AMERICAN DIPTERA. 21 



Six females and four males from Kern Co., California (H. K. Morrison), 

 I refer unhesitatingly to this species. None of them have, however, 

 any red at base of the femora, but one from Northern California has, 

 the base of femora and tip of tibiae red. The color of the bristles 

 vary much, as they often do in this family. In none of my females 

 are there any black bristles above the border of the mouth. In 

 every female I find on the under side of the second joint of the an- 

 tennae two black bristles which arc less strong, and white in the male. 

 There are eight strong bristles on the females' ocellar tubercle, in five 

 specimens wholly black, in two partly whitish ; in all the males they are 

 less strong and whitish. In all my specimens, both male and female, the 

 fan-shape fringe of hairs in front ofi^the halteres is white. In four of 

 the specimens there are six bristles on the edge of the scutellum; in three 

 there are eight, in two ten, so that the number is not of specific value. 

 The spines on the tibiae of the male are white, in the female mostly 

 whitish, but in part black. My specimens are all larger (9-11 mm.) 

 than the ones described by Baron Osten Sacken, (7-7 2 mm,) neverthe- 

 less I believe the species is the same. 



31. liestomyia fraudiger n. gp. Plate II, fig. 5. 



% . — Head Itelow only gently oblique; face distinctly longer than the front from 

 ocellar tubercle to antennae, less gibbose on the lower part ; third joint of antennae 

 elongate, less distinctly clavate, gradually widened from near the base, not three 

 times as wide on its widest portion. Abdomen uniformly covered with whitish 

 gray pubescence, leaving a row of small lateral black spots on segments 3-6. Legs 

 red with broa<l black rings on femora and tibiae. Length 10 mm. 



Gray. Face and front whitish, the mystax, pile on the inner sides of the front 

 near the eyes and the bristles of the ocellar tubercle all nearly white, a single 

 black bristle on the second joint of the antennae. Antennae black, the first joint 

 somewhat j'ellowish at the base, the third joint begins to widen from very near 

 its base, the under surface is nearly straight, the nj)per side gently convex, except 

 near the base, the tip obtuse. Beard long and abundant, occipito-orbital bristles 

 chiefly yellowish. Dorsum of thorax yellowish gray with four bro%vnish stripes, 

 the middle ones narrowly separated, the lateral ones consisting of two oval spots, 

 the one before, the other behind the suture; there are four rows of rather stout 

 l)lack bristles nearly equidistant from each other, the lateral ones more irregular. 

 Scutellum in the single specimen with four black bristles. Pleurae wholly purely 

 grayish, the fan-like row of hairs in front of the halteres yellowish white. Abdo- 

 men wholly, and nearly uniformly whitish gray ; on each side of the third, fourth, 

 fifth and sixth segments near the front a small circular shining black spot; pile of 

 the hypopygium yellowish white. Coxae and legs red; front femora with a small 

 ring, middle with a broader, and hind pair except the base and tip, tibiae except 

 the broad base tip of hind pair broadly, and niiddle pair narrowly black; spines 

 of the legs white, of the tarsi chiefly black. Wings as in sabulonum, hyaline. 



One specimen, Mendocino Co., California (0. T. Baron). 



(6) 



