116 MR. V. WALKER ON NEW SPECIES OF DIPTEKA 



Subfam. Helomtzides, Fallen. 

 Gren. Helomyza, Fallen. 



40. Helomyza optatura. Fcem. Lutescens, capite albido, abdomine 

 maculis duabus latei'alibus subapicalibus apiceque nigris, alis limpidis 

 vitta costali exteriore maculam albam includente fasciaque nigris. 



Female. Pale luteous, smooth, shining. Head and thorax with stout 

 black bristles. Head whitish, excepting the vertex. Antennae less 

 than half the length of the face ; third joint elongate conical, about 

 twice the length of the second ; arista black, plumose. Abdomen ellip- 

 tical, shorter and narrower than the thorax ; hairs short, black ; a 

 black spot on each side near the tip, which is black. Wings limpid, 

 with a black stripe which begins at a little beyond one-third of the 

 length, extends to the tip, occupies more than half the breadth 

 from the costa, emits a broad band nearly to the hind border, 

 and includes a quadi'ate white costal spot ; veins black, pale luteous 

 towards the base ; discal transverse vein straight, parted by half 

 its length from the border, and by about its length from the prae- 

 brachial transverse vein. Length of the body 5 lines; of the wings 

 12 lines. 



41. Helomyza ortalioides. Mas. Nigra, capite albo, frontalibus 

 piceis, antennis fulvis, thorace vittis quinque scutello halteribusque 

 albis, abdominis segmentis albido marginatis, femoribus tibiisque 

 anticis tarsisque albidis, alis albis fasciis quatuor deviis nigris. 



Male. Black, smooth, shining. Head and thorax with stout black 

 bristles. Head white ; frontalia piceous, slightly tapering in front; 

 face transversely and slightly rugulose towards the epistoma. Pro- 

 boscis pale yellowish. Palpi tawny. Antennae tawny, nearly half 

 the length of the face; third joint slightly tapering, full twice the 

 length of the second ; arista black, plumose. Thorax with five white 

 stripes, one dorsal and four lateral; scutellum white. Abdomen 

 elliptical, shorter and narrower than the thorax ; hairs short, black ; 

 hind borders of the segments whitish. Tarsi, fore tibiae and fore 

 femora whitish, the latter blackish-shaded. Wings white, with four 

 irregular black bands ; first band narrow near the base ; second broad, 

 connected in the middle with the third, which emits a costal streak to 

 the tip ; fourth abbreviated in front, dilated, and connected with the 

 third hindward, emitting an exterior streak to the border ; veins black, 

 white at the base ; discal transverse vein nearly straight, parted by 

 less than one-third of its length from the border, and by much less 

 than its length from the praebrachial transverse vein; cubital and 

 praebrachial veins slightly undulating; halteres white. Length of the 

 body 4i lines ; of the wings 10 lines. 



This species appears to connect Helomyza witli Poticara. 



