292 ME. AVALKER's CA.TALOGUE Or DIPTEEOUS IXSECTS 



Subfam. Oetalides, Jlalidaij. 



Gen. Lampeogastee, Mc(C(p 



81. Lamprogaster niarginifcra. Walk. See Vol. II. p. 111. 



Gen. Pteeogenia, Bigot. 



82. Pterogenia vittifinis, ii. s. Mas et Form. Nigra, lata, crassa, 

 capitc albiclo, facie maxima, arista subpliimosa, scutelli lateribus luteis, 

 femoribus crassis, tarsis flavescenti-albis, aiis albis costa basali lutea 

 fasciis duabus guttisque nigricantibus. Mas. Abdomine ovato. Fam. 

 Abdomine lanceolato vittis tribus luteis. 



Male and Female. Black, broad, tbick. Head whitish, black beneath 

 and with a black band on the front ; face very large. Antenna; black, 

 not more than half the length of the face ; arista minutely plumose, 

 more than tv.icc the length of the t3rd joint. Scutellum rather small, 

 not ascending, luteous along each side. Femora rather thick ; tarsi 

 yellowish white. Wings white, luteous along the costa towards the 

 base, with many blackish dots, some of which are confluent along the 

 hind border, and with two blackish bands, which are connected on the 

 hind border ; veins black; discal transverse vein straight, parted by one- 

 fourth of its length from the border, and by much more than its length 

 from the precbrachial transverse vein ; halteres whitish. Male. Ab- 

 domen oval, not longer than the thorax. Female. Abdomen lanceo- 

 late, shining, much longer than the thorax, with three luteous stripes. 

 Length of the body 3 lines ; of the wings 6 lines. 



83. Pterogenia vakiipennis, n. s. Mas. Nigra, nitens, lata, crassa, 

 capite albido fascia nigra, facie maxima, thorace vittis quatuor albidis, 

 abdomine brevi-couico, ])edibus fulvis, femoribus uigris, tarsis albis, 

 alis limpidis guttis plurimis transversis fuscis fascia obliqua abbre- 

 viata e guttis uigris, haltcribus luteis. 



Male. Black, shining, broad, thick. Head whitish, black beneath and 

 with a black band on the front ; face very large. Antennae black, 

 much less than half the length of the face ; arista simple, much more 

 than twice the length of the 3rd joint. Thorax with two whitish 

 stripes on each side ; scutellum whitish along each side. Abdomen 

 short-conical, shorter than the thorax. Legs tawny ; femora mostlv 

 black; tai-si white, with black tips. Wings limpid, with a luteous tinge 

 along the costa, with numerous transverse brown dots, and with an 

 oblique middle band which is abbreviated hiiidward, and is formed of 

 two separate lines of black dots ; veins black, luteous towards the base ; 

 discal transverse vein straight, upright, parted by hai-dly one-fourth of 

 its length from the border, and by very much more than its length 

 from the prscbrachial transverse vein ; halteres luteous. Length of 

 the body 3 lines ; of the wings 6 lines. 



