212 MANDIBULATA. HYMENOPTERA. 



frequently irregular and petiolated, rarely suborbicular : abdomen oblong or 

 subovate, with the basal segment somewhat convex and smooth anteriorly, 

 the peduncle very slender: legs slender, long, sometimes a little abbreviated, 

 and with the femora, especially the hinder one, thickened. 

 Known from Typhon by having the abdomen oblong or somewhat 

 ovate, with the basal segment smooth and rather convex anteriorly, 

 and supported by a very slender peduncle ; the legs and antennae 

 more or less elongate and slender: some of the species are very 

 closely allied to those of the following genus, and are to be discrimi- 

 nated with great difficulty : there is, nevertheless, a certain degree of 

 diversity in habit between them, by which a practised eye can readily 

 distinguish them. 



§ I. Scuiellum and abdomen black, the extreme margins of the segments of the 

 latter sometimes pale. 



Sp. 1. narrator. Niger, tibiis anterioribus nigris. (Long. corp. 5 lin. ; Exp. 

 Alar. 8.^ lin.) 



Me. narrator. Gravenhorst, ii. 11. — Steph. Nomen. 2d edit. Gen. 714. 1. 



Slender, black : palpi and mandibles fuscous, the tips of the latter black ; 

 antennse incurved at the tip ; abdomen narrower than the thorax, and 

 somewhat cylindric towards the apex, the basal segment Avith 2 raised lines, 

 peduncle slender, 2nd to 5th of equal breadth; legs moderate; anterior 

 femora testaceous, fuscous towards the base, middle fuscous with the tip 

 testaceous, the 4 anterior tibiae and tarsi testaceous, the posterior brown- 

 black ; wings smoky-hyaline ; cellule wanting. 

 Scarce : taken in June in the vicinity of London. 



Sp. 2. qviadriannulatus. Niger , fe?noribus tibiisque rufts, aimulo antennarum et 

 tarsorum posticorum albo. (Long. corp. 4 — 5 lin.; Exp. Alar. 9 — 10 lin.) 



Me. quadriannulatus. Gravenhorst, ii. 13. — Steph. Nomen. 2dedit. Gen. 714.2. 



Black : palpi testaceous ; frontal orbits faintly white ; antennae slender, curved 

 at the tip, the 11th to 14th joints white; thorax with a dot before and 

 another beneath, and a very minute dot at the tip of the scutelluin also 

 white ; abdomen lanceolate, narrower than the thorax, the anterior portion 

 of the basal segment quadrate, twice as short and broader than the peduncle, 

 with the lateral tubercles a little prominent ; legs slender, coxae and tro- 

 chanters black; femora red, the posterior black at the extreme tip; tibiae 

 testaceous, the hinder pair fuscous at the apex ; tarsi fuscous, 4 anterior 

 with tlie basal joint red, posterior with the 3rd and 4th joints and tip of the 

 2nd white ; wings somewhat smoky-hyaline ; cellule 3-angular. 

 Also rare : found in June and July, near London. 



Sp. 3. sericeus. Niger, sericeus, pedibtis, ore, et antennarum basi testaceis, coxis 

 posierioribusfuscis. (Long. corp. 3^ lin.; Exp. Alar. 5i lin.) 



