130 



G. T. LYLE. 



truncate at apex (fig. 1, a), apical tubercle not prominent. Spurs of hind tibiae pale, 

 less than one-third as long as metatarsus. Terebra very short. Length, 3i-4 mm., 

 expanse, 7-8 mm. 



Type ? in the British Museum ; cotype in the Pusa Collection. 



Bihar & Orissa : Pusa, 1 ^, 2 $ and fragments of 2 others reared from Achaea 

 Janata. L., 20.ix.l912 [H. L. Dittt). 



Fig. 1 (a). Propodeon and first abdominal tergite of Microplitis eusirus, sp. n., Q ; in the pro- 

 podeon only the major reticulations are shown ; the point of view is at right angles to the 

 median carina, and the dorsal surface (unshaded) is seen considerably foreshortened ; only the 

 outline of the plate on the 1st tergite is indicated. 



{b). Rhogas [Heterogamus) percurrens, sp. n., Q ; detail of wing. 



(c). Heterogamus dispar, Curt., ^ ; detail of wing. 



(d). Heterogamus dispar, Curt., Q ; detail of wing. 



Genus Rhogas, Xees (1818). 



The following species is, formally at least, referable to Heterogamus, Wesm. 

 (1838), but the difference between the first and second abscissae of the radius is so 

 slight that the insect might with almost equal propriety be placed in Rhogas, Nees 

 (fig. 1, /;). The genotype of Heterogamus, Wesm. {H. dispar. Curt.) is a rare and 

 extremely distinct species, and quite possibly Heterogamus may be a valid genus ; but 

 if so, it is not yet properly understood and its real differentiae have not been fully 

 signalised. I have not had before me sufficient material of the genotype to satisfy 

 myself on this point, and for the present treat Heterogamus as a subgenus. It can 

 deserve no higher rank than this if its only criterion be the ratio between the first 

 and second radial abscissae. 



