MACROGASTER. CHREUSA. 31 



hind coxae externally above, their trochanters apically, and their 

 tarsi, black ; tibiae and tarsi shortly fulvous-pilose ; hind femora 

 strongly and closely punctate. Wings hyaline, with their apices 

 subinf umate ; feuestrae of second recurrent nervure distinct ; the 

 upper basal intercepts the median nervure beyond the lower basal ; 

 nervures and stigma black. 



Length 8-9 millim. 



ASSAM : Khasi Hills. 



Type in the British Museum. 



The extent of the black marking on the legs is variable, and the 

 hind femora are sometimes broadly black beneath. 



If this species is to be regarded as at all typical of the HEMI- 

 GASTRIDES, I have no hesitation in saying that that group should 

 be included in the AC^ENITIDES, since the type of M. luteus, which 

 was acquired by the British Museum in 1899, quite certainly 

 differs only specifically from my Accenitus xanthorius ; but since 

 Cameron himself, as stated above, was doubtful of the propriety 

 of including his Oriental species in this genus, it is impossible to 

 fix Brulle's genus without closer acquaintance with the typical 

 species (M. ritfipennis, Brul., Hist. Nat. Ins. Hym. iv, p. 185, 

 tab. xli, fig. 4, $ ) than I have had an opportunity of obtaining. 

 It is significant, perhaps, of an ignorance of that genus that 

 Brulle describes no species of Accenitus. 



Genus CHREUSA, Cam. 

 Chreusa, Cameron, Manch. Mem. 1899, p. 209. 



GENOTYPE, C. fulvipes, Cam. 



Wings with no areolet ; scutellum large, pyramidal and late- 

 rally broadly carinate ; metanotum with only the basal or central 

 area defined and laterally mucronate with large apophyses or a 

 plate. Eyes large and cheeks elongate ; vertical orbits hardly 

 developed, the internal distinctly margined next the scrobes. 

 Antennae incrassate, compressed towards the apex. Clypeus not 

 discrete, basally foveate on either side and apically rounded ; 

 mandibles triangular, with usually but a single apical tooth. 

 Thorax large, with indistinct notauli ; mesopleurae longitudinally 

 sulcate below. Basal abdominal segment large, with the post- 

 petiole dilated and the second with no gastrocoeli ; hypopygium 

 very large, emitting the terebra from its base. First joint of the 

 front tarsi basally strongly curved, subexcised, with the elongate 

 tibial calcar sinuate. 



Range. Assam. 



The form of the abdomen, with but three visible segments, 

 resembles that of Rothneyia ; and, indeed, Cameron at first pro- 

 posed to place it and the present genus in a new group of the 

 lOBHinrMOinNJB, under the name KOTBNEYINJE, but this has not 

 been accepted by systematists, since he himself placed the present 



