8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 9a 



33. Apical scutellars directed backward 14 



Apical scutellars directed upward (female only). 



13. marginata Aldrich and Webber (p. 24) 



14 Discal scutellars strong 15 



Discal scutellars, if noticeable, weak, hardly distinguishable from the sur- 

 rounding hairs 14. fulgoris, new species (p. 24) 



1(3. Frontal orbit brownish gold, face and gena silver-pollinose ; venter of ab- 

 domen gray (female only) 15. taglinoi, new species (p. 25) 



Frontal orbit and face golden-pollinose, facial depression less golden-pol- 

 linose; venter of abdomen gray on segments 1, 2, and 3. fourth golden; 

 male lackiuk an inner ventral bristle K>. viridis (Townsend) (p. 26) 



16. Frontal orbit and face golden-pollinose, often facial depression and gena 



more silvery 18 



Frontal orbit golden-pollinose ; face, gena, and posterior orbit silvery gray 17 



17. Parafacial normal, not noticeably broad. 17. lineata (Van der Wulp) (p. 27) 

 Parafacial very broad, nearly as wide as distance between facial ridges 



(male only) 18. facialis, new species (p. 28) 



18. Abdomen with discal and marginal rows of macrochaetae on fourth segment 



(male pulvilli long) 19 



Abdomen with fourth segment covered with irregularly placed bristles; no 

 abdominal vitta ; apical scutellars weak, turned up; one very strong inner 

 ventral bristle on midtibia ; front more than one-third bead width; pen- 

 ultimate joint of arista elongate; palpus yellow, infuscated at base; pul- 

 villi small (male only) Chrysophryxe tibialis, new species (p. 106) 



19. Second and third abdominal segments with apical one-fourth to one-third 



black and free from pollen 20 



Second and third abdominal segments with narrow apical margin not dis- 

 tinct, tending to blend with pollen ; male lacking inner ventral bristle 



19. dawsoni, new species (p. 29) 



20. Frontal orbit and face golden, facial depression more silvery pollinose 



(male only) 20. angustifrons (Townsend) (p. 30) 



Frontal orbit and face golden-pollinose. 



21. ochracrea (Van der Wulp) (p. 30) 



1. ZENILLIA LIBATRIX (Panzer) (genotype) 



[The complete synonymy is so voluminous that many of the early references are 

 not cited here. The reader is referred to Bezzi and Stein and to Lundbeck 

 for a more complete record.] 



Musca Matrix Panzer, Fauna insectorum Germaniae initia, pt. 54, p. 12, 1798. 



Tachina Itbatrix (Panzer) Meigen, Systematische Beschreibung der europiiis- 

 chen zweifliigeligen Insecten, vol. 4, pp. 400, 281, 1824. 



Zenillia libatrix (Panzer) Kobineau-Desvoidy, Mem. Acad. Sci, Inst. France, vol. 



2, p. 152, 1830. — Bezzi and Stein, Katalog der palaarktisehen Diptereu, vol. 



3, p. 278, 1907.— Townsend, U. S. Dept. Agr., Bur. Ent, Tech. Bull. 12, pt. 6, 

 p. 100, 1908 ; Manual of myiology, pt. 4, p. 231, 1936— Coquillett, Proc. U. S. 

 Nat. Mus., vol. 37, p. 621, 1910 — Howard and Fiske, U. S. Dept. Agr., Bur. 

 Ent., Bull. 91, pp. 88, 90, 91, 136, 302, 303, 310, 1911.— Baek, Zeitschr. Angew. 

 Ent., vol. 7, p. 153 (119), 1921— Aldrich and Webber, Proc. U. S. Nat. Mus., 

 vol. 63, art. 17, pp. 7, 9, 1924.— Lundbeck, Diptera Danica, pt. 7, p. 338, 

 1927.— Burgess and Grossman, U. S. Dept. Agr. Tech. Bull. 86, p. 115, 

 1929.— Brown, U. S. Dept. Agr. Circ. 176, p. 15, 1931.— Dowden, Journ. Agr. 

 Res., vol. 48, pp. 97-114, 1934. 



