1893.) 



123 



b — Anterior tibia wholly with whitish hair ; posterior tibiffi with blackish hair 

 at the tips ; last three joints in the <? tarsi, and three or four in the ? 

 tarsi, black or grey; the preceding joints or joint with whitish hair 

 dorsally ; the sole often blackish. Fringe of the wing's apex whitish 

 from about the anterior branch of the radius to the anterior branch of 

 the pobrachial nervure. Superior $ appendages nearly as in P.fallax. 



Wing, 2-75 to 3 mm. long 12. P. gracilis, sp. nov. 



5— (la) Fringe of the wing more black than white, with a white patch at the pos- 

 terior margin between the postical and anal nervures ; that of the wmg's 

 apex whitish from about the posterior branch of the radius to just within 

 the pobrachial fork. Tibise with blackish hair at the tips ; last three 

 joints in the tarsus blackish-grey, the first two with a lighter gloss, or 

 impure whitish. Superior <? appendages nearly as in P.fallax. Wing, 



2 to 2-5 mm. long 13. P. hlandula,%^.T\oy. 



a — Fringe spaced in two places with white on the posterior margin, exterior to 

 the fold of deflection, in the mature fly ; the nearer patch sometimes 



absent in junior specimens "• 



6— (oa) Fringe of the posterior margin white between the postical and anal ner- 

 vures, and again for a very narrow space just on the inner side of the end 

 of the axillar nervure, three well-marked spaces remaining black, viz. :— 

 two black spaces between the fold of deflection and the end of the anal 

 nervure, and a third black space extending from the postical to the 

 anterior branch of the pobrachial nervure. Tibiae with blackish hair at 

 the tips ; last three joints in the tarsi blackish, the first two joints 

 glossed with impure whitish. Terminal joint in the superior $ append- 

 ages deflexed, dilated at the base ovoidally, and produced at the tip into 

 a long subulate point. Wing, 2-25 to 2-75 mm. long... 



14. P. trifasciata, Meigen. 



a — Fringe of the posterior margin white between the anal and axillar nervures, 

 and again for nearly an equal distance opposite the basal half of the 

 axillar nervure, leaving two well-marked spaces, and sometimes also one 

 or two narrow streaks, black, viz. :— a black streak close to the fold of 

 deflection; a space opposite the outer half of the axillar nervure; 

 another space extending from about the end of the anal to the posterior 

 branch of the pobrachial nervure ; and sometimes a streak of varying 

 breadth between the anterior branch of the pobrachial and the end of 

 the prtebrachial nervure. Tibise with blackish hair at the tips : last four 

 joints in the tarsus black, the 1st joint glossed with impure whitish. 

 Terminal joint in the superior <? appendages subulate, slightly curved, 

 subequal in length to the basal joint. Wing, 2 to 2-5 mm. long. .. 



15. P. pulchra, sp. nov. 



Species of the 3ed Section oe Pericoma . 



(Analytical Key, Steps ■4r^ 1). ^ i« ) 



1 "Wing pointed at, or very near, the end of the cubitus ; fringe dark, ex- 

 cepting about the wing's apex, and in one place on the posterior margin ; 



