1^4 MANDIBULATA.—IIYMENOPTERA. 



yellow^ the first 2 joints black above, reddish beneath ; the upper portion 

 deep black ; thorax with a streak before, and a dot beneath, the wings and the 

 scutellum yellow ; abdomen with 2 dull yellowish spots on the 2nd segment, 

 the 6th and 7th whitish-yellow, or glaucous above ; legs bright yellow, 

 with the coxse, trochanters, and tips of the hinder femora and tibiie black ; 

 the hinder coxse and trochanters yellowish at the tip above ; wings slightly 

 smoky-hyaline, stigma pale saffron. 

 Apparently very rare ; taken in the north of England. 



Sp. 128. vaginatorius. Niger, facie Jlavomaculata, segmentis 2, 3, 6 ef 7 toto 

 margine, 4 margine medio interrupto,Jlavis,femoribus tihiisque dilute croceis, 

 posticis apice nigro. (Long. corp. 5 — 6h lin.; Exp. Alar. 10—11 lin.) 



Ic. vaginatorius. Linne. — Steph. CatuL 348. No. 4394. 



Black : face more or less spotted with yellow ; palpi pale, with the base 

 dusky; antennse porrect, basal joint fuscous, remainder generally black 

 above or reddish, and beneath red, with the 1st joint yellow; thorax with a 

 line beneath, and a spot before, the wings, with the upper edge of the collar 

 whitish-yellow ; scutellum yellowish ; abdomen with 2 or 3 yellow dots on 

 the margin of the 1st segment, the 2 following segments with a marginal 

 fascia, waved towards the middle, the 4th with an interrupted marginal 

 band, the 6th with an entire fascia, and the 7th with an entire, or interrupted 

 one, all yello wish- white ; legs pale yellow; tibiae and tarsi pale, coxae, 

 trochanters, apex of the hinder femora and tibiaB, and of the joints of the tarsi 

 black ; wings yellowish-hyaline. 



The segments of the abdomen are less broadly edged with yellow in some 

 examples than others, especially the 4th, in which the border sometimes dis- 

 appears, and the 5th in rare instances is margined. 



I know not the female of this common insect, unless it be the following.* 

 Abundant in June and July throughout the metropolitan district, 



frequenting umbelliferous flowers, &c. : common also in other parts, 



as in Devonshire, South Wales, Norfolk, Scotland, &c. 



* Although in p. 122 I stated that, in proceeding with the insects of this 

 family, I should not materially depart from Gravenhorst's arrangement, I must 

 here, however, necessarily do so, since that laborious writer appears, in nume- 

 rous instances, to have separated the sexes from each other, and especially so 

 in those insects which he has placed in this and the following sections ; to 

 which I shall more particularly refer when treating of them. I regret my 

 present inability to investigate this point again practically, but I trust that 

 after the conclusion of these Illustrations, in accordance with the proposed 

 plan, to do so in the interim of preparing the 2 supplementary volumes, that 

 may probably be added a few years hence, in order to correct the unavoidable 

 errors I may have committed in so vast a field, as well as to add such novelties 

 as may have been then discovered. 



