324 THE BLOWFLIES OF NortH AMERICA 
Wing hyaline, tinged with brown anteriorly and basally; basi- 
costa brownish black; subcostal sclerite orange brown with brown 
pubescence; costal spine distinct; costal sections 2 — 6 in the 
proportion 68 :37 :95 :42:5; fourth vein with obtuse bend toward 
apex; apical cell clearly open although sometimes rather nar- 
rowly so; squamal lobes white, the lower lobe often tinged with 
orange apically. 
Abdomen olivaceous to bluish green with whitish tessellated 
pollen; second, third, and fourth segments each with a row of 
marginal bristles, those on second segment only strong laterally; 
fourth segment with considerable black erect discal hair; ster- 
nites of nearly equal width. 
Genital segments black, shining, globose, with considerable, 
scattered black erect hair. Internal morphological features (pl. 
28, H and I) as illustrated. 
Female. Head height 10.4; eye height 6.3; bucca 0.54 eye 
height; length at antenna and at vibrissa 7.0; parafaciale op- 
posite lunule 2.4 in width; vibrissa set 2.4 apart; head width 
12.0; front at narrowest (at vertex) 0.34 head width, 0.48 at — 
lunule; the margins strongly diverging anteriorly; palpus 4.0 
in length. Wing with costal sections 2 to 6 in the proportion 
73 :45 :115 :52 :5. Legs with but one posterior bristle on fore tibia. 
Thorax without intrapostsupraalar bristle. Otherwise similar 
to male except for normal sexual differences. 
Length. 7-8 mm. 
Type. Male, No. 54985, U. S. National Museum. 
Type locality. Riverton, N. J. 
Biology, habits, and immature stages. Unknown. It seems 
probable that both this and the following species are parasites 
of earthworms, since species of this genus from the Palearctic 
and Australian regions have been found to be parasitic upon 
such hosts. 
The two males and five females comprising the type series were 
collected from June 9 to Aug. 15, 1921 and 1922, at Riverton, 
N. J., by T. H. Frison. A part of the series were reared ‘‘from 
meadow soil.’’ ; 
Onesia townsendi, new species 
Onesia aculeata Shannon (nee Pandellé), Insecutor Inscitiae 
Menstruus 11:108, 1923; Johnson, Boston Soc. Nat. Hist. 
Oceas. Papers 7(15) :217, 1925. 
A small blue black species with hyaline wings and with the 
general aspect of Calltphora. 
