Heteror/yna and Fossorial Ilymenoptera. 293 



with occasionally a narrow sinuous band on the basal 

 segment, a transverse spot on each side of the '2nd and 

 3rd segments, rarely united, a spot on each side of the 

 4th, varying much in size, and the whole of the 5th 

 yellow ; apical segment piceous ; every variation of 

 colouring seems to exist between this and an entirely 

 black abdomen ; the <? has rarely more than a lateral 

 spot on each side of the '2nd and 3rd segments ; femora 

 black, those of the 3^ yellow in front, except the posterior 

 pair ; tibiae yellow, black posteriorly, posterior tibiae 

 yellow at the base ; tarsi of anterior and intermediate 

 legs yellow, of posterior legs piceous. Head and thorax 

 shining, punctured ; head with a distinct well-marked 

 spine on each cheek beneath ; prothorax straight in 

 front, its angles right angles ; metathorax crenate at 

 the extreme base, basal area shining, widely sulcate 

 down the middle, and bounded at the sides by a crenate 

 line ; metathorax at the sides hairy, and transversely 

 rugose ; abdomen finely punctured, somewhat elongate- 

 oval ; apical segment in the 5 flat above, with a few 

 large rugose punctures ; posterior tibiae in the ? spinose, 

 in the 3 with a few prominent spine-like hairs. 

 Length 8—10 mill. 



Hah. — Common. 



This very variable species maybe known at once by 

 the spine on the cheek beneath. 



21. cribyarins, Linn. Syst. Nat. ed. x. vol. i. p. 573, 

 Fig. Panz. Faun. Germ. 15, 18, 3 , 15, 19, ? . 



Head and thorax black ; scape of the antennae with a 

 yellow spot near the apex in the ? ; two spots on the 

 collar in both sexes, and the scutellum in the ? also, 

 yellow ; abdomen black, with a continuous band near the 

 apex of the 1st segment, an interrupted band on the 2nd 

 and 3rd, and a continuous band on the 4th and 5th 

 yelloAV ; in the 3 there is a yellow band also on the 6th 

 and 7th ; the 2 has the apical segment testaceous above ; 

 femora black ; tibiae and tarsi yellow ; patellae of the 

 front tibiae in the <? pale, spotted with small white 

 spots ; apex of the basal joint of the front tarsi and the 

 whole of the following joints black. Head punctured, 

 hairy, finely strigose between the eyes ; antennae in the 

 3 fusiform ; mesothorax longitudinally and rugosely 

 striate, sparsely clothed with brownish hairs ; metathorax 



