Vol. XXV] ENTOMOLOGICAL NEWS 353 



ventro-median line underneath the protecting sheath of the 8th stern- 

 ite is a median lobe directed ventrad, deeply divided medially to form 

 two cylindrical lobes which are densely clothed with long, appressed 

 silky hairs. Pleural region with the following appendages : a large 

 pale external appendage, directed dorsad in a position of rest, its tip 

 rather sharp-pointed, on its outer margin near the middle, with a 

 prominent chitinized tooth, the whole appendage clothed with long 

 pale hairs ; inner appendage smaller, flattened, fleshy, pale, clothed 

 with abundant pale hairs. Inside of the genital chamber, just beneath 

 the lobes of the gth tergite is a pair of irregular appendages very 

 densely provided with small, rounded chitinized tubercles. 



Holotype. — Male, Venezuela, ex. Coll. H. Fruhstorfer, in 

 the Hungarian National Museum. 



From the species of what seem to be Holorusia, pallidi- 

 nervis Mcqt. (Dipt. Exot., Suppl. I, p. i6) and albocostatd 

 Mcqt. (1. c, pp. 15, 16), this differs in its wing-pattern and 

 long pale yellow antennae. From H. may a Alex. (Ann. Ent. 

 Soc. Am., Vol. 5, p. 358, 1912) it differs in its much smaller 

 size and quite different color. 



Holorusia laevis, sp. n. (PI. XV, figs. 8, 15). 



Flagellum of antennae without bristles ; antennae of $ moderately 

 long, flagellum bicolored ; mesonotum reddish brown with indistinct 

 darker lines ; wings light brown, a square spot in cell M near the mid- 

 dle of its length. 



Male. — Length, 13.4 mm.; wing, 18 mm.; fore leg, femur, 11 mm.; 

 tibia, ii.S mm.; tarsus, segment I, 19 mm. 



Palpi moderate in length, dark brown; frontal prolongation of the 

 head rather short, nasus very long and prominent, front light brown ; 

 antennae moderately long, if bent back, extending a little beyond the 

 wing root, segment i rather short, about one-half as long as the third 

 segment, flagellar segments cylindrical, not constricted, unarmed with 

 bristles except a small pair at the tip, segments i and 2 light brown, 

 3 dark brown, 4 to 8 dark brown, yellowish at the tip, 9 to the end 

 dark brown, the entire flagellum densely covered with white downy 

 hairs; head rich brown. CSee Plate XV, fig. 15). 



Pronotal scutum reddish brown, scutellum almost white. Mesonotal 

 prjescutum reddish brown with very narrow indistinct darker lines ; 

 scutum reddish brown ; scutellum and postnotum pale yellowish white. 

 Pleurae uniform pale yellowish. Halteres rather long, brown. 



Legs, coxae and trochanters light yellow, femora light yellowish 

 brown, dark brown at the tip; tibiae brown, scarcely darker at the tip; 

 tarsi brown. 



