23° 



H VMENOP TERA A CULEA TA. 



the fourth ; ? , third joint of antennse 

 longer than the fourth and fifth to- 

 gether, or at any rate twice as long as 

 the fourth. 



(21) 20. Abdomen clearly punctured on a nearly 



smooth surface, nearly always more 



or less red plouea. 



(20; 21. Abdomen not clearly punctured on a 

 nearly smooth surface ; not red. 



(25) 22. (J, abdomen clothed with pale hairs, not 

 polished ; thorax with bright fulvous 

 hairs and mandibles with a large basal 

 tooth, or tibia3 pale at the apex ; ?, 

 abdomen densely clothed with black 

 or bright fulvous red hairs. 



(24.) 23. (;J with mandibles toothed at the base; 



$ , abdomen fulvous haired . . pulva. 



(23) 24. cJ, mandibles simple; ? .abdomen black 



haired Cla.rkei.la. 



(22) 25. c?, tibiae entirely black or abdomen 



polished, mandibles toothed at the base 

 only in species which either have the 

 abdomen polished or the thoracic hairs 

 sooty brown ; ? , abdomen not black 

 or bright fulvous-haired. 



(31) 26. (J, head of normal size, vertex not quad- 

 rate, mandibles simple ; scopas of ? 

 fulvous. 

 Large species, 12-14 mm. 

 Small species, 9-10 mm. 

 jj, third joint of antennas not so long as 

 the two following together ; $ , third 

 joint slightly longer than the follow- 

 ing two ...... 



^ , third joint of antennae longer than 

 thetwofollowingtcgether, 5 , third joint 

 almost equalling the three following . 

 (J, mandibles toothed beneath at the base, 

 or head large, with subquadrate vertex ; 

 scopffi of ? brown or black. 

 (J, mesonotum clothed with sooty brown 

 hairs ; ? , fifth abdominal segment 

 clothed with pale hairs, or with the 

 third autennal joint very long and 

 slender at its base, which is not 

 more than half as wide as its 

 apex. 



(34) 33. Larger, first recurrent nervure re- 

 ceived near the apex of the second 

 submarginal ; basal mandibular tooth 

 in c? pointed, fifth abdominal seg- 

 ment in ? clothed with black hairs . lapponica. 



(33) 34. Smaller, first recurrent nervure re- 



KIGRO.ENEA. 



Gwynana. 



ANGUSTIOB. 



