186 MANDIBULATA.—HYMENOPTERA. 



Black : greater portion of the head yellow, the male with an irregular patch on 

 the crown, and a spot on the cheek, and the female with a longitudinal 

 patch in front carried on to the occiput black ; antenna) with the basal 

 joint yellow beneath, of the male porrect, with the llth to 19th joints with 

 a yellow dot above ; of the female incurved at the tip, with about the 10th 

 to 18th joints yellow above and on the sides ; thorax with the anterior 

 edges of the collar, its lateral margin, a dot before, and line beneath the 

 wings, an irregular patch on the pleurae, 2 dots on the disc, 1 beneath 

 the scutellum, and 2 larger ones on each side of the metathorax and the 

 scutellum tawny-yellow, especially in the female; abdomen of the male 

 with a large yellow patch on the sides of each apical angle of the 3 basal 

 segments, and in the female of the first 2, those on the basal segment, in 

 each sex, sometimes united ; legs yellow, middle coxse black at the base, 

 posterior black, with a large yellow patch, trochanters black, 4 anterior 

 femora more or less black at the base within, posterior pair black, with the 

 apex yellow ; 4 anterior tibiae fuscous, and the posterior pair black, at the 

 base ; tarsi with the tips of the joints of the hinder pair blackish in the 

 female. 

 This, which is perhaps the most beautiful species of the genus, has 



occurred, but very rarely, in the vicinity of London, in June. 



Sp. 158. designatorius. Niger, orbitis oculorum internis, lineis 2-bus ad alarum 

 radicem, puncioque laterali segmentorum anteriorum albis. (Long. corp. 7 — 8 

 lin.; Exp. Alar. 11— 13 lin.) 



Ic. designatorius. Linne. — Sieph. Catal. 348. No. 4397. 



Black : palpi and inner orbits broadly white ; antennae with about the 13th to 

 ITth joints white above; thorax with a distinct line before the wings, a dot 

 below, and sometimes 2 contiguous ones beneath the scutellum, and the 

 latter white ; abdomen bluish-black, with a white dot on the margin of each 

 side of the 4 basal segments ; legs black, 4 anterior femora at the tip, and 

 their tibiae and tarsi beneath whitish ; wings smoky-hyaline ; cellule some- 

 what 5-angular. Female said to have the frontal orbits slightly whitish, 

 the antennae curved at the apex, with about the 10th to 15th joints white 

 above, and the legs reddish, where they are Avhitish in the male. 



Of the male with black antennae, with the basal joint white beneath: I have 

 not seen a British specimen. 

 Also very rare : it has been taken in the New Forest and in 



Scotland, in July. 



Sp. 159. eximius. Cceruleo-niger, orhitis oculorum frontalibus et externis picturis 

 thoracis lateribusque scutelli Jlavo-albidis, annulo antenna7-um albo. (Long, 

 corp, 54 lin. ; Exp. Alar. 9 lin.) 



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



Blue-black : frontal and exterior orbits yellowish-white ; antennte involuted, 

 with about the 8th to 13th joiuts white above; thorax with the lateral 



