HYMENOPTERA. 443 



or thickly punctured ; the antennae ferruginous, with the apical 

 half of the flagellum fuscous above ; the face below the antennae 

 yellow ; the margins of the clypeus and the carina above, black ; 

 the mandibles yellow, with their tips rufo-piceous. Thorax 

 delicately punctured, the metathorax more strongly so ; the 

 collar with an interru])ted stripe, the tegulae, scutellum and 

 post-scutellum, yellow ; the wings hyaline, the nervures ferrugi- 

 nous ; the legs ferruginous. Abdomen : the three basal segments 

 rufous, the three apical ones black ; the first segment punctured 

 at the base, the intermediate segments nearly impunctate, the 

 apical ones sparingly punctured ; the apical margins of the third, 

 fourth and fifth segments with a narrow pale yellow fascia, 

 slightly attenuated in the middle ; a spot on the margin of the 

 second segment, laterally. 



Hab. Siberia. 



29. Cerceris truncatula. 



Cerceris truncatula, Dahlb. Hym. Europ. i. 210. 124 (var. in- 

 terrupta ?). 



Hab. Sweden. 



This is probably a mere variety of C. interrupta : the females 

 sometimes have the clypeus slightly elevated. 



30. Cerceris spinipectus. B.M. 



Female. Length 8 lines. — Head yellow, with the cheeks 

 beneath and the maxillae black ; a black spot on the vertex 

 touching the orbit of the eyes, its hinder margin curved ; in 

 front are two black lines emanating from it and running down 

 to the base of each antenna ; two obliquely placed spots behind 

 the posterior stemmata ; the tips of the mandibles black. Thorax 

 black ; the collar, tubercles, two spots beneath the wings, the 

 tegulae, scutellum and post-scutellum, and a large ovate macula 

 on each side of the metathorax, yellow ; wings hyahne, a fuscous 

 cloud occupying the marginal cell, extending a little beneath it 

 and passing round the apical margins of the wings, the nervures 

 pale rufo-testaceous ; the mesosternum swollen and produced 

 laterally, where it is armed with a spine in the middle, and a 

 second at its postero-apical margin ; the legs orange-yellow. 

 Abdomen yellow, the extreme basal margin of the segments 

 black ; beneath, immaculate : — the entire insect strongly punc- 

 tured. 



Male. Length 6 lines, — Very closely resembles the other sex. 



