523 



and dense hairs, the length of those on the apical half of basal joint 

 at least equal to the length of fourth joint, basal joint over two thirds 

 as long as fore tibiae (40: 55) ; mid and hind legs with long hairs. 

 Third vein ending beyond beginning of apical curve of wing, but dis- 

 tinctly in front of wing-apex ; distance from cross vein to apex of first 

 slightly exceeding distance from latter to apex of third; cross vein 

 (PI. XXXIX, Fig. 11) slightly sloping; cubitus forking below cross 

 vein. 



Length, 3.5-4.5 mm. 



Type locality, Urbana, 111., March 21, 1889, swarming about ever- 

 greens (John Marten). 



Female and early stages unknown. 



This species bears a strong resemblance to puhitarsis Zetterstedt, 

 which has been recorded from Greenland by Lundbeck. It differs 

 from the description of that species in having dark halteres, and the 

 basal joint of fore tarsi distinctly shorter than fore tibiae. Barbicor- 

 nis Linne is described as having the fore femora and tibiae with long 

 hairs and the fore tarsi short-haired. In pilipcs there are no long hairs 

 on the femora and tibiae, while the tarsal hairs are very long and dense. 

 Johannsen describes barbicornis as having long hairs on femora and 

 tibiae, and Schiner's description also leads one to infer that, contrary 

 to the general rule, the fore legs are uniformly hairy, which is not the 

 case in the species before me. In view of these facts I have no hesi- 

 tation in describing the species as new. 



3. Orthocladius flavoscutellatus, n. sp. 



Male. — Black, shining. Head brownish; antennae and their plumes 

 fuscous; palpi fuscous, yellowish at base. Thorax black, disc glossy, 

 areas between vittae slightly paler than vittae and with sparse pale prui- 

 nescence; upper central portion of pleurae brownish; scutellum yellow; 

 postnotum black. Abdomen brownish black, shining. Legs brown- 

 ish yellow, bases of femora and the trochanters clear yellow, femora 

 towards apices darker than other portions of legs. Wings clear, veins 

 pale. Halteres yellow. Thoracic and abdominal hairs yellow. 



Second joint of palpi with a prolongation at tip, which is about as 

 long as diameter of joint at insertion of third. Mesonotum with 

 rather sparse long hairs between the vittae. Hypopygium as in Figure 

 10, Plate XL. Legs slender, without long hairs ; basal joint of fore 

 tarsi very slightly exceeding half the length of fore tibiae (15:28) ; 

 empodium very weak. Third vein ending at beginning of apical curve 

 of wing, costa extending slightly beyond apex of third; distance from 

 apex of cross vein to apex of first subequal to that from apex of first 



