SUBFAMILY CHRYSOMYINAE 197 
Cornell Univ., p. 826, 1928; McAtee, Wash. Ent. Soc. Proe. 
31 (6) :107-111, 1929; Johnson, Ent. Soc. Amer. Ann. 22: 
133, 1929; Johnson, Boston Soe. Nat. Hist. Bull. 59 :23, 1931; 
Whitehead, Jour. Eeon. Ent. 26:298, 1933; Johnson, Bird- 
banding 3:26, 1932. 
Male. Head (pl. 4, C) length at vibrissa and at antenna 7.0; 
eye height 8.7; head height, 12.0; head width 14.5; bucea 0.24 
eye height, buccal hairs black, abundant, of moderate length; 
frontale 0.72 frontal width; front at vertex 0.13 head width, 0.07 
at narrowest and 0.33 at lunule, with dull silvery or lead-colored 
pollen and a considerable number of scattered setae to below the 
middle of parafaciale; frontal bristles about 10, those toward ver- 
tex considerably weaker, the rows extending anteriorly only to 
base of second antennal segment and gradually diverging; para- 
faciale one-third elypeal width, of about equal width above and 
below, black, with slightly yellowish silvery pollen, and with 
scattered setae above but none immediately near eye; faciale 
bristled nearly halfway to antennal base with two or three rows 
of short setae; palpus 3.4 in length, yellow orange; third an- 
tennal segment 1.5 times as long as second, dark brown to black; 
arista with long cilia above and shorter cilia below, the plumosity 
extending four-fifths the distance to the apex; back of head 
with one well-defined row and two or three ill-defined rows of 
postocular cilia, and with abundant scattered whitish-yellow 
hair. 
Thorax blue black with metallic bluish-green areas in some 
lights, with thin gray pollen (except immediately behind head 
on pronotum where it is densely white or silvery), and with three 
to five black stripes which extend to slightly beyond suture; 
pleura lightly dusted with silvery pollen; propleuron with black 
or brownish-black setulae; preintraalar bristles three, the hind- 
most placed closer to the suture than the hindmost presupraalar 
bristle; preacrostichal bristles three, strong, the posterior bristle 
placed before the suture by 0.5; predorsocentral bristles three or 
four, the foremost weak and sometimes absent, the posterior 
bristle placed before the suture by 1.4; notopleural bristles two; 
preparapteron and greater ampulla with white pubescence; post- 
acrostichal bristles four, strong; postdorsocentral bristles four, 
the second weak, sometimes absent; mesothoraciec spiracle small, 
with yellow-brown hair; the anterior margin with or without 
long hair; scutellum with fine short white hair below. 
Legs black, middle femur with two anterior bristles near mid- 
dle, one or two (more often one) strong anteroventral bristles 
at basal fourth, and with a row of long thin posteroventral 
