(306 Annals Entomological Society of America [Vol. VI, 



Originally described from District of Columbia (Osten 

 Sacken). Represented in U. S. National Museum collection 

 by 3 specimens, one from Monroe, Michigan, no other data; 

 one with the number 2464 — , and the third with label to the 

 effect that it was reared from wild rice {Zizania aqa^ntica) 

 August 8, 1891, District of Columbia, (T. Pergande). The 

 other records given by Coquillett for this species in Bull. 

 No. 10, n, ser. 1898, Dept Agric, Div. Ent. refer to fragaria 

 and maculosa. 



There is a male specimen in the U. S, National Museum 

 collection which represents probably a distinct species, but 

 its condition is not good enough to permit me deciding the 

 question, as the species of the group are all very closely allied. 



Locality: San Mateo County, California (C. F. Baker). 



31. Agromyza isolata, new species. 



Female: Frons black-brown; center stripe opaque, orbits shining; 

 breadth of frons a little over one-third the width of head; orbits slightly 

 differentiated from center stripe, and each about one-fourth as wide; 

 four long orbital bristles present, situated about on middle of orbits; 

 the short hairs sparse and in a short irregular row; ocellar region raised, 

 shining; ocellar triangle not distinguishable ; antennae black-brown; 

 second joint with numerous short, apical marginal hairs, and the dorsal 

 bristle distinct, third joint slightly longer than broad; the upper extrem- 

 ity less distinctly roimded than the lower, covered with rather distinctive 

 pile, which is brownish in color, and most distinct on dorsal surface 

 at apex; arista brown, the swelling at base short and glossy; pubescence 

 very short; length of arista equal to from its base to upper orbital 

 bristle; face brown-black, perpendicular, almost without a- central 

 keel; cheeks nearly linear, brown-black; marginal bristles in two rows 

 of moderate strength; vibrissa distinctly differentiated, the bristles 

 continued above level of vibrissa; eye apparently bare, about one and 

 one-half times as high as long; proboscis yellow; palpi black. Meso- 

 notum black, shining, but not glossy; four pairs of distinct dorso- 

 centrals present, the posterior pair most widely placed and strongest, 

 the anterior pair of moderate strength, distinctly longer than discal 

 setulse, and appreciably in front of suture; about 7 irregular rows of 

 setulas between the rows of dorso-centrals; the pair of bristles between 

 the posterior dorso-centrals as long as anterior dorso-central pair; 

 pleurse black-brown, glossy, narrowly paler along upper margin and 

 sutures, yellowish beneath wing base; squamas yellowish white, margin 

 and fringe brown; postnotum and scutellum concolorous with disk 

 of mesonotum. Abdomen ovate in shape, glossy black, apical segment 

 yellowish brown at apex, base of ovipositor longer than preceding 

 segment; hairs on ovipositor yellowish, on abdomen and thorax brown- 

 ish. Legs yellowish brown, the femora blackened; all legs with num- 



