ORTHONEURA. 273 



joint of the antennas piceous, slightly increasing in breadth towards the 

 tip, which is obliquely truncated, rather broader and very much longer 

 than the iirst and second joints. Wings pale grey ; a large indefinite 

 pale brown spot extending from the stigma to the middle of the disc ; 

 stigma pale brown. Halteres tawny. Knees tawny ; anterior tarsi 

 tawny at the base. 



Generally distributed. (E. S. I.) 



13. interrupta, Hal. e. m. i. 165 (1833). Obscure aema, anten- 

 nis capite longioribus, alls limpidis, vena transversa apicis interrupta, 

 genubus ferrugineis. Long. 2 ; alar. 4 lin. 



" Half the size of the small variety of P. virens, which it resembles, 

 but the body is much less pubescent, and the front and face have only 

 a few very inconspicuous greyish hairs ; third joint of the antennae 

 more oblong than in that species." 



Rare. In Mr. Haliday's collection. (I.) 



Genus XX. ORTHONEURA. 



ORTHONEURA, Mq. d. n. (1827). Eristalis p., Fin. Chrysogaster p., 

 Mg. ; St. F. et Srv. ; Lw. 



Epistoma vix elongatum, ad os prominens. Antennae basi disjunct^, ca- 

 pitis latitudine conjunctim breviores ; articulus tertius linearis ; quar- 

 tus dorsalis ; quintus nudus. Scutellum depressum, ad marginem 

 acutum. Ala areola discali ab margine posteriore divaricata, areola 

 subapicali Integra, lobo axillari distincto, venis subcostali et radiali ad 

 marginem disjunctis, vena transversa prabrachiali ante areolce discalis 

 medium inserta. 



Body almost bare. Colour metallic. Head semicircular ; epistoma 

 but little elongated horizontally, protuberant towards the mouth. Anten- 

 na 5 -jointed, porrect, nutant, separated at the base, jointly shorter than 

 the breadth of the head, seated on a tubercle of the front ; first and * 

 second joints small ; third linear ; fourth seated on the back of the third ; 

 fifth setiform, bare. Scutellum fiat, with a sharp edge. Wings finely 

 pubescent, incumbent and parallel in repose ; discal areolet diverging 

 from the posterior margin ; subapical areolet entire ; axillary lobe distinct; 

 subcostal and radial veins ending separately in the margin ; transverse 

 prabrachial vein placed before the middle of the discal areolet. Abdomen 

 oblong, depressed. Legs slender. Male. Eyes contiguous. Fern. Eyes 

 remote. 



1. elegans, Wd.; Mg. zw. iii. 272. 14 (1822); Mq.; Lw. ; Ztt. 

 JEnea> antennis ferrugineis, alis subcinereis, genubus tarsisque fulvis. 

 Long. 2-t ; alar. 5 lin. 



Fern. yEneous. Vertex slightly transversely furrowed on each side. 



VOL. I. 2 N 



