74 WM. H. ASHMKAD. 



Antennae similar in both sexes, never deformed in the % 6. 



Lntennse dissimilar in the sexes, in % deformed, in 9 filiform, simple; 

 scape always stout; first dorsal abdominal segment at base convex not 

 broadly impressed, at most with a longitudinal sulcus; stigma in front 

 wings well defined. 

 Flagellum iu % thickened, the joints compressed, submoniliform, nearly 

 of an equal length, the terminal joint abruptly constricted into a slen- 

 der curved spine; scape large, robust; pygidium triangular, the apical 

 angles of the sixth dorsal segment dentate; second ventral segment 



with a median prominence or ridge Alcitfaiuea Cress. 



Flagellum in £, with the joints of an unequal length, joint 2-5 compressed, 

 dilated, joint 6 suddenly narrowed towards apex, the apical joint sim- 

 ple ; scape rather long and robust, slenderer towards base ; abdomen 

 elongate; pygidium obtusely triangular, with a deep transverse im- 

 pression on disk, the apical lateral angles of the sixth segment den- 

 tate; first ventral segment subtriangularly produced at apex. 



V ndrouicus Cress. 

 5. Body black or blue-black, the thorax with a griseous pubescence, sometimes 

 mixed with black hairs; mandibles at apex very broad, 4-dentate, or 

 at least trisinuate ; 9 scopa black; the dorsal segments, except the 

 first or second at sides, not fasciate ; abdomen most frequently with 

 narrow fasciae, sometimes interrupted medially, the pygidium large, 

 twice as broad as long, with a depression on the disk, the apical margin 

 subarcuate ; lateral angles of sixth segment acute. 



Vloiiumef list Cress. 



(i. .Malar space wanting, the eyes extending to the base of mandibles; 9 with 



the posterior orbits normal, not produced below into a tubercle behind 



base of mandibles; antenna? in %, shorter than the thorax or no 



longer 7. 



Malar space distinct, as long or a little longer than the pedicel, the eyes not 

 quite extending to base of mandibles; 9 with the posterior orbits 

 produced at base into an angle or tubercle, usually a little back of the 

 mandibles and between them and the eyes; clypeus in 9 deeply 

 emarginate anteriorly, and often armed with a horn, tooth or tubercle 

 on each side; % with the antenna longer than the thorax, the sixth 

 dorsal abdominal segment laterally and apical ly entire, not sinuate or 

 emarginate, the pygidium semi-circular or obtuse-triangular, entire or 

 at least never deeply emarginate at apex, at most with a very slight 



sinus < «t:i tosmia Thorns. 



7. Tibial spurs pale or rufous, never black or blue-black; abdomen most fre- 

 quently not metallic, very rarely distinctly metallic; ventral scopa in 

 9 white, rufous or fulvous, never black; % with the sixth dorsal 

 abdominal segment laterally sinuate, or emargiuate and frequently 

 with a lateral tooth, the pygidium at apex emarginate, bi- or tri-deu- 



tate, rarely entire 9. 



Tibial spurs black or blue-black; body metallic, or at least the abdomen is 

 metallic, black, blue-black or seneous black. 



Ventral scopa in 9 rufous or black only at apex 8. 



Ventral scopa in 9 white 8i. 



Ventral scopa in 9 black. 



