SYRPHIDAE OF MAINE. 171 



"P. perpallidus n. sp. Face scarcely at all produced; front tibiae of 

 the male gradually dilating from base to tip, front femora with moderate 

 pale pubescence behind ; abdomen and legs nearly all orange in both sexes, 

 "o*. Face and f rons obscured by yellowish grey dust, which leaves only 

 the central knob, the front mouth-edge, and the space above the antennae 

 shining black; the hairs on the face are fairly abundant, rather short and 

 mostly pale, but on the frons they are longer and partly black; the space 

 before the jowls is blackish; the jowls themselves and the back of the head 

 are yellowish grey, but more aenous towards the occiput; the pubescence 

 on these is luteous, becoming longer on the upper part, and nearly all black 

 on the raised shining aenous black vertex. Antennae entirely brownish 

 black ; arista dark orange to blackish, about as long as the antennae. 



"Thorax and scutellum intensely shining aenous with rather abundant 

 mostly equal tawny pubescence, which is however longer round the scu- 

 tellum, and longer and more shaggy on the back part of the mesopleurae ; 

 there are a few black hairs about the lowest part of the sternopleurae. 



"Abdomen all orange or tawny except at the black base which con- 

 verges about the middle of the second segment to a narrow dorsal line 

 which extends to the end of the fourth segment, while the hind-margins 

 of the second, third, fourth, and fifth segments are very narrowly and in- 

 conspicuously blackish (but not quite so narrowly in the specimen from 

 Kingussie). Pubescence nearly all yellow, and as usual longest about the 

 basal corners; belly all orange. Genitalia small, mostly shining aeneous 

 black. 



"Legs all orange except on the black coxae and trochanters, while the 

 hind tarsi are partly brownish on the moderately dilated basal joint and less 

 distinctly so on the two last joints; the hind femora and tibiae bear a 

 blackish ring about the middle in the specimen from Kingussie, and there 

 are faint traces of such ring in the Sutton Park specimens. Front tibiae 

 slowly and gradually dilated from soon after the base to the tip, which is 

 the widest part; this tip is rather whitened and is a little obscured; the 

 front tarsi are not so much widened as the tip of the tibiae and they very 

 gradually diminish in width, being dilated even up to the tip; the basal 

 joint is longer than the next two and more than twice as long as the second 

 joint. The pubescence behind the front femora is moderate and is all yel- 

 io'ic and inconspicuous, the long woolly white hair at the base behind being 

 present as usual in this group ; the front tibiae bear a slight fringe behind 

 about the middle. Middle trochanters bearing some strong black bristles, 

 while the middle femora bear a moderate pubescence which is nearly all 

 yellow and amongst which are no small black bristles, but towards the front 

 at the tip almost beneath are about five unusually long recurrent hairs, 

 which form a peculiar distinctive character for this species ; the tibiae are 

 slightly dilated about the middle and bear a long dense fringe in front al- 

 most beneath and a slighter fringe behind ; hind tibiae without any fringe ; 

 the tiny bristles on the legs are all yellow. 



"Wings considerably brownish, but rather tawny about the base and 



the stigma. Squamae and their fringes brownish yellow. Halteres orange. 



"?. Rather similar, but even the hind tarsi are almost all orange being 



