328 



diameter; apical joint of palpi barely longer than preceding joint. Disc 

 of mesonotum microscopically reticulated and with rather closely 

 placed short hairs. Legs slightly elongated, fore femora distinctly but 

 not greatly thicker than hind pair, their ventral surfaces with about 

 eight black spines extending from before middle to apex; fifth tarsal 

 joint with ventral spines ; tarsal claws of moderate length, those on 

 the hind legs distinctly longer than the others, each pair subequal in 

 length and with inner tooth. Third vein ending at about four fifths 

 the wing-length ; first ending slightly before middle of third ; media 

 forking close in front of cross vein ; cubitus forking below cross vein. 



Length, 3.5 mm. 



Type locality, Swarthmore, Pa., Ji-ine 8, 1905 (E. T. Cresson, Jr.). 



This species resembles some of those in Palpoyuiia in having ven- 

 tral bristles on the fifth tarsal joint, but there are no spines on the mid 

 and hind femora, which points to its closer association with Hctero- 

 myia, though the line of demarcation between these genera is rather an 

 arbitrary one as at present defined. 



The species is named in honor of the collector. 



5. Heteromyia tenuicornis, n. sp. 



Female. — Black, glossy. Head black ; fiagellum of antennae yel- 

 lowish on basal half, the apices of joints and the apical half fuscous, 

 scape black; palpi reddish. Mesonotum without trace of pruinescence ; 

 pronotum brownish. Abdomen brown, yellowish at base and ventrally. 

 Legs reddish yellow, mid and hind cox?e, knee joints, extreme apices 

 of hind tibise, and apical two tarsal joints blackened. Wings clear, 

 veins yellow. Halteres yellow, apically brownish. 



Eyes separated by less than one eighth the width of head ; antennae 

 slender, extending to about middle of abdomen, the basal eight flagellar 

 joints each about four times as long as their diameter ; apical joint of 

 palpi much longer than preceding joint. Disc of mesonotum with very 

 inconspicuous hairs. Abdomen much longer than head and thorax 

 together. Legs slender, fore femora distinctly but not greatly thicker 

 than hind pair, their ventral surfaces with 6-7 black spines on apical 

 half; hind tibia? with only weak decumbent hairs; basal joint of hind 

 tarsi about half as long as hind tibiae ; fifth tarsal joint unspined ; claws 

 short, subequal. Third vein ending at about five sixths the wing- 

 length; first ending at about two fifths the length from base of third; 

 cross vein at wing-middle ; media forking distinctly proximad of cross 

 vein ; cubitus forking below base of posterior branch of media. 

 Length, 3.5-4 mm. 

 Type locality, Polk Co., Wis., July (Baker). 



