236 MAls'DIBULATA, HYMENOPTERA. 



black towards the base, posterior coxae black, trochanters yellow ; femora 

 black, with the extreme tip yellow, tibise whitish or yellow, with the apex 

 black ; hinder tarsi of the male black, with the base of the first 3 joints 

 ■white, of the female fulvous, with the tips of all the joints black. 



The females of this, as also of Tr. varitarsus, and other species, are remarkable 

 for bearing a mass of vesicular appendages beneath the abdomen. 

 Not common : taken at Darenth wood in May, and in other places 



within the metropolitan district. 



Sp. 15. nsvius. Niger, marginihus segmentorum summis aUndis, pedibus rufis, 

 posticorum tarsis et tibiarum apice fuscis, facie et thoracis picturis Jlavis. 

 (Long, corp. 2| — 4 lin.; Exp. Alar. 4 — 7 lin.) 



Ich. niEvius. Gmelin Lin. 2699. — Tr. ngevius. Steph. Nomen. 2d edit. Gen. 

 715. 15. 



Black : mouth, face, and a dot on the cheeks yellow, mandibles black or rusty 

 at the tip ; antennas nearly as long as the body, curved at the apex, fuscous 

 or rusty, vrith the basal joint beneath yellow in the male, rusty in the 

 female, in which sex the thorax has a yellow dot before the wings, the male 

 a line before them, a streak beneath the lower part of the collar, and a broad 

 streak or 2 narrow ones on each side of the breast, yellow ; abdomen with 

 the margin of the 2nd segment generally reddish, and of the 4th to 7th 

 whitish ; legs of the male slender, 4 anterior tawny-red, with the coxee and 

 trochanters yellow; posterior the same, with the trochanters yellowish 

 beneath, the tarsi and apex of the tibiae, and sometimes of the coxae, black ; 

 of the female the legs are red, with the 4 anterior coxte testaceous, the hinder 

 tarsi brown and the tibiae testaceous, with the tips fuscous; wings hyaline; 

 cellule somewhat regular and petiolated, 3-angular. 

 Rare : found near London in July. 



Sp. 16. fasciatus. Niger, tarsis tibiis<pie anterioribus femoribitsque rujis, seg- 

 mentis 2 et Sfascij castaney. (Long. corp. 3 lin. ; Exp. Alar. 5 lin.) 



Tr. fasciatus. Gravenhorst, ii. 139. — Steph. Nomen. 2d edit. Gen. 715. 16. 



Black: palpi pitchy straw-colour; antennae slightly curved at the tip; 

 abdomen narrow, oblong, somewhat sessile; the basal segment with an 

 obsolete channel, the 2nd and 3rd with an obscure chestnut fascia towards 

 the margin, the last sometimes interrupted; legs moderate, tawny-red, with 

 the coxae and trochanters black; posterior pair with the tips of the femora* 

 the tarsi and tibise blackish, the latter reddish towards the base ; wings 

 hyaline ; cellule small, irregular, somewhat petiolated. 

 Scarce ; found in June near London. 



Sp. 1 7. nanus. Niger, basi antennarumjlava, pedihus fulvis , coxis anferioribus 

 albis, posticis nigris, cellula 5-angulari. (Long. corp. If lin. ; Exp. Alar. 

 3 lin.) 



Tr. nanus. Gravenhorst, ii. 155. — Steph. Nomen. 2d edit. Gen. 715. 17. 



Black : palpi white ; mandibles yellow ; face m ith a griscous pile ; antennae 



