72 PROCEEDINGS OF THE ACADEMY OF [Part I 



brown, the pleura faintly dusted with gray. Halteres pale brown, 

 the knobs darker brown. Legs with the coxae and trochanters 

 dark brown; remainder of the legs uniformly brown. Wings uni- 

 formly brownish gray; veins pale brown. Venation: Sc long, aSci 

 ending about opposite one-third the length of Ro+z] r on Es a little 

 more than its own length beyond the fork of R2+3; cell 1st M2 open 

 by the atrophy of the outer deflection of M^; basal deflection of 

 Cui immediately before the fork of M; 2nd Anal vein weakly bisinu- 

 ous. Abdomen dark brown; valves of the ovipositor long and 

 slender, acute; in the type, the tips of the tergal valves are decurved. 



Habitat.- — Peru. 



Holotype, 9 , Yurimaguas, March 23, 1920 (H. S. Parish). 

 Erioptera invariegata differs from the other species of Mesocyphona 

 with unmarked wings in the uniformly dark brown legs. 



Genus MOLOPHILUS Curtis 

 1833. Molophilus Curtis, Brit. Ent., p. 444. 



EUMOLOPHILUS subgen. n. 



Generally similar to Molophilus, differing as follows: The tibiae 

 and metatarsi of the hind legs in both sexes are adorned with con- 

 spicuous erect fringes of long, dark hairs that give to the legs a 

 fan-like appearance, Male hypopygium with a conspicuous lyri- 

 form plate. 



Type of the subgenus. — Molophilus (Eumolophilus) thaumastojiodus 

 Alexander (Brazil). 



This subgeneric group is proposed for two species of Amazonian 

 crane-flies that present a remarkable appearance, due to the con- 

 spicuous trichiation of the legs, especially the posterior tibiae and 

 metatarsi. The general appearance of the flies is not unlike that of 

 certain species of the Culicid genus Sahethes inhabiting this same 

 region. Although the general appearance of the two species referred 

 to this subgenus is very unlike typical Molophilus, the structural 

 details show the two groups to be closely allied. Besides the type 

 of the subgenus, the new species M. {E.) pennipes belongs to this 

 group. 



Molophilus (Eiunolophilus) pennipes sp. n. 



Male. — Length about 5 mm.; wing 4.5 mm.; hind leg, femur, 4.9 

 mm.; tibia 3.9 mm. 



Female. — Length about 5 mm., wing 4.8 mm.; hind leg, femur, 

 5.1 mm.; tibia 4.1 mm. 



Generally similar to M. (E.) thaumastopodus Alexander, differing 

 as follows: size much larger as shown by the measurements. An- 



