20. 
21. 
22. 
23. 
24. 
25. 
26. 
27. 
28. 
29. 
30. 
al. 
32. 
33. 
34. 
35. 
TELOTHYRIA. 
Thorax whitish-grey, without stripes . 
Thorax blackish or cinereous, with more or less distinct stripes . 
Wings with a small costal spine 
Wings without a costal spine 
Thorax black, only anteriorly with some grey tomentum and 
obsolete stripes 
Thorax greyish, cinereous, or ochraceous, with distinct black 
stripes . 
Palpi black 
Palpi rufous, or at least with a rufous tip 
Abdomen (3) laterally yellowish and somewhat transparent . 
Abdomen without yellow coloration 
Head ochraceous or yellowish 
Head grey or whitish . oe 
Abdomen cinereous with black markings 
Abdomen blackish with grey reflections . 
White front borders of the abdominal segments very narrow and 
little conspicuous 
White front borders of the abdominal ‘segments broad and 
distinct . 
Thoracic stripes unequal (the intermediate stripes linear, the 
outer ones much broader) . 
Thoracic stripes linear, the outer ones scarcely broader . 
Abdomen conical, the ventral side carinated 
Abdomen ovate, not carinated . 
Fourth section of the costal vein (between the end of the first 
and that of the second vein) as long as the third section (be- 
tween the end of the auxiliary and that of the first vein) 
Fourth section of the costal vein longer than the third section. 
Thorax light grey, with indistinct black lines; dorsal macro- 
cheetze on the hind margins of the third and anal segments . 
Thorax cinereous, with distinct black stripes; 
cheetz only on the anal segment 
Apical cell broadly opened ; small cross-vein “oblique, before 
the middle of the mediastinal cell 
Apical cell narrowly opened ; small cross-vein perpendicular, 
under the middle of the mediastinal cell . 
Frontal bristles inserted close to the inner orbits of the eyes ; 
frontal band absent . 
Frontal bristles inserted as usual close to the frontal band, 
which is always present 
Palpi black 
Palpi rufous . . . . 
Abdomen carinated on the ventr al side . 
Abdomen not carinated 
BIOL. CENTR.-AMER., Dipt., Vol. IL., Tune 1890. 
dorsal macro- 
169 
lugens, v.d. Wulp. / 77 
21. . 
costalis, vy. d. Wulp. | 7 
22. 
Doe 
rava,v.d. Wulp. / /% 
23. 
striolata, v. d. Wulp. 174 
24. 
fasciata, v. d. Wulp. 174 
25. 
26. 
27. 
ochrifrons, v. d. Wulp. | 50 
murina,v.d. Wulp. | &O 
assimulata, v. d. Wulp. } KO 
28. 
remota, v. d. Wulp. | <) 
29. . 
sublineata, v. d. Wulp. 1G] 
ovata, v.d. Wulp. |} § 2 
3l. 
33. 
et 
cupreiventris, v. d. Wulp. cake Coe / om 
32. 
placida, v. d. Wulp. K ee 
illucens, v. a. Wulp. | § 
12+ 
2 
oa 
argentifrons, v. d. Wulp. ' 
34. 
occulta, v. d. Wulp. / a 
35. 
36. 
37. 
