i6o HYMENOPTERA ACULEATA. 



(21) 22. Basal segment of abdomen narrow, 

 its apical band in the $ sud- 

 denly and widely dilated at the 

 sides PAHiETiNns. 



(16) 23. Sides and apical concavity of pro- 



podeum shining .... aNulope. 



(11) 24. Antenna simple in both sexes, basal 

 segment of abdomen not clothed 

 with long hairs, and with a slight 

 central fovea near its posterior 

 margin (Subg. Symmorphus, 

 Wesm.). 



(26) 2o. Larger, mesoplenras shining and 



almost impnnctate . . . crassicornis. 



(25) 26. Smaller, mesopleuroB distinctly punc- 

 tured. 



(28) 27. Abdomen with only three yellow 



bands siNTJATus. 



(27) 28. Abdomen with many yellow bands . gracilis. 



(Sdbg. HOPLOPUS.) 



0. spinipes, Linn. — Black, clothed with greyish black 

 hairs; head closely punctured in the (5*, with the clypeua, 

 mandibles and labrum, a narrow band bei ./een the 

 antennas, scape and second joint of the antei^nae beneath 

 yellow, the third to the seventh more or less ochreous 

 beneath, the ninth to the thirteenth flattened and form- 

 ing a spiral roll ; ? with only a narrow band or two spots 

 between the antennis yellow. Antennae simple, black ; 

 clypeus in the S strongly bidentate, in the ? very slightly 

 so, thorax closely and rugoseiy punctured, anterior 

 angles of pronotum scarcely produced, collar yellow, tegulte 

 in the ? yellow posteriorly, wings smoky in the basal 

 cells, nervures dark-brown ; abdomen rugoseiy punctured 

 on the basal segment, and clothed with longish hairs, ? 

 with a small fovea near the posterior margin, the other 

 segments shining and very finely punctured, all the 

 segments with a narrow simple apical band, except the 

 apical one, those of the ^ more or less abbreviated on the 

 third and following segments ; legs with the femora black, 

 yellow at the apex, intermediate pair in the c? dilated, 



