32 PEOCEEDINGS OF THE NATIONAL MUSEUM vou G8 



LEUCOPHENGA UNIFASCIVENTRIS, new species 



Female. — Head, thorax and legs fulvous yellow, abdomen black, 

 with a broad fulvous yellow fascia covering second and third visible 

 tergites. Wings hyaline, marked as in figure 13. 



Postvertical bristles microscopic; orbital bristles long; cheek 

 linear. Wing venation as figure 13. 



Length, 2 mm. 



Type. — Higuito, San Mateo, Costa Rica (P. Schild). Cat. No. 

 284G9, U.S.N.M. 



Distinguished from any known American species by the unifas- 

 ciate abdomen. Several Oriental and Australian species have ab- 

 dominal markings like this one. 



LEUCOPHENGA ACUTIPENNIS, new species 



Female. — General color as in last species, the palpi and disk of 

 scutellum darker, abdomen marked as in figure 17, the outer black 

 spot on each side on the incurved lateral margin of tergite so that 

 it is not visible from above. Wings as in figure 14. 



Structurally similar to last species, the palpi but little dilated, 

 but the wings are quite acute at apices and the position of the outer 

 cross vein is different. 



Length, 3 mm. 



Type. — And one paratype, Higuito, San Mateo, Costa Rica (P. 

 Schild). Cat. No. 28470, U.S.N.M. 



LEUCOPHENGA TRIPUNCTIPENNIS, new species 



Female. — Similar to unifasciventris. First visible tergite yellow, 

 second with S large black spots, third with 5, the one on each lateral 

 margin invisible from above, fourth tergite with apparently 5 spots, 

 the median one linear, fifth with at least one on each side, but type 

 in poor condition to see details. Wings as in figure 15. 



Length, 3 mm. 



Type. — Higuito, San Mateo, Costa Rica (P. Schild). Cat No. 

 28471, U.S.N.M. 



LEUCOPHENGA ARGENTIVENTRIS Kahl 



In liis original description of this species Kahl states that the 

 " apical segments [of abdomen] show some blackish or dusky in the 

 specimen, but this may be caused by deterioration." In the specimen 

 before me there are five black spots on fourth and fifth tergites, 

 the outer one of each series on each tergite not visible from above. 

 The silvery wliite dusting on tliorax and abdomen, visible when the 

 specimen is viewed from in front, as well as the conspicuously 

 marked wings, which are somewhat similar to those of acutipennis^ 

 distinguish this species from its congeners. 



Locality. — Higuito, San Mateo, Costa Rica (P. Schild). 



