FRUIT FLIES OF GENUS TOMOPLAGIA — ACZEL 373 



Tomoplagia monostigma Hendel 



FiGUKEs 95,o-e; 97,i; Plate 20, figure 8 

 Tomoplagia monostigma Hendel, 1914, p. 38. 



This species of the obliqua group is very similar to cressoni, but may 

 be easily distinguished from the latter by the following comparative 

 characters: only the upper mesopleural bristle is present; the apical 

 brown spot is always absent on the scutellum; the black spot on the 

 inferior part of ventral pleurotergite is always more or less projecting 

 into the neighboring parts of the dorsal pleurotergite; and the second 

 abdominal tergite is spotless. 



Female: Length 3.5 (3.6) mm.; wing 4.0 (4.0) mm. long and 1.75 

 (1.66) mm. wide, 2.3 (2.5) times as long as wide. 



Head, including antennae and mouthparts, pale ochraceous yellow, 

 0.66 (0.57) mm. long, 1.11 (1.09) mm. wide, and 0.91 (0.93) mm. high. 

 Frons at vertex 0.50 (0.48), at anterior margin 0.32 (0.32) mm. wide, 

 and in median Ime 0.41 (0.41) mm. long. Oral margin of mesofacial 

 plate raised and as prominent as in cressoni. Postpedicel wide-oval, 

 0.22 (0.23) mm. long and 0.16 (0.16) mm. wide, 1.4 times as long as 

 wide. Seta bare, shining black, except the thickened basal fourth, 

 which is testaceous yellow, about 2.5 times as long as postpedicel. 

 Eyes in profile 1.7 times as long as wide. 



Head bristles as in cressoni. 



Thorax 1.6 (1.6) mm. long and 1.2 (1.1) mm. wide, pale ochraceous 

 yellow in ground color; mesonotum covered with brass-yellow dusting 

 and with very short appressed hairs, except the bare and shining 

 translucent hind margin; only a trace of three linear vittae, slightly 

 darker, present on mesonotum, as in cressoni. On the shining hind 

 part of mesonotum the pair of usual black spots, each one between 

 upper postalar and prescutellar bristles; one pair of pointlike small 

 dots, each beneath wing base. Pleura pale ochraceous yellow with 

 only one black spot on inferior part of ventral pleurotergite project- 

 ing, in all specimens examined, into the neighboring parts of the 

 dorsal pleurotergite. Scutellum shining translucent ochraceous or 

 whitish yellow, without small brown apical spot in all the specimens 

 examined; postscutellum and mediotergite as in cressoni. 



Thoracic bristles as in cressoni, but only upper pair of mesopleural 

 bristles present; dorsocentral pair placed in anterior fourth to third 

 of distance between suture and transverse line between supra-alars. 



Wing with very similar pattern to that of cressoni, ; but a more or 

 less short stretch of costa at apex of subcosta (distal to fracture) 

 blackish brown; anterior tip of humeral cross-vein dark to blackish 

 brown on both surfaces of wing, the brown often extends to the neigh- 

 boring parts of costa. Subcostal cell considerably narrower than in 



