1920] Melander: Near die Tetanocertdce 3011 



Heteromyza Fallen. 



Heteromyza Fallen, Dipt. Suec. Heteromyz, 2 (1820). Not Heteromyza of authors 

 (Helomyzidae) which is Heteromyiella Hendel, 1910. 

 Heterostoma Rondani, Prodr. Dipt.'ltal. I, 104 (1856). 

 Heterocheila Rondani, Prodr. Dipt. Ital. II, 13 (1857). 

 Oedoparea Loew, Zts. Entom. Breslau, XIII, 10 (1859). 

 Exocheila Rondani, Prodr. Dipt. Ital. VII, Sciomyz, 72 (1866). 



Black, only the halteres yellow; front, mesonotum and scutellum brown 

 pruinose, occiput, pleurae, abdomen and legs blue-gray; veins and margins 

 of calypteres black; 5 dorsocentrals; body and legs of male with long 

 black hairs; 6-7 mm. Alaska, Washington.* (Oedoparea) . . glauca Coquillett 



Helcomyza Curtis. 



Helcomyza Curtis, Brit. Ent. 68 (1825). 



Actora Meigen, Syst. Beschr. V, 403 (1826). 



Helcomyza mirabilis n. sp. 



Female — Length 7-11 mm. Face, cheeks and lower occiput thickly 

 overlaid with silvery white pollen, front convex and golden-olivaceous 

 pollinose, two rather small fronto-orbital bristles, antenna black, third 

 joint orbicular, arista short, bare and black, mouthparts black, head 

 with fine hairs which are short and proclinate on the front and out- 

 standing on the cheeks. Thorax thickly coated with pollen, olivaceous 

 gray on anterior mesonotum, usually purer gray about the scutellum, 

 vaguely marked with seal-brown vittae comprising a central pair stronger 

 at each end and a broader, shorter and darker lateral pair interrupted 

 along the transverse suture, most of the setulas arising from a brown 

 dot, pleurae cinereous, a velvet-black spot around the anterior spiracle; 

 chastotaxy as follows: 1 humeral, 2 notopleural, 1 presutural, 1 supra- 

 alar, 2 intra-alar, 3 dorsocentral, 2 prescutellar, 4 scutellar, pleural 

 except 1 pro-pleural and a superior row of 5 spemopleural bristles, 

 mesonotum and scutellum setulose, pleurae bare except for rather dense 

 and long outstanding fine black hairs covering the stemopleurae. 

 Abdomen cinereous, with fine black hair, seven segments visible. Legs 

 hairy, the femora piceous and cinereous pollinose, tibiae brown, tarsi 

 brown at base, apically black, front femora with six flexor hairs longer 

 than the rest, middle tibiae with about ten rather strong bristles 

 irregularly placed in addition to the usual preapical crown of bristles; 

 front and hind tibiae with single preapical bristle. Halteres and calyp- 

 teres yellow. Wings hyaline, veins fine and black, base of costal cell 

 and all crossveins margined with strong infumation, a brown spot 

 crossing the middle of the first basal cell, costal sections beyond humeral 

 vein proportioned 4 : 4 : 4 : 3 : 2, third and fourth veins drawn together 

 at anterior crossvein, which is located at five-ninths the length of the 

 discal cell, anal vein straight, ending under middle of discal cell. 



Male — 10-13 mm. Hairs of palpi, cheeks, body and legs much 

 longer, those of sternopleurac, abdomen and femora tipped with golden ; 

 1 dorsocentral, prescutellars reduced, propleura? of largest specimens. 



