82 Mr. F. M. van der Wulp on 



basal joints of the antennae are rufous with only the third 

 joint blackish, but sometimes the basal joints are also 

 infuscated. The coloration of the abdomen is somewhat 

 variable, the black picture being more or less extended. 

 The male genitalia are swollen, shining black at the sides 

 and with brown hairs beneath. One of the females shows 

 at the tip of the abdomen some small black spines, which 

 in the others are inconspicuous in the pilosity. 



2. Saropogon incisuratus, n. sp. ^. 



Thorax grey with black stripes ; abdomen black with white 

 incisions ; mystax yellow ; legs yellow ; the tarsi, the hind tibiae, 

 and a spot on the hind femora, black ; wings subhyaline. 



Length 7.5 mm. 



Front black, with yellow dust ; face and mystax yellow ; occiput 

 dark grey with grey hairs. Antennse brown, on the inner side 

 somewhat lighter and more rufous, the tip and the rather distinct 

 terminal style black ; the basal joints of equal length, the third joint 

 one and a half times as long as the basal joints together ; the second 

 joint with black bristles at the tip on the underside. Proboscis 

 shining black ; palpi black with black bristles. Ground-colour of 

 the thorax yellowish-grey ; the thoracic dorsum covered with short 

 yellow hairs and with three broad blackish stripes, the median one 

 divided in two by a pale line ; pleurte black, with irregular yellowish 

 spots ; prothorax on the upper side with erect yellow hairs ; posterior 

 part of the thorax with yellow bristles, which are directed towards 

 the scutellum ; scutellum brownish-grey, with a narrow whitish 

 hind border and two pale yellow bristles ; metanotum grey, on each 

 side with a whitish spot ; the bristles before the halteres yellow. 

 Abdomen shining black ; the second, third and fourth segments with 

 a narrow white hind border ; genitalia rufous (in one specimen 

 black), with brown hairs on the underside. Coxjb black, the fore 

 and middle ones with a yellowish spot ; in the fore and middle pairs 

 of legs the femora and tibiae are pale yellow, the tarsi rufous-brown, 

 lighter towards the base ; in the hind pair the femora are yellow 

 with the tip and a large spot on the upperside black, the tibiae and 

 tarsi black, the end of the tibia? and the first tarsal joint often 

 somewhat rufous ; the spur at the end of the fore tibi;e minute, 

 ending in a black spine ; bristles of the fore and middle tibiae yellow 

 and black mixed ; those of the hind tibite all black ; bristles of the 

 tarsi and likewise the foot-claws black. Halteres yellow. Wings 

 (Plate II, fig. 1) greyish-hyaline, slightly infuscated at the tip ; 

 £mall cross-vein on the middle or a little beyond the middle of the 



