FRUIT FLIES OF GENUS TOMOPLAGIA — ACZEL 405 



Observation: In all specimens examined the fourth longitudinal 

 vein (Ml) is loosely setulose from the base only to the inner cross-vein 

 (to) on both surfaces of the wing. 



Tomoplagia trivittata (Lutz and Lima) 



Figure 96,d,e; 97,e; Plate 21, figure 11 



Plagiotoma trivittata Lutz and Lima, 1914, p. 10. 

 Tomoplagia trivittata (Lutz and Lima), Lima, 1934, p. 118. 



The writer has two specimens of this well-defined species of the 

 pleuralis group, originally described from BrazU, which differs from 

 its allies by having two testaceous yellow vittae on the frons as well 

 as by other characters. The Argentine specimen differs slightly from 

 the Brazilian, e. g., the Argentine specimen has the same wing pattern 

 as figured by Costa Lima (1934, pi. 1, fig. 3) and nearly parallel 

 vittae on the frons; the Brazilian specimen is larger in size, its wing 

 pattern is slightly different, and the testaceous yellow vittae are 

 more converging towards anterior margin of the frons, forming a 

 V-shaped marking. It will be necessary to study more specimens, 

 especially reared material, in order to settle the status of the Brazilian 

 male specimen described here. This may represent a variety or a 

 subspecies. 



Male: Length 5.5 mm.; wing 5.7 mm. long and 2.6 mm. wide, 

 2.2 times as long as wide. 



Head pale ochraceous yellow, 1.02 mm. long, 1.68 mm. wide, and 

 1.43 mm. high. Frons at vertex 0.73 and at anterior margin 0.59 

 mm. wide, and in median line 0.66 mm. long, wider at vertex than 

 long, with a testaceous yellow V-shaped marking on frontal vitta; 

 ocellar, genovertical, parafacial and mesofacial plates, and a wedge- 

 shaped longitudinal stripe on middle of frontal vitta (in front of ocelli) 

 densely covered with whitish dusting. Oral margin of mesofacial 

 plate raised and prominent. Antennae and mouthparts testaceous 

 yellow, except the yellowish brown labellae; postpedicel 0.27 mm. 

 long and 0.20 mm. wide, 1.3 times as long as wide, with bare shining 

 black seta (only basal seventh testaceous yellow), three times as long 

 as the postpedicel. Eyes, in profile, very high, 2.1 times as high as 

 wide, very sparsely beset with tiny hairs, erect and whitish. 



The brownish yellow head bristles somewhat flattened; three pairs 

 of incurved lower orbital bristles, anterior pair slightly shorter; two 

 pairs of recurved upper orbital bristles longer and stronger than lower 

 orbitals, posterior pair about as long as the divergent outer vertical 

 and anterior pair hardly shorter than the slightly divergent ocellar 

 bristles; the hardly convergent inner verticals the longest and strongest 

 of all. One pair of distinct genal bristles present, darker than the 

 others. 



