AMERICAN DIPTERA. 



25.- 



yellowish brown ; proboscis and legs yellow; coxse, 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). 



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

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

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



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



New Mexico. 



Syneches debilis Coquillett. 

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



Antenna; black, proboscis and palpi yellow. Thorax yellow, marked with 

 three vittaj 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 

 tibise 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 quaclrangularis Wheeler et Melander (Fig. 85). 

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



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

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

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

 coxa;, yellow; of the hind pair the femora, tibise and metatarsi are apically 

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

 mal spot at the apes 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 rufus Loew. 

 Cent., i, 24. 



Rufous, opaque; antenna, proboscis, palpi, halteres and legs concolorous; the 

 posterior tibia 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. 



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



