CHALCID PARxVSITES OF AUSTRALIAN SHEEP MAGGOT-FLIES. 119 



1-2 mm. in length. All measurements given below refer to a 

 large form 1-8 mm. long. The wasp is easily recognised by its 

 sliiny-black upper surface and pale-brown under surface 

 (figs^l, 11). 



Head (fig. 13). — Height -6 mm. ; breadth -.5 mm. ; length 

 •32 mm. Depth of eyes about half that of head. Distance of 

 ventral portion of eyes to mouth twice that of dorsal part to 

 vertex. Head shiny black with very faint reticulate pattern ; 

 the numerous bristles generally lodged in small depressions. 

 Ocelli large and prominent, nearer to eyes than to one another. 

 Frons with a deep depression. Clypeus gently convex. In- 

 sertion of antennae on a level with lowest part of eyes, their 

 distance from one another equal to their distance from the 

 eyes. 



Eyes bare ; about fourteen bristles immediately around 

 orbit ; two vertical bristles in line A\ith posterior ocelli. Front 

 with about fifty other bristles. 



Mandibles shiny black, long (-216 mm.) and prominent, 

 tridentate, the anterior tooth very small ; the middle one 

 larger and prominent, the lowest somewhat smaller ; all very 

 obtuse (fig. 14). Mandibles provided Mith twelve bristles. 

 Maxilla short, foliaceous. covered with about twenty hairs 

 on upper surface. Palps pale brown, long and prominent, 

 last joint especially large. Submentum not prominent ; the 

 mentum somewhat triangular and provided with a row of short 

 bristles. Labial i)alps rather small, with three joints of which 

 the second is the smallest. ^lentum with prominent but short 

 ridges. 



Length of antennee -88 mm. ; maximum breadth 06 mm. 

 Ten joints including ring-joint. Scape slender, about -25 mm. 

 in length, shghtly broader at tip than at base, moderately 

 bristly, brown. Pedicel about one-third length of scape, very 

 conical. Ring-joint ver}?- indistinct, about 02 mm. long. 

 The following six joints very dark brown and heavily clad 

 with short bristles ; the proximal one oval, the others gradually 

 shortening, the most distal dome-shaped. Club 3-jointed. 

 •16 mm. in length (tig. 12). 



"Thorax." — Shiny black above, light brown below : 

 pronotum prominent, length about half that of head ; with 

 delicate transverse striations. Mesothorax about thrice the 

 length of pronotum ; as the anterior part of the pronotum 

 projects into the posterior concavity of head, and also is longer 

 at the sides than dorsally, the mesothorax appears, in dorsal 



