FUNGUS GNATS OF NORTH AMERICA. 281 



the third and fourth, yellow, the tip white ; face and palpi yel- 

 low. Thorax wholly blackish, bare, shining; pleura black, 

 each with yellow median spot; scutellum yellow; metathorax 

 shining black. Abdomen black ; genitalia yellow ; venter yellow, 

 blackish toward the base. Cox^ yellow, bare, at apex bipunc- 

 tate; femora yellow each with black spot at base, blackish 

 above; tibia yellow; tarsi fuscous; first joint yellow toward 

 the base. Wing iridescent; with preapical spot. The figure 

 shows the wing spot extending back into the base of the fork 

 of the media. 



"Tuxpango, near Orizaba, Mexico." 



3. Leia melcena Loew. 

 Berlin. Entomol. Zeitschr. XIII. 144. 1869. 

 Male. Length 3 mm; wing 3.8 mm. Black, shining, with 

 yellowish pile. Head black, face yellow ; palpi pale yellow, 

 antennee black, 3 basal joints yellow. Thorax black, humeral 

 triangle whitish. Abdomen black, pile yellow, hypopygium 

 black (Fig. 162), black pilose. Coxse and legs pale yellow, tip 

 of each posterior femur blackish, apical joints of hind tarsi 

 infuscated, hind tarsi a httle shorter than the tibiae. Wing 

 proportionately long, hyaline ; with wide preapical fascia which 

 is more dilute toward posterior margin ; a brown cloud behind 

 Cw (Fig. 194). Costa slightly produced beyond the tip of Rs. 

 Halteres yellow. 

 . "New York;" R. I., (J.B.). 



4. Leia nigra n. sp. 



Male. Length 4 m.m. Head shining black, face pruinose, 

 antennae black, scape and palpi yellow. Thorax shining black, 

 •faintly pruinose in oblique view, set^ black, fine h'airs yellowish. 

 Abdomen shining black, hairs yellowish ; intermediate ventral 

 sclerites narrowly margined with yellowish, hypopygium- black 

 (Fig. 163). Coxae, femora and tibial spurs yellow, tibiae and 

 metatarsi dusky yellow, remaining tarsal joints brown; setae 

 of tibiae and tarsi and of apex of coxae black. Wing white 

 hyaline, preapical fascia does not cover the basal half of cells 

 Ri and Mi (Fig. 195). Halteres yellow. Pullman, Wash., 

 (J.M.A.). 



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