E. T. CRESSON, JR. 57 



Type. — cT ; Turrucarcs, Costa Rica, December 22, 1909, 

 (sweeping over mud), [Tj-pe No. 6129]. 



Another specimen belonging to this species was collected along 

 a ditch in Cartago, May 25. 



Discocerina nitida new species PL III, fig. 8. 



Black; antennae except apex above, sometimes facial orbits, knees, apices 

 of tibiae, and all tarsi, pale. Haltercs white. Wings hyaline with yellow 

 veins. 



Shining; upper surfaces sparingly dusted with brown, lower surfaces polished. 

 Face beneath antennae, narrow orbits, a narrow median stripe, and a sub- 

 lateral series of occasionally coalescing spots, silvery. Mesonotum with or 

 without greenish tinge. Abdomen black. Length. — 1.5 to 2 mm. 



Type. — cf ; Guapiles, Costa Rica, June 4, 1909, (creek in forest 

 south of town, 1100 ft. alt.), [Type Xo. 6130]. Paratypes.— 3 d^, 

 3 9 , topotypical. 



The species is also represented by seven specimens, collected 

 at: Filadelfia, January 18, on the muddy bank of Rio Tempisque, 

 and Juan Vinas, April 28, at a brook near woods. 



Discocerina nepos new species 



Similar to trilineata but larger, not so densely opaque on mesonotum and 

 frons. The latter above the antennae, and the parafacials more distinctly 

 yellowish; the latter extending above and differentiating the frontaha. Median 

 white facial stripes broader, but orbits very narrowly silvery. Prescutellar 

 bristles strong and supra-alars well developed. Knees and tibiae entirely 

 black. Third costal section nearly three times as long as second. Length. — 

 2.25 mm. 



Type. — 9 ; Southern slope of Irazu, near Cartago, Costa Rica, 

 5000 ft. alt., December 15, 1909, [Type No. 6131]. 



Discocerina trilineata new species 



Black; frons at antennae, antennae interiorly, parafacials, palpi, knees, 

 apices of tibiae, and tarsi except apices, pale. Halteres white. Wings hyaline 

 with yellow veins. 



Opaque; abdomen shining, or brownish pruinose on middle of dorsum; fem- 

 ora and tibiae shining. Frons yellowish brown with lower orbits narrowly 

 silvery; face with three conspicuous, longitudinal, median stripes and narrow 

 •orbits, densely silvery; occiputal area whitish. Mesonotum and scutellum 

 densely yellowish brown. Length. — 1.7 mm. 



Type. — cf ; Juan A'ifias, Costa Rica, April 28, 1910, (at brook 

 near wood, 2600 ft. alt.), [Type No. 6132]. Paraiypcs.— 1 d" , 

 1 9 ; topotypical. 



TRANS. AM. ENT. SOC, XLIV. 



