J. R. xMALLOCII 33 



eral margins. Hypopygium very large, laterally with several strong bristles; 

 anal protuberance very long, its surface with numerous hairs, apical hairs 

 present. Legs strong, fore tarsi normal; posterior tibia with strong setulae, 

 almost equalling the tibial diameter. Costa to slightly short of wing middle ; 

 first costal division distinctly shorter than second; angle at apex of vein 1 

 not acute; fork of third vein very small, the enclosed space not broader than 

 the veins enclosing it; fourth vein slightly bent at base, and running almost 

 straight to wing margin, ending at slightly in front of wing tip; costal fringe 

 about 1| times the costal diameter. Length, 2.25 mm. 



Female. — Similar to the male except in the form of the abdomen. 



Holotype. — d", South slope of Irazd, near Cartago, 5000 feet 

 altitude, December 15, 1909. Type No. 6047. 

 Allotype. — 9 , same locality and data. 



Aphiochaeta pilosa new species (Fig. 4.) 



.Female. — Black-brown. Antennae and palpi brownish yellow. Legs 

 reddish yellow. Halteres yellowish. Wings clear, veins yellow, those on 

 disk of wing very pale. Bristles and hairs yellow. 



Frons with the suture indistinct; post-antennal bristles almost erect, 

 rather weak; first row of bristles as in previous species; surface hairs long; 

 third antennal joint globose, rather small; arista swollen at base, pubescent, 

 in length about equal to length of frons; palpi narrow, moderately bristled. 

 Mesonotum with the surface hairs of good length; pleura and scutellum in 

 poor condition. Abdomen narrow, surface with yellow hairs. Legs rather 

 long, fore tarsi thickened, throughout their entire length as wide as tibia; 

 hind tibia without any dorsal ridge or setulae, mid tibial spur weak, hind 

 tibia with apical spurs very minute; all legs with soft surface hairs. 

 Wing with costa to distinctly beyond middle, first division subequal with 

 second, angle at apex of vein 1 not acute; angle of fork very obtuse, almost 

 rectangular, the inner branch very thin and weak; fourth vein leaving at 

 fork with a distinct bend and running nearly straiglit to near wing tip; costa 

 very short and close haired (fig. 4). Length, l.iy mm. 



Holotype. — Alajuela, September 8, 1909, swept over brook, 

 3100 feet altitude. Type No. 6048. 



This species may really belong to the genus Becker ina, but from 

 its rather unsatisfactorj- condition I am unable to say definitely. 



Aphiochaeta rectangulata new species 



Female. — Yellow. Frons brown, surface poUinose; antennae reddish 

 yellow, palpi clear yellow. Mesonotum slightly shining reddish yellow; 

 pleura yellow. Abdomen brownish, the dorsum yellow. Legs j'^ellow. 

 Wings clear; veins brownish yellow. Halteres yellow. 



Frons with distinct central furrow; lower post-antennal about half the 

 size of the strong upper pair; center pair of bristles in first row distinctly 



TRANS. AM, ENT. SOC, XL. . ("S) 



