PLATYPEZA. 225 



a. Posterior branch of prsebrachial vein not reaching the margin. 



b. Anterior branch almost straight. Species 1. 



b b. Anterior branch curved. Species 2-6. 

 a a. Posterior branch reaching the margin. Species 7-10. 



1. furcata, Fin. spl. 2. 4(1827); Mg. ; Mq. ; Ztt. Nigro-fusca, 

 alisfuscanis, vena subapicalis ramo antico subrecto, postico abbreviate. 

 Long. If ; alar. 4 lin. 



Dusky black. Head and thorax with a dull cinereous gloss in the 

 female. Antennae with the first two joints dull yellowish, darker in 

 the male, the third joint black, the arista placed rather towards its 

 upper edge, straight. Wings narrow, smoky-hyaline in the female ; more 

 dusky in the male, with the mediastinal areolet darker. Anterior branch 

 of the prabrachial vein almost straight, the other considerably abbreviated. 

 Discal and anal areolets distant from the hind margin, the terminal 

 portion of the pobrachial and anal veins being nearly twice the length 

 of the discal-transverse and subanal veins respectively. Halteres 

 blackish-brown with the base pale. Abdomen with the hinder seg- 

 ments from the fourth somewhat glossy ; in the male ending with an 

 incurved hypopygium (nearly as in Callomyia, but the forceps at the 

 tip small and indistinct). Legs dusky, paler in the female; tarsi 

 except the tip (and fore tibia? in the female) dull yellowish. Hind 

 tarsi nearly as in P. boletina, viz., the joints nearly equal in length 

 and the first three dilated in the male; third joint longest, fourth 

 also dilated with the external angle of the tip produced, in the female. 



Rare. In Mr. Halida/s collection. (I.) 



2. boletina, Fin. plat. 4. 1 (1815); Mg. ; Mq. ; Ztt. Cana, an- 

 tennis piceis, thoracis disco lurido, alls limpidis, abdomine pedibnsque 

 fulvis. Long. H ; alar. 4f lin. 



Hoary. Antennae piceous. Disc of the thorax lurid. Wings 

 colourless. Halteres, abdomen, and legs tawny. 

 Bare. In Mr. Stephens' s collection. (E.) 



3. fasciata, Fb. s. a. 271. 22 (1805); LI. ; Pz. ! fn. ciii. 20; 

 Fin. ; Mg. ; Mq. ; Ztt. Cana, antennis pedibusque piceis, alls lim- 

 pidis, abdomine basi fasciisque cants, tarsis fulvis. Long. 1^; alar. 5 lin. 



Fern. Hoary. Antennas piceous. Wings colourless. Halteres tawny, 

 with piceous knobs. Abdomen black at the base and along the fore bor- 

 der of each segment. Legs tawny ; femora and tibia? mostly piceous. 



Eare. In the collection of the Entomological Club. (E.) 



4. aterrima, Wlk. e. m. iii. 181 (1835). brunnipennis? Mq. 

 Atra, alis fuscis, pedibus nigris vel nigro-piceis. Long. If; alar. 5 lin. 



Male. Deep black. Wings dusky. Halteres and legs black or 

 dark piceous. 



Eare. In the collection of the Entomological Club. (E.) 



5. atra, Fin. plat. 6. 3 (1815); Mg. ; Mq. ; Ztt. Atra, alis lim- 

 pidis, pedibus piceis, tarsis fulvis. Long. 1^ ; alar. 4 lin. 



VOL. I. 2 G 



