314 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



the pleurite, bounded above by the lateral propodeal carina, and 

 di-awn out below into an apically-pointed lobe above the middle 

 coxa. The cephaUc lobe varies somewhat m relative width according 

 to the species, and its surface is smooth and sparsely punctured and 

 hauy, but it has been almost completely ignored m specific descrip- 

 tions, the references to punctuation and areolation concerning the 

 hinder lobe only. This lobe has the disk shining and sparsely punc- 

 tured and hairy, the whole margm more or less strongly crenulate, 

 and anj^vhere from the narrow lower margin to the lower two-thirds 

 of its surface roughened and irregularly areolate. The metasternum 

 is hidden by the enlarged hind coxae. 



The propodeum is nearly horizontal above, and usually gradually 

 rounded off behind, although sometimes the two faces meet in a 

 sharp angle, and the hinder face is even concave in some cases. 

 The dorsal surface is coarsely and more or less regularly areo- 

 lated, the main ridges consistmg of three longitudinal ones on 

 each side, the two median meeting before and behind, sometimes 

 curving together, sometimes forming a pair of elongate isoceles 

 triangles with the bases together, the form of the pair varying with 

 the species, and even somewhat in the species. The outer ridge on 

 each side forms a boundary between the metapleurum and the pro- 

 podeum. The ridge between the inner and outer ridges varies in its 

 relative distance from the two, and is connected with them by a vary- 

 ing number of more or less prominent transverse ridges, while the 

 two median ridges are usually joined by a number of prominent 

 transverse carinae. There is a decided tendency, particularly in the 

 males of some species, for the areolations to break dov^ai ahnost com- 

 pletely, and to leave a set of incomplete, twisted and curved, and 

 often indistinct ridges. The surface of the propodeum is usually 

 shining and hairy, at least on the sides, the hairs coming from obscure 

 punctures. The depressions between the ridges are often roughened 

 and irregularly wrinkled. The propodeal spiracle is large, oval, or 

 oblong, placed diagonally with reference to the median lino of the 

 body, and located between the second and tliird longitudinal ridges 

 on each side, usually in a shallow depression of the surface, although 

 the spiracle itself is quite prominent by reason of the strongly elevated 

 rim surrounding it. 



Wings. — The wings arc always darkened in the species of this genus 

 and are usually fuliginous, with a few lighter spots as follows: In the 

 forewings, with a lighter streak just behind the costal vein, and an- 

 other just in front of the anal vein, with a small uTcgular area just 

 behind the base of the stigma, and another beyond the pomt where 

 the disooidial and first recurrent veins branch apart. The dark 

 brown color of the veins is interrupted at the lower end of the trans- 

 verse medial vein (nervulus), above the middle of the first recurrent 



