June, I9 o 5 ] COQUILLETT : DlPTERA FROM NORTH AMERICA. 61 



Black, the first two joints of antenna,, face, halteres, first two pairs of cox* and 

 their femora except their apices, the apical half of their tibiae except the ex- 

 treme apices, all tarsi except the last two joints, and basal two thirds of the hind 

 femora yellow. Antenme longer than the body, the latter is highly polished, 

 and with a white pruinose vitta in middle of the pleura. Femora rather 

 slender the middle and hind ones with two or three spinous br.stles near the 

 apex of the under side ; first joint of front tarsi as long as the following three 

 together, on the middle and hind tarsi it is as long as the remaining joints, 

 fourth joint of hind tarsi slightly shorter than the third, about one half as long 

 as the fifth the latter not spined on the lower side, claws large, those of the 

 front tarsi 'equal in length, on the middle and hind tarsi one claw is nearly 

 twice as long as the other. Wings hyaline, a large spot extends the length of 

 the third vein, and from the costa nearly to the hind margin of the wing, also 

 a narrow border at apex of wing, blackish; third vein reaches five sixths 

 length of wing, apex of first vein slightly before middle of the third fourth 



vein forks rather far before the small crossvein. Length 3 mm nulnfer. - 



q. Mesonotum polished, or at least not gray pruinose ••••• ••••■ l0 



" Mesonotum opaque, gray pruinose and with a transverse row of four ■ tao« 

 pruinose spots near the middle and with another brown pruinose spot a short 

 distance in front of each of the outer spots. Black, the base of the antenna; 

 stems of halteres and the legs, yellow, the cox*, apices of first two pairs of 

 femora and of their tibise, the hind femora and their tibiae, also the ap.ces of 

 the joints of all the tarsi, dark brown, scutellum reddish brown. Pleura gray 

 pruinose, abdomen polished. Femora rather slender, the front ones slightly 

 thickened and spined on nearly the entire length of the under side, middle and 

 hind femora bearing three or four spines near apex of the under side ; first 

 ioint of tarsi longer than the following three, the last jomt ot hind tarsi 

 spined on the under side, claws large. Wings hyaline, third vein reaches 

 fi'e sixths length of wing, apex of first slightly before middle of thud, fourth 



forks slightly before the small crossvein. Length 4 mm slo: , 



10. Abdomen black It 



Abdomen chiefly yellow, tarsal claws equal ■■■ 



Blackish brown" the basal half of antenna,, the palpi, halteres, abdomen except 

 first two segments, and the legs, yellow, the coxa;, greater part of hind femora, 

 bases of middle and hind tibiae and apices of last joint of tarsi, dark brown. 

 Antennae reaching slightly beyond base of abdomen Mesonotum scabrous 

 Femora not spined, rather slender, the hind ones considerably thickened, first 

 tarsal joint as long as the remaining joints together, none of the pints spmed 

 claws rather large. Wings hyaline, third vein reaches five ixths length of 

 wing apex of first vein at middle of the third, fourth vein forks before the 



small crossvein. Length nearly 4 mm .^^^~~~^~>» s + 



-^-^n^TFloridaT A female specimemTollected by Mrs. A. T. Slosson. 

 Tvne No 8W U. S. National Museum. 



yP +M Washington, N. H. A female specimen, collected by Mrs. AT. Slos- 

 son, o whom this'fine species is named. Type No. 8358, U.S. National Museum. 

 ± Brownsville, Texas. A female specimen collected in May by Mr. C. H. T. 

 Townsend. Type No. 8 35 9. U. S. National Museum. 



11. 



