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. 
Hab. India (Madras). 
10. FERREOLA UNICOLOR. B.M. 
Female. Length 63 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 ferrugmous ; 
head, antennz, legs, and three apical segments of the abdomen, 
black ; the scape of the antenne 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 mner tooth minute ; 
clypeus transverse, truncated anteriorly ; antennz 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 spose. Abdomen wider than the thorax, 
sessile, the base truncated, with the lateral angles rounded. 
1. MauriLtuus 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 antennz, which are placed in 
