76 THOMAS SAY FOUNDATION 



ond, arista long, plumose to about the middle; bucca 

 one-fourth the eyeheight ; back of head with only black 

 hairs except around and below foramen; outer ver- 

 tical not differentiated. 



Thorax rather shining, but showing the usual 3-5 

 black stripes; anterior acrostichals numerous, about 5 

 medium-sized pairs ; prescutellars rather large ; 3 large 

 ps dc; 3 stpl; pleurae rather shining, in part rather 

 brown than black ; scutellum with the usual bristles,— 

 2 marginal, 1 subapical (small), 1 apical (metlium 

 and crossed). 



Abdomen subshining, black, but the hind margins 

 of the segments at the sides and beneath more or less 

 bordered with red, and the fourth always at least one 

 third red; first and second segments with only lateral 

 bristles; third with a median marginal pair widely 

 separated from the 3 or 4 marginals ; fourth with row 

 of about 14 marginal. 



Legs yellow, including cox^ but not the tarsi, the 

 latter almost black ; all the femora in most of the speci- 

 mens with a large dark spot on the front side near tip ; 

 middle femur with two rows of bristles beneath, hardly 

 forming combs distally; middle tibia with one small 

 and one large bristle on outer side near middle; liind 

 femur with very sparse villosity on both sides in front, 

 only a few hairs; pulvilli large, especially the front 

 ones; base of front tarsus with some longer hairs be- 

 neath. 



Wings rather smoky in color ; third and fifth cos- 

 tal segments about equal; costal spine distinct. 



Length, 6-8 mm. 



Four males: One Miami, Fla., Dec. 19, 1912, 

 on Persea flowers (collected by F. Knab, and belong- 

 ing to the National Museum) ; one with same label but 

 no data about the flower; one Tifton, Ga., Oct. 16, 

 1896, in the Hough collection; one from Crestview, 

 Fla., Oct. 15-16, 1914, in the collection of the Amer- 

 ican Museum of Natural History. 



Holotype.— Male, No. 20497, U. S. N. M.. the 

 first mentioned. 



