176 Mr. E. Saunders' Si/nopsis of 



$ differs from the 3' in having the clypeus black, and 

 sometimes with a transverse yellow band at the base, in 

 having the posterior margin of the post-scutellum, as 

 well as that of the scutellum, yellow, and in having the 

 red of the basal segment more extended ; the apical 

 bands of the abdominal segments are also wider, and 

 the whole insect rather more robust. Length 12 — 

 13 mm. 



Very rare. ? Stowborough Heath (Eothney) ; c? Isle 

 of Portland (C. W. Dale). 



Subgenus 11. Ancisteocerus. 



(2) 1. 2nd segment of body beneath slightly raised to- 

 wards the base, then falling abruptly to the 

 level of the transverse crenate sulcature .. nillosus. 



(1) '2. '2nd segment of body beneath not raised towards 

 the base, and not abruiJtly truncate above the 

 basal sulcature. 



2nd segment of body beneath not longitudinally 

 convex ; costa; of basal sulcatuie short . . . . parietum. 



2nd segment of body beneath more or less convex 

 longitudinally ; cost* of basal sulcature long. 



Concavity of metathorax, above the insertion of 

 the body, somewhat shining .. .. .. Antilope. 



Concavity of metathorax quite dull. 

 7. Mesothorax, between the tegula?, longer than wide trifasciatus. 

 Mesothorax, between the tegula;, not so long as 

 wide. 

 9. Body with only three yellow bands . . . . trimurijinalus. 



Body with many yellow bands. 

 Basal segment of body wide ; its ajncal band in 

 the 5 linear throughout . . . . . . . . pictiis. 



(11) 12. Basal segment of body narrow ; its apical band in 



the 5 laigely and suddenly dilated at the sides . . ^jwr/t'^/ziHs. 



6. Odj/neriis cdllosiis, Thoms. 



Thoms. Opusc. Ent. i., p. 87 ; Hym. Eur., pt. 3, p. 61 ; 

 = qtiadratus, Smith, Brit. Foss. Hym., &c., p. 207 (nee 

 Panz. '?). 



Black ; mandibles, clypeus, entirely in the <? and some- 

 times with two spots in the ? , scape of the antennae in 

 front and a spot between the antennae in both sexes, and 

 a spot on each side of the prothorax, two small spots on 

 the tegultB, and sometimes a spot below the wings, two 

 spots on the scutellum, a wide apical band on each 

 abdominal segment, the basal one widely and squarely 



