AMERICAN DIPTERA. 253 



yellowish brown ; proboscis and legs yellow ; coxae, trochanters and tips of tarsi 

 black; wings hyaline; stigma pale grayish; marginal cell at tip of first vein 

 nearly twice as wide as the submarginal cell at that point. 5 mm. 



Maryland (Coquillett). 



Syiieche!^ pusillus Loew. 

 Cent., i, 25. 



Small, opaque, dark fuscous. Proboscis yellow. Antennae dark fuscous. 

 Abdomen black, opaque, posterior margins of the segments narrowly cinereous 

 pollinose. Legs pale yellow, varied with fuscous, in the lighter specimens the 

 basal half of all the femora, the apex of the posterior femora, a subapical ring on 

 the posterior tibiae, a middle ring and the last joint of the posterior tarsi fuscous 

 in color; in the darker specimens these markings are more diffused and nearly 

 black. Halteres dark fuscous, the pedicel lighter. Wings cinerascent immaculate. 



Illinois ; New York : St. Vincent, W. I. ; Wisconsin ; Kansas ; 



New Mexico. 



Syneclies debilis Coquillett. 

 Proc. Nat. Mus., 1895, p. 436. 



Antennae black, proboscis and palpi yellow. Thorax yellow, marked with 

 three vitlae and a lateral spot of yellowish brown. Abdomen and knob of halteres 

 black. Legs yellow, the last tarsal joints, apices of hind femora, middle of hind 

 tibiae and of their first tarsal joints black. Wings grayish hyaline, stigma pale 

 smoky brown, marginal cell at tip of first vein not wider than the submarginal 

 cell at the same point. 3.5 mm. 



District of Columbia ; Maryland : Georgia. 



Syiieches quadrangnlaris Wheeler et Melander (Fig. 85). 

 Biol. Cent. Am., 1901, Dipt. Suppl., p. 374. 



Fuscous. Antennse fuscous. Mouth parts yellowish. Mesonotum fuscous, 

 with faint indications of the lighter vittae, slightly tomentose. Halteres fuscous, 

 the pedicel lighter. Abdomen dark drown ; hypopygiura small. Legs, including 

 coxae, yellow; of the hind pair the femora, tibiae and metatarsi are apically 

 brown. Wings hyaline, with a single, well-limited, quadrate, dark brown stig- 

 mal spot at the apex of the first longitudinal vein ; marginal cell not widened at 

 the stigma; third vein not rigidly straight, veins brown. 2.5 mm. 



Tabasco, Mexico. 



Syneches rufiis Loew. 

 Cent., i, 24. 



Eufous, opaque; antennae, proboscis, palpi, halteres and legs concolorous; the 

 posterior tibiae often and the anterior and posterior femora sometimes fuscous. 

 Color of the abdomen tending towards fuscous. Wings subhyaline, costal cell 

 lutescent. second longitudinal vein meets the costa obliquely; beyond the end of 

 the first vein there is a black rounded spot. 4 mm. 



Illinois ; New York : Ohio ; Indiana ; Wisconsin. 



TKANS. AM. ENT. SOC, XXVIII. AUGUST, 1902. 



