, and the 2nd very rarely entirely dull 

 bay black, the 6th and 7th with a white dorsal spot, the 5th occasionally 

 with a minute one ; legs dull black, anterior femora ferruginous or ochreous 

 at the tip, the tibise beneath the same ; middle with the inner edge of the 

 tibiae, at times the tip of the femora and the tarsi ferruginous ; posterior 

 with the tibiae rusty-brown on the outer edge towards the base ; wings 

 smoky-hyaline, stigma red or fuscescent, costa the same ; scales black ; 

 cellule 5-angular. 



