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 9th 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. 16) and albocostata 

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

 long pale yellow antennae. From H. maya 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, n mm.; 

 tibia, 11.5 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. (See Plate XV, fig. 15). 



Pronotal scutum reddish brown, scutellum almost white. Mesonotal 

 pnescutum reddish brown with very narrow indistinct darker lines ; 

 scutum reddish brown ; scutellum and postnotum pale yellowish white. 

 Pleurae uniform pale yellowish. ITalteres 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. 



