10 PEOCEEDINGS OP THE NATIONAL MUSEUM vol. 68 



CHAETOMINETTIA SPINITIBIA, new species 



Female. — Fulvous yellow. Parafacials with white pruinescence ; 

 frons entirely shining. Wings yellowish, both cross veins distinctly 

 but not conspicuously clouded. 



All frontal bristles except the ocellar pair strong, the latter very 

 small and weak, the postvertical pair as far behind ocelli as distance 

 of latter from eye, a few fine hairs on orbits; arista plumose; face 

 broadly convex; eye narrowed below. Thorax with three pairs of 

 strong dorsocentrals and one pair of presutural acrostichals ; intra- 

 alar weak; scutellum flat, apex transverse between bristles, the two 

 pairs of bristles equal. Bristles on apices of tergites of abdomen, 

 except on apical one, rather strong. Fore femur without antero- 

 ventral comb ; mid tibia with three or four posterior bristles. Inner 

 cross vein close to middle of discal cell; last section of fourth vein 

 but little longer than preceding section. 



Length, 5.5 mm. 



Type and 2 paratypes. — Higuito, San Mateo, Costa Rica (P. 

 Schild). Cat. No. 28145, U.S.N.M. 



Distinguished from the following species by the absence of con- 

 spicuous marks on the wings. 



CHAETOMINETTIA LATELIMBATA (Macquart) 



Differs from the preceding species in having the cross veins and 

 apices of veins 2, 3, and 4 conspicuously clouded with dark brown, 

 the clouds on apices of the longitudinal veins carried backward along 

 veins, that on fourth vein nearly connecting with the one on outer 

 cross vein, the one on second extending midway to apex of first vein, 

 and usually there is a fainter costal suffusion nearly to base of wing. 



Structurally and in chaetotaxy similar to spinifihia, but the outer 

 cross vein is noticeably beyond middle of discal cell. 



Length, 4-5 mm. 



Apparently a widely distributed species, the material before me 

 being from Trinidad, British West Indies; Panama Canal Zone; 

 Bahia, and Rio de Janiero, Brazil; Costa Rica; and Paraguay. 



It is probable that this species has been described under other, and 

 possibly earlier, names than the above, but I can not make certain 

 of this. 



In connection with this genus it is pertinent to state that there is 

 one species before me from Panama, which has the third vein bare 

 and bristles on the posterior side of mid tibia. In other respects it 

 appears to be a Minettia and is very similar to spinitibia described 

 above. 



The foregoing four genera are distinguished from all but three 

 or the previously described genera of the family in having one or 



