7. PTIOLINA 315 



extends on to the moderately inflated lower part of the back of the head ; 

 upper part of the back of the head rather shallow and deep black, with a long 

 black postocular fringe ; vertex elevated, greyish black, and bearing moderate 

 black pubescence ; frons small, dull black, quite bare. Proboscis prominent, 

 dull black ; palpi pi-oduced and long, being nearly twice as long as the 

 proboscis and bearing rather long black bristly hairs, stout but hardly 

 in any way dilated about the tip unless they may appear slightly so 

 from some points of view. Eyes touching for less than half the distance 

 between the occiput and the antennas ; facets on about the lower third 

 obviously smaller than those on the upper part. Antenna (fig. 201) dull 

 black ; basal joint short and bearing numerous long black bristly hairs ; 

 second joint about as long as the basal one and also with conspicuous though 

 shorter bristly hairs ; third joint long ovate, Avith an almost apical style Avhich 

 is about as long as the third joint and sometimes appears to be jointed 

 because its basal half is stouter than its tapering apical half. 



Thorax black, slightly greyish, with a faint gloss in some lights; in front 

 there are two dull deeper black stripes with a narrow separating middle line, 

 and the intermediate spaces when viewed from behind give an impression of a 

 pair of blackish grey stripes ; humeri and postalar calli greyish black ; 

 pubescence long and abundant but not dense, of a rather bristly type and all 

 about equal ; pleura? bare, black with brownish grey dust especially on the 

 lower parts. Scutellum greyish black with similar pubescence to that on the 

 thorax. 



Abdomen black, rather shining ; pubescence long, black, equal, abundant 

 but not dense, and all of a rather bristly type. Belly rather more shining 

 black, and Avith similar but shorter pubescence. Genitalia blunt, rather 

 knobbed. 



Legs black ; femora and tibiae Avith rather long and rather abundant 

 pubescence composed of black rather bristly hairs which form a rather 

 long and conspicuous but not abundant dorsal ciliation on _ the anterior tibia? 

 and an unusually long dorsal ciliation on the hind tibise_; "touch-hairs" 

 just visible beneath the basal joint of the front tarsi. Pulvilli obscure pale 

 yellow. 



Wings Avith a decided blackish tinge: stigma greyish black, large and 

 long ; hrst and second veinlets from the discal cell sometimes emitted 

 separately or sometimes united for a short stem. iSquama? greyish black. 

 Avith obscurely greyish marginal hairs. Halteres broAvnish at the base, but 

 with large dull black knobs. 



9 . Frons (at its narrowest part) less than a half the Avidth of the head, ashy grey 

 (less broAvnish than in P. ohscura), Avith scattered short black bristles • face 

 and the broad side-cheeks ashy grey and quite bare; jowls moderately broad 

 and bearing rather long but rather sparse pale pubescence Avhich extends on 

 to the lower part of the back of the head, but on the upper half of the back 

 of the head the pubescence is 1 )lack, longer and more 1 jristly, and comes closer 

 to the eyes. Antenna? with the bristles on the tAVO basal joints rather short 

 though more abundant and longer than in P. ohscura ; third joint agreeing 

 with the male in being longer and less rounded than in P. ohscura. 



Thorax rather dark ashy grey with three broad broAvnish black stripes 

 which occupy nearly all the front part of the disc except in front of the 

 shortened side-stripes and down the narroAv intervals betAveen the stripes, 

 but these dark stripes die out Avell before the hindniargin ; the ashy grey 

 coloring about the sides gets a yellowish tinge in some lights especially about 

 the humeri ; pleura? ashy grey, quite bare. Pubescence of the thorax and 

 scutellum similar to that of the male. 



Abdomen blacker, with longer and nuich more conspicuous pubescence 

 than in P. obscura ; eight segments (Avithout the ovipositor) easily visible, the 

 second segment being the longest. 



Legs blackish ; hind tibia? distinctly ciliated dorsally and less so (but still 

 obviously) beneath ; " touch-hairs " barely visible. 



Wings less blackish than in the male, though Avith a more evenly blackish 

 tinge quite to the base. 



Length about 3-75 mm. 



