Heterogyna and Fossorud Hijmenoptera. 269 



4. dimidiatus, Jurine. Hym. pi. x. f. 22 = quttatus, 

 Shuck. 



Smaller than any of the abore. Thorax with the 

 tubercles only pale ; abdomen with the basal segment 

 and the base of the 2nd brownish red, sometimes the 2nd 

 segment of this colour all over, 2nd and 3rd segments 

 with a pale spot on each side ; tibiae and tarsi brown. 

 Head and thorax rugosely punctured ; apical, joint of the 

 antemifB in the S- twice as long as the penultimate, and 

 bisinuate beneath ; abdomen dull, with scattered, shallow, 

 punctures, beneath with the ventral prominence almost 

 obsolete. 



Length 7 mill. 



This very distinct little species is rare, but has occurred 

 at Hastings, Littlehampton, Hampstead, Highgate, Wey- 

 bridge, Southend, and Deal. July and August. 



GoRYTES, Latr. (Plate VHI. figs. 36 and 37). 



Hist. Nat. vol. xiii. p. 308. 



Like Nysson in coloration, but has the 2nd sub- 

 marginal cell simple, and the 4th almost completed. 

 The metathorax rounded posteriorly. 



(2) 1. (^ antennfe longer; tibiae more or less black; 2 

 basal joint of abdomen much narrower than 2nd, 

 with only two spots . . . . . . . . mijstaccus. 



(1) 2. ^ antennae shorter ; tibise entirely yellow ; J basal 

 joint of abdomen not mnch narrower than 2nd, 

 with a complete yellow apical band .. .. campestris. 



1. mystacens, Linn. Faun, Suec. ed. ii. p. 412. Fig. 

 Panz. Faun. Germ. 53, 11, ? . (Plate VHI. fig. 37). 



Black, two spots at the base of the clypeus, a band at 

 the base of the prothorax, the tubercles, the scutellum 

 in the ? , an interrupted band on the basal segment of 

 the abdomen, and an entire band on the 2nd and 3rd, and 

 occasionally a spot on the 4th, yellow. Tibise in the ^ 

 outwardly yellow ; tarsi fuscous, paler at the base ; tibiae 

 and tarsi in the ? entirely fulvous. Head and thorax 

 deeply and closely punctured, covered wdth greyish hairs ; 

 face below the antennae in the 3' with silvery hairs ; 

 antennae in the ^ very long, reaching to about the middle 

 of the 2nd abdominal segment ; basal area of the meta- 

 thorax longitudinally ridged, with a deep central furrow, 



