J. R. MALLOCH 29 



Costa with distinct, thougli short, setulae; k'gs not particuhirlj- hairy, 



hind tibial setulae distinct rectangulata new species 



13. Black-brown species; hind tibial setulae very long, equalling at their 

 longest part the diameter of tibia exaltata new species 



Yellow species; hind tibial setulae generally very much shorter than 

 diameter of tibia lutea Meigen 



Aphiochaeta femoralis Enderlein 



1912. Aphiochaeta femoralis Enderlein, Ent. Zeit., 1912, 30. 



There are 3 specimens belonging to this species in the material 

 before me from the following localities: Alajuela, September 8, 

 1909, 3100 feet altitude, swept over brook; near Cartago, Decem- 

 ber 15, 1909, south slope of Irazu, over mud, 5000 feet altitude; 

 and Turrucares, December 22, 1909, swept over mud. 



To the description given by Enderlein I may add that the meso- 

 pleura are bare. 



Aphiochaeta littoralis new species 



MoZe.— Shining black. Frons glossy black, palpi yellow. Legs black- 

 brown, fore pair, including coxae, yellow, bases of mid and hind tibiae yel- 

 lowish. Wings yellow at base, veins brown. Halteres black. 



Lower pair of post-antennal bristles about three-fourths as large as upper 

 pair; first row of frontal bristles convex; antennae of average size; palpi 

 large, rather strongly bristled. Scutellum with 2 bristles; mesopleura bare. 

 Abdomen rather broad, soft haired; anal protuberance yellow, large. Legs 

 strong; fore tarsi slightly thickened; hind femur with 2-3 short bristles on 

 ventral' surface at apical third; hind tibial setulae (8-9) increasing in size 

 from base to near apex, the largest slightly shorter than tibial diameter. 

 Costa to beyond wing middle; first division shorter than second, the angle 

 formed by junction of first vein with costa acute; fork of third vein at an ob- 

 tuse angle; fourth vein leaving at beyond fork of third with a decided curve 

 and ending slightly recurved at in front of wing tip; costal fringe long, close 

 and rather shaggy. Length, 1.75 mm. 



Holotijpe.— & near San Isidro, August 21, 1909, sw(^pt near river. 

 Type No. 6041. 



Paratype. — Same data. 



Aphiochaeta polita Enderlein 



1912. Aphiochaeta polita Enderlein, Stett. Ent. Zeit., 1912, 30. 



There are 2 specimens referable to this species amongst the ma- 

 terial I have before me from Alajuela, September 8, 1909, swept 

 over brook, 3100 feet altitude. 



The mesopleura in this species are bare. 



TRANS. AM. ENT. SOC, XL. 



