E. T. CRESSON, JR. 
39 
Opaque. Frons, except orbits, dark brown or olivaceous, with stripes of 
black in certain aspects. Frontal and facial orbits white. Face light yellow 
with a well-defined median stripe extending from the carina to epistoma, brown. 
Cheeks and occiput whitish. Thorax gray, tinged with brown above. Mes- 
onotum with conspicuous median vitta bifurcated posteriorly, a posteriorly 
abbreviated dorso-central, an anteriorly abbreviated intra-alar and a broad 
lateral vitta, brown, a narrow notopleural stripe and a large mesopleural 
spot or stripe, and a low sternopleural stripe, brown. Scutellum with two 
brown dorsal spots and a black lateral margin. Abdomen gray, tinged with 
yellow, and with four series of large brown irregular spots, more or less coalesc- 
ing basally and the median pair generally attaining apices of segments. 
Frons slightly broader than long, with orbits slightly converging. Face 
much narrower, twice as long as broad, flat in profile; parafacials scarcely 
dilated below; bristles hair-like, short, about four in the series which is con- 
fined to lower third of face. Cheeks hardly as broad as third antennal joint. 
Antennal spine rather short; arista with ten to twelve hairs. Scutellum flat. 
Apical segment of abdomen of male shining. Middle femora of male ciliate; 
their tibiae minutely so. Wings long; second costal section nearly twice as 
long as third. Length. — 3.2 to 4 mm. 
Holotype. — cf ; Tabernilla, Canal Zone, Panama, April 27, 
1907, (A. Busck), [U. S. N. M. No. 20724]. Paratypes. — 2 cf, 
2 9 ; topotypical. 
Specimens Examined . — 7 cf, 7 9. 
Panama: Porto Bello, II, 15, 1911, (A. Busck), 1 9 , [U. S. N. M.]. Tab- 
ernilla, Canal Zone, IV, 27, 1907, (A. Busck), 3 c?, 2 9, [U. S. N. M.]. 
Brazil: Corumbd, (H. H. Smith), 1 9, [A. N. S. P.]. 
Paraguay: San Bernardino, II to III, 1906, (Babarczy), 4 cf, 3 9, 
[H. N. M.]. 
Variations. — The specimens from Brazil and Paraguay vary 
somewhat from the typical series. The wings are broader, with 
a decided yellowish tinge, and the second costal section is hardly 
one and one-half times as long as the third. In the Paraguay 
specimens the facial stripe is narrow and sometimes nearly obso- 
lete, but of the Brazil specimen it is normal, broad and distinct. 
The ciyierea-gv owp 
This group, although typically very distinct, is, however, not 
sharply defined. The essential characters are the strongly cili- 
ate middle femora and tibiae of the male. This ciliation, tj'pic- 
ally, is very distinct, of closely set bristles and hairs, which on 
the tibiae is of short, erect or suberect, more or less evenl}' ar- 
ranged hairs. The tibial ciliation is sometimes difficult to dis- 
TRANS. AM. ENT. SOC., XLIII. 
