Al!T. M 



AJVIEWCAN MUSCOIl) FLIES — ALORICH 23 



j/uijuscula, the upper two or three pairs reclinaU', the following 

 .gradually becoming decussate, but there is no break in the series, 

 which extends just to the base of the second antennal joint. Anten- 

 nae brown, third joint slender, red at base, almost three times the 

 second, arista slender, a little enlarged at base, distinctly pubescent 

 on about the basal third. This pubescence is shorter than what I 

 have called short plumosity in majuscula. The narrow parafrontals 

 and still narrow^er parafacials are bare, with dull yellowish pollen 

 in the ancient type; palpi and labella yellow. 



Thorax black in ground color with dense yellow pollen, on which 

 two pairs of black stripes are distinct, the inner blending just at 

 the suture into a large heart-shaped ,spot not quite reaching the 

 scutellum, and showing a reddish brow^n color in an oblique view: 

 the outei- tapering abruptly to a point before the scutellum. Scutel- 

 lum opaque black, with yellow-pollinose border. Chaetotuxy: Acros- 

 tichal 1, 1 ; dorsocentral 2, 3 ; humeral 2 ; post-humeral 1 ; presutural 

 1: notopleural 2: supraalar 2; intraalar 3; postalar 2; sternopleural 

 1, 1; scutellum with H latcrsd pairs, a minute divergent a])ieal pair 

 hardly distinguishable from liairs. and a small subapical pair on 

 disk. Several distinct dark infrasquanial setules. 



Abdomen rather slender, dark yellow with a broad ill-defined 

 black median stripe; the second tergite is deformed in the specimen. 

 First segment with median marginnl pair of bristles: second with 

 liiscal and marginal pair.'^: third with discal pair and marginal row; 

 fourth with discal row and inegular marginal row^ partly double. 



Front legs rather dark yellow, including coxae, tarsi black; middle 

 femora yeUow on basal half, the rest blackish, their tibiae brown; 

 hind femora yellow on more than basal half, their tibiae brown, but 

 in the middle yelloAvish. The middle femora are densely ciliated 

 with dark yellowish pile on the anterior flexor side from about 

 the middle ;'the hind femora have similar cilia on both the anterior 

 and posterioj- flexor sides. The hind tibiae have rather deru^e and 

 long appressed hair on the flexor side at base. Claws and pulvilli 

 moderately elongated. 



Wings rather uniformly brown, deeper along the veins. Venation 

 as in 7najn8cula. 



FenifiJe.—X female in the United States National Museum (Higuito, 

 C\)sta Rica, collected by Pablo Schild) show> the following addi- 

 tional characters: Front 0.26 of head width at vertex and antennae, 

 but Avidening to 0.28 in the middle; pollen of head cinereous, not 

 yellow: arista with a little longer pubescence on basal third: inter- 

 mediate thoracic stripes hardly confluent behind suture; pollen of 

 thorax cinereous; posterior acrostichals 3, all but the hindmost small; 

 abdomen short and thick, keeled below^ ; the female genitalia ending in 



