26 Mr, P. Cameron on Ilymenoptera 



Colganta latiscutis, sp. n. 



E,ufo-fulvous ; tlie basal six joints of antennae coloured 

 like the body, the seventh to twelfth pale yellow, the apical 

 black ; tlie apical joint of the middle tarsi, the apical two of 

 the hinder as well as the base of the second and third joints 

 of the hind pair black. V/ings hyaline, highly iridescent, 

 suffused with brassy tints ; the costa and stigma dark testa- 

 ceous, the nervures black. Median segment closely rugosely 

 punctured-striated-reticulated ; the two basal keels are irre- 

 gular ; the basal abscissa weaker than the apical, its basal 

 part straight, the apical longer, weaker, and roundly curved 

 outwardly. Eye-orbits broadly pale yellow ; the front in the 

 middle closely rugosely punctured, raised, obliquely narrowed 

 to a point below. Temples almost obsolete, the eyes above 

 extending to the extreme edge, below they are abruptly 

 obliquely narrowed ; the margined edge of occiput is placed 

 low down below the top of the eyes. Pro- and mesopleuras 

 closely distinctly punctured. Scutelhun closely strongly 

 punctured, thickly covered with longish black hair ; the 

 lateral keels extend to the middle. Mandibles pale yellow, 

 the apex from shortly behind the teeth black. Centre of face 

 slightly raised, of equal thickness, not tuberculate above. 

 Scutellura broad, rounded at the apex, which has a longish, 

 steep, vertical slope. 



Length 17, terebra 3 mm. 



Sikkim. 



May be known from C. fidvijienms, Cam., by the middle 

 of the auteniue being clear yellow, the antennai being distinctly 

 three-coloured, by the temples being much less developed 

 above and more sharply oblique, by the shorter ovipositor, 

 and by the difference in the metanotal keels: in falvipennis 

 the inner keel is straight, the apical slightly rounded back- 

 wards in the middle and obliquely sloped ; there is a distinct 

 outer keel inside the spiracles, it having the basal two thirds 

 roundly curved inwardly, the lower third straight; in the 

 present species there is no outer keel and the inner is broadly 

 roundly curved. The difference in the form of the scutelhun 

 is well maiked ; in falvijjennis it is clearly longer than wide 

 and becomes distincily narrowed towards the apex, with a 

 gradual, short, not a vertical slope. 



AriiADNU.S, gen. nov. 

 Areolet entirely opoii at apex, the only transverse cubitus 



