170 HYMENOPTERA. 



Male. Resembles the female, but has the prothorax propor- 

 tionably longer, nearly equal to the length of the meso- and 

 meta-thorax ; the abdomen has the basal half of its segments 

 covered with a grey or silvery pile, the apical half with violet. 



Hob. India (Madras). 



10. FERREOLA UNICOLOR. B.M. 



Female. Length 6^ lines. Black : prothorax twice the length 

 of the mesothorax; the metathorax truncate posteriorly and 

 slightly excavated ; wings dark fuscous, the third submarginal 

 cell much narrowed towards the marginal ; the legs spinose. 

 Abdomen sessile, and having, as well as the thorax, an obscure 

 violet bloom or pile. 



Hab. South America (Napo River). 



11. FERREOLA SANGUINEA. B.M. 



Female. Length 9 lines. Thorax and abdomen ferruginous ; 

 head, antennae, legs, and three apical segments of the abdomen, 

 black ; the scape of the antennae ferruginous beneath ; wings 

 dark fuscous, the third submarginal cell narrowed towards the 

 marginal, of the same width as the second submarginal ; the legs 

 spinose. 



Hab. Georgia. 



Genus 4. MAURILLUS. 



Head quadrate, wider than the thorax; eyes elongate -ovate ; 

 mandibles short, stout and bidentate, the inner tooth minute; 

 clypeus transverse, truncated anteriorly ; antennae short and con- 

 volute ; the scape short, very thick, and obliquely truncate at 

 the apex; ocelli three, placed forward on the vertex. Thorax 

 oblong, its sides parallel, rounded anteriorly and truncated pos- 

 teriorly ; the anterior wings having one marginal and three sub- 

 marginal cells, the second and third of equal width, the former 

 receiving the first recurrent nervure a little beyond the middle ; 

 the legs short and spinose. Abdomen wider than the thorax, 

 sessile, the base truncated, with the lateral angles rounded. 



1. MAURILLUS AUSTRALIS. B.M. 



Female. Length 9 lines. Black : head quadrate, the vertex 

 densely clothed with golden pubescence ; a smooth shining naked 

 space above the insertion of the antennae, which are placed in 



