PLATYPEZA. 225 



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



b. Anterior branch almost straight. Species 1. 



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

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



1. furcata, Phi. sph 2. 4(1827); Mg.; Mq. ; Ztt. Ni(/ro-fusca, 

 alls fn&cnnh, vena subapicalis ramo antico subrecto, postico ahbreviato. 

 Ijon"-. 14 ; ahir. 4 lin. 



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

 female. Antennaj with the first two joints dvdl yellowish, darker in 

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

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

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

 of fJie prfpbrachial vein almost straujht, ^//e 0(^/'6'r 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 tibiae 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. Haliday's collection. (I.) 



2. boletina. Pin. plat. 4. 1 (181.5): Mg. ; Mq. ; Ztt. Cana, an- 

 tennis piceis, thoracis disco lurido, alis limpidis, ahdoniine pedibnsque 

 fnlvis. Long. 1^ ; alar. 4^ lin. 



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

 colourless. Halteres, abdomen, and legs tawny. 

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



3. fasciata, Pb. s. a. 271. 22 (180.5); LI. ; Pz. ! fn. ciii. 20; 

 Pin. ; Mg. ; Mq. ; Ztt. Cana, antennis pedibnsque piceis, alis Vnn- 

 pidis,abdomine basifasciisque cauis,tarsisfuhis. Long. \\; alar. 5 lin. 



Fem. Hoary. Antennae 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 tibite mostly piceous. 



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



4. aterrima, Wlk. e. m. iii. 181 (1835). — brunnipemiis'^ Mq. 

 Atra, alls fuscis, pedibus nigris vel niyro-piceis. Long. 1|-; alar. 5 lin. 



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

 dark piceous. 



Rare. In the collection of the Entomological Clnb. (E.) 



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

 pidis, pedibus piceis, tarsisfulvis. Long. \\ ; alar. 4 lin. 



VOL. I. 2 G 



