SUBFAMILY CALLIPHORINAE 223 
about three and four rows respectively; segment 8 sometimes 
with a single irregular dorsal row but this usually absent for a 
short space; segment 12 very finely scabrous over entire dorsal 
surface, this area being smooth in the other species except 
illustris, which usually has a small, irregular, smooth area. 
Tubercles outlining stigmal field smaller and less conspicuous 
than in other species except pallescens, median pair on upper 
and inner pair on lower border of stigmal field less than half 
as large as others; tubercles on anal protuberance low, broadly 
rounded at tip. Posterior spiracles (pl. 39, D) rather small; 
peritreme wide and irregular, inner projections usually absent 
but there may be a short, pointed, pigmented projection between 
middle and lower slits. Cephaloskeleton (pl. 39, C) with dorsal 
and ventral cornua close together. Anterior spiracles with small 
short branches, the part external to cuticle approximately half 
the length of spiracular chamber; the number of branches in 52 
spiracles from two series of larvae examined ranging from 5 to 
7 (8 with 5 branches, 23 with 6, and 21 with 7.) 
Adult. Bufolucilia silvarum is not a common species in North 
America, but it may be found in woods and pasture land during 
midsummer. It is an active fly and occurs upon foilage in early 
morning or late afternoon. Adults are not often attracted to 
decaying meats in traps and are rarely collected upon decaying 
substanees. Parker (1918) trapped but a single individual in a 
privy vault trap at Laurel, Mont. 
The species may be collected from April to September in 
southern Ohio, becoming most abundant during June and July. 
In northern Virginia specimens have been taken during the last 
week in March and until October. In central California adults 
may be found as early as February. 
LUCILIA ROBINEAU-DESVOIDY 
Lucila Robineau-Desvoidy, Essai sur les Myodaires, Paris, p. 
452, 1830; Macquart, Soe. Sci. Arts Lille Mem. 1833 (— 
1834) :162; Schiner, Fauna Austriaca, Die Fliegen, vol. 1, p. 
589, 1862; Brauer and Bergenstamm, Zweifligler des Kaiser- 
lichen Museums zu Wien, vol. 4, no. 1, p. 89, 1899; ibid., vol. 
6, no. 3, p. 92, 1898; Hough, Ent. News 10:66, 1899; Zool. 
Bull. 2:287, 1899; Williston, Manual of North American 
Diptera, p. 3438, 1908; Townsend, Smithsn. Misc. Collect. 
51:118, 1908; Tothill, Ent. Soc. Amer. Ann. 6:241, 1913; 
Townsend, Ent. News 25:111, 1914; Shannon, Insecutor In- 
scitiae Menstruus 11:107, 1928; ibid. 12:72, 1924; Bezzi, Bull. 
Ent. Res. 17 :236, 1927; Curran, Amer. Mus. Nat. Hist. Bull. 
