IPHIAULAX AND CHAOLTA. 51 



Antennae black ; the scape not quite 3 times longer than 

 broad, the apex toothed at the sides below. Face with a 

 clearly defined semicircular depression over the mouth ; cover- 

 ed with pale hair. Front and vertex smooth and shining ; the 

 temples broad, not much narrowed, rounded behind ; the 

 occiput transverse. Frontal plate smooth, longer than the 

 width at the base ; the apex rounded ; but not broadly, a 

 furrow leads in to it from between the base of the antennae, 

 in the centre of which is a keel, which reaches close to the 

 apex of the plate, becoming thicker as it does so. Mesonotum, 

 scutellum and metanotum flat, on one level ; scutellum roundly 

 narrowed to the apex. Metanotum and mesosternum blackish. 

 Middle lobe of 1st abdominal segment of equal width ; stoutly 

 longitudinally striated, the inner side of the sides more finely 

 and closely striated ; the 2nd to 4th segments closely rugosely 

 punctured and striated ; the keel on the 2nd segment reaches 

 to the base of the apical fourth ; it becomes gradually narrow- 

 ed to a fine point, is closely longitudinally striated and is 

 bordered laterally by a crenulated furrow ; the oblique furrows 

 on the 2nd, 3rd and 4th segments are straight, oblique and 

 stoutly striated ; the suturiform articulation is crenulated ; 

 the 2nd furrow is deep narrow and smooth. Wings yellowish 

 hyaline to near the transverse basal and to the transverse 

 median nervures ; the 1st cubital cellule has a hyaline cloud 

 which bifurcates near the middle, the lower branch being the 

 longer, reaching to toe apex of the cellule, below which is a 

 smaller cloud projecting backwards from it ; the 3rd abscissa 

 of the radius is as long as the basal two united. Fore tarsi 

 twice the length of tibiae which are hardly the length of the 

 basal two joints united. 



R. A. Soc, No. 42, 1904. 



