240 MA"NDIBULATA. — HYJIENOPTERA. 



of the male; beneath the scutellum in the male is a red dot, and in the 

 female, generally, a yellow one ; in the former sex the scutellum is red, and 

 in the latter entirely, or at the apex only, white ; abdomen of the male with 

 the basal segment channelled, the 3rd dull chestnut on the back ; of the 

 female fusiform, the basal segment slightly channelled, the remahider more 

 or less distinctly margined with whitish; legs moderate, fulvous, red in the 

 female, 4 anterior in the male pale or yellowish ; posterior with the tarsi 

 black, tibias white, with the extreme base and the apex black, spurs white ; 

 the tip of the femora sometimes black in the female ; wings hyaline ; cellule 

 wanting, or with a mere vestige of the outer nervure. 

 Found in July near London. 



Sp. 26. opticus. Niger, segmerito7'um. nonnullorum marginibus, lined ante alas, 

 oreque albidis, pedibus rufis, posticoruni tarsis niyris, tibiis albis apice nigro ; 

 thoracis picturis albidis aut rufis ; mas facie Jlavd. (Long. corp. 3 — 3i lin. ; 

 Exp. Alar. 5— 6iiin.) 



Tr. opticus. Gravenhorst, ii. 176. — Steph. Nomen. 2d edit. Gen. 715. 26. 



Black : face and mouth yellow in the male, the latter and clypeus white in the 

 female; mandibles black at the tip; eyes prominent; antennas of the male 

 fuscous, beneath rusty, with the 2 basal joints yellow ; thorax with a line 

 before the wings, another beneath them, a dot under the scutellum, a linear 

 spot on the breast, the lower part of the collar, and the suture between the 

 pro- and metathorax, and the scutellum yellow; of the female with the line 

 before the wings and dot beneath the scutellum and the tip of the last white; 

 the breast, lateral spot on the metathorax, and base of the scutellum red ; 

 abdomen beneath and with the margins of the 2nd to 4th, or to the 7th in 

 the female, white; legs fulvous, and in the females red; 4 anterior in the 

 male with the coxas and trochanters reddish-white, tibiae paler, posterior 

 tibise white, with the tip black, in the male, and black, with a white ring, 

 in the female ; wings hyaline ; cellule irregular, petiolated. 

 Taken in the vicinity of London in June, at Darenth wood. 



Sp. 27. htematodes. Niger, segmentorum marginibus summis albidis, scutello 

 pedibusque rufis, tarsis posticis et tibiarum posticarum apice nigris, ore et lined 

 ante alasflavis. (Long. corp. 3 lin.; Exp. Alar. 5^ lin.) 



Tr. haematodes. Gravenhorst, ii. 177. — Sieph. Nomen. 2d edit. Gen. 715. 27. 



Black : mouth yellow ; antennae rusty-brown, with the 2 basal joints black ; 

 thorax with a dot below the wings and a line before them, hooked at the tip, 

 yellow, the scutellum and a dot beneath dull red ; abdomen beneath yellow, 

 above with the margins of the basal segments distinctly whitish, and of the 

 3 terminal ones faintly so ; legs tawny-red, 4 anterior with the coxae and 

 trochanters beneath yellow, posterior with the tarsi and the tips of the tibiae 

 black; wings hyaline, iridescent. 

 Also found in June near London. 



Sp. 28. sternoxanthus. Niger, segmentorum }na7'ginibus obsoletissime albidis, 



