108 MANDIBULATA. — HYMENOPTERA. 



subclavate abdomen, especially of the males, which is scarcely com- 

 pressed in the females, appear sufficient to remove them from 

 Cephus. 



Sp. 1. connectens. Plate xxxvii. f. 2. — Ater nitidus, pedibus Jlavo-testaceis, 

 tarsis posticisfuscis, antennis infra luteis. (Long. corp. 2f lin. ; Exp. Alar. 

 6lin,) 



Ja. connectens. Steph. Catal. 341. ISIo. 3992. 



Shining black : antennse luleous beneath^ especially at the apex : mandibles 

 yellow at the base, the apex pitchy ; palpi pitchy ; thorax with a minute 

 yellow dot on each side beneath the base of the wings ; abdomen with the 

 membrane yellowish, the extreme tip above testaceous, and the 3 or 4 last 

 segments beneath yellowish; femora and tibire all entirely testaceous- 

 yellow j 4 anterior tarsi the same, the hinder pair fuscous ; wings hyaline, 

 with the nervures, costa, and stigma yellowish-brown. 

 Extremely rare, apparently : taken near Hertford in June. 



Sp. 2. femoratus. Ater iiitidus, pedibus obscure rufo-testaceis, tibiis posticis 

 apice tarsisque posterioribus nigris, tibiis inter?nediis et posticis basi Jlavis. 

 (Long. corp. 4^ lin. ; Exp. Alar. 7^ lin.) 



Ce. femoratus. Curtis, v. \\i. pi. 301. — Steph, Nomen. 2d edit. col. 130. 



Shining black : tip of the mandibles testaceous ; palpi pitchy ; abdomen with 

 the basal membrane pale yellow ; legs dull testaceous, the hinder femora 

 dusky at the tip, posterior tibiae black at the apex, their base, and that of 

 the intermediate ones, yellow ; the 4 posterior tarsi and the tips of the 

 anterior ones black; wings hyaline, iridescent, the nervures, costa, and 

 stigma pitchy. 



The hinder femora and the middle of the 4 anterior ones are sometimes black, 

 and the nervures, costa, and stigma of the anterior wings are very dark : — 

 probably a distinct species. 

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



in June ; and the variety at Darenth wood at the same time of the 



year. 



Family II.— XIPHYDRIIDtE, LeacJi. 



Wings with the marginal areolets complete : mandibles rather short, denticu- 

 late within : labium entire, or wanting : maxillary palpi with 4 joints, labial 

 with 3 or 4 : ovipositor inclosed between 2 serrated lamella, and considerably 

 exserted : antenna various. Larva cylindric, fleshy, apterous. 

 The insects of this family, as their name implies, are found in 

 wood, in which they appear to perforate cylindrical holes, like those 

 of the following; but the larv£e, Sec. have not hitherto been de- 

 scribed, I believe. 



