20 Mr. P. Cameron on new Aculeate Flymenoptera 



doubt if the males of the two groups can be always distin- 

 guislied by characters which can be regarded as of generic 

 value. 



Geropales parva, sp. n. 



Nigra ; pedibus abdomineque rufis, orbitis oculorum lineaque pronoti 



pallide flavis ; alis hyalinis, apice fumatis. d . 

 Long. 4 mm. 



Hab. Ceylon {Yerhury). 



Antennae black ; the greater part of the scape briglit, and 

 the second and third joints below dark, red. Head smooth 

 and shining ; below the antennjB thickly covered witli silvery 

 pubescence ; the hinder ocelli are separated from each other 

 by the same distance they are from the eyes,. The inner 

 orbits to nearly opposite the lower ocellus are lined with 

 yellow ; the apex of the clypeus is reddish, the red projecting 

 upwards on the sides. Apex of mandibles rufous ; palpi 

 rufo-testaceous. Thorax black, smooth, and shining; the 

 pronotum behind broadly lined with pale yellow ; the edges of 

 the propleurffi behind are narrowly lined with yellow, and 

 there is, near the middle of the base, a yellow mark, tri- 

 angularly narrowed on the top. Median segment thickly 

 covered with silvery pubescence. Wings hyaline, infuscated 

 from the base of the radial cellule; the first and second 

 transverse cubital nervures are roundly curved ; the second is 

 straight and oblique ; the second cubital cellule on the top 

 is about one third the length of the first. Legs rufous ; 

 the tarsi infuscated. Abdomen rufous, darker towards the 

 apex. 



This is the smallest of the known Indian species. 



Sphegidae. 

 Tachytes inter stitialis^ sp. n. 



Nigra ; ore, antennis, abdomine pedibusquc rufis ; abdomine nigro 

 balteato ; alis hyalinis, apice fumatis, nervo 1° recurrente inter- 

 stitiali. § . 



Long. 15 mm. 



Uah. Ceylon [Yerhury^. 



Antennas rufous, thickly covered with a pale pile ; the 

 apical four joints black. Head black, thickly covered with 

 golden pubescence. Eyes large, strongly converging above, 

 where they are separated by the length of the fourth joint of 

 the antennae. The clypeus, labrum, and mandibles, except 

 the apical third, rufous ; the palpi are of a paler rufous 



