134 MANDIBULATA. — HYMENOPTEEA. 



Black : face and a portion of the outer orbits of the eyes pale yellowish ; front 

 with a large black patch ; palpi whitish-yellow ; abdomen rather slender, 

 somewhat silky, opaque and punctured at the base, shining and impunctate 

 at the apex ; anterior legs and tarsi light red, with the coxee and trochan- 

 ters, and the posterior legs and tarsi entirely black; antennse with the basal 

 joint whitish, or pale yellow beneath ; wings hyaline, sometimes slightly 

 stained; scales and costa blackish; stigma pale reddish-brown. 



In some examples the face is almost entirely black, and the basal joint of the 

 antennse immaculate. 



Larva feeds on that of Biston prodromarius. 



Not common : found near London in June, and in Salop. 



Sp. 20. tristis. Niger, femoribus omnibus et tibiis anterioribiis rujis, stigmate 

 nigro, cellula S-angulari. (Long. corp. 5 — 6 lin. ; Exp. Alar. 10 — llj lin.) 



Ic. tristis. Gravenhorst, i. 136. — Steph. Nomen. 2d edit. col. 131. 



Black : antennse about half the length of the body, with the 3rd to 14th joints 

 ferruginous beneath ; abdomen rather longer and narrower than the head 

 and thorax, the 1st segment punctured, a little coarctate towards the base, 

 and rather broader than the peduncle, which is stoutish ; legs moderate, 

 red, coxae and trochanters black, posterior tibiae fuscous or black, with the 

 extreme base red; hinder tarsi black; wings hyaline, with the stigma, 

 costa, and scales black ; cellule 3-angular. 

 Somewhat rare: taken in June near London. 



Sp. 21. rubellus. Niger, femoribus tibiisque ruJis, stigmate piceo, segmenii2-di 

 margine summo castaneo ; foemina antennis rujis, annulo albo obsoleto. (Long, 

 corp. 2^— 3i lin.; Exp. Alar. 6g lin.) 



Ic. rubellus. Gvielin. — Steph. Nomen. 2d edit. col. 131. 



Black : antennse rather slender, in the females red, with the basal joint 

 fuscous, 10th to 12th above whitish; palpi red; abdomen silky, finely 

 punctured, the extreme margins of the 2nd, and frequently of the 3rd seg- 

 ments chestnut; legs red, coxee and trochanters black, anterior beneath red 

 in the female, posterior generally with the extreme tip of the femora and of 

 the tibisB black; tarsi black, with the 1st and 2nd joints red; wings smoky- 

 hyaline, the stigma and costa fuscous or pitchy ; in the female somewhat 

 luteous; scales yellow or gilvous, sometimes brownish at the base, but 

 rarely entirely brown. 

 Not common : taken within the metropolitan district in June. 



Sp. 22. rufifrons. Niger, facie rufescente, tibiis femoribusque anterioribus 

 gilvis, antennis albo-unnulaiis. (Long. corp. S^ lin.; Exp. Alar. 7 lin.) 



Ich. rufifrons. Gravenhorst, i. 139. — Steph. Nomen. 2nd edit. col. 131. 



Black : orbits, face (which is gibbous), labrum and mandibles chestnut ; palpi 

 fuscous ; thorax with a short line beneath the scutellum, a dot beneath the 

 wings, and the upper margins of the collar, of a faint bay-colour ; abdomen 

 ovate, black-brown, the 2nd segment with 2 very obsolete dots at the base, 

 and the extreme edge chestnut, the 6th and 7tU with the extreme margin 



