234 DIPTERA. 
15. Rhynchodexia striata, sp.n., ¢. (Tab. V. figg. 6; 6a, head.) 
Thorax light grey, with well-defined black bands ; abdomen cinereous, with black reflecting spots; antenne 
black, with the base rufous; palpi rufous ; legs black; tegule and base of the wings yellow. 
Length 15 millim. 
Of a more oblong shape than the preceding species. Head light sericeous-grey, with dark reflections; front 
much narrowed behind; frontal band black, immediately before the antenne somewhat rufous; vibrissal 
swellings parallel. Antenne short, the two basal joints and the base of the third rufous, the latter for the 
rest black ; second joint prominent, with a long and some shorter bristles ; third joint twice as long as the 
second; arista densely plumose. Proboscis black, its terminal lips and the filiform palpirufous. Thoracic 
dorsum with three distinct black bands, the median band narrower than the others and on each side accom~ 
panied by a small black stripe ; scutellum grey, with black reflections. Abdomen conical ; first segment 
black, with two greyish lateral spots: the following segments yellowish-cinereous, with blackish reflecting 
spots, which in some directions occupy the entire hind borders ; second and following segments with many 
discal and marginal macrochete. Legs black, with scattered bristles ; foot-claws and pulvilli elongate, 
the pulvi!li yellowish-grey. Tegule and base of the wings yellow, the wings for the rest brownish ; small 
cross-vein a little before the middle of the discal cell; curvature of the fourth vein with a somewhat 
rounded angle ; apical and posterior cross-veins slightly curved. 
Hab. Panama, Volcan de Chiriqui 3000 feet (Champion). 
A single male specimen. 
16. Rhynchodexia anthracina. 
Rhamphinina anthracina, Bigot, Ann, Soc. Ent. Fr. 1888, p. 265. no. 62. 
Prosena obscura, Bigot, |.c. p. 264. no. 56. 
Black; head whitish; palpi and base of the antenne rufous; tegule and base of the wings infuscated. 
Length 8°5 millim. 
Unicolorous black. Head white, with blackish reflections; oral margin rufous; front of the male narrowed 
behind, that of the female as broad as the eyes; frontal band blackish-brown ; facial carina little promi- 
nent; vibrissal swellings parallel. Antenne rufous; second joint somewhat prominent, with long 
bristly hairs; third joint infuscated towards the tip, fully twice as long as the second ; arista brown, 
long-plumose, thickened at the base. Proboscis black, longer than the head; palpi pale rufous, slender, 
scarcely thickened towards the tip. Thorax on the anterior side and laterally with some grey tomentum ; 
dorsal stripes very obsolete. Abdomen ovate, shining black, with some bluish tint; second and following 
segments with discal and marginal macrochete. Legs black, with rather long bristles; foot-claws and 
pulvilli elongate in the male, the pulvilli yellowish. Tegule and base of the wings brownish, the wings 
for the rest grey; small cross-vein a little before the middle of the discal cell; curvature of the fourth 
vein with a rounded angle; apical cross-vein slightly concave; posterior cross-vein curved. 
Hab. Mexico (coll. Bigot), Ciudad in Durango 8100 feet (Forrer), 
Two male and two female specimens have been received from Mr. Forrer. 
I have seen typical examples of both Rhamphinina anthracina, Big., and Prosena 
obscura, Big. Though they are in a bad state of preservation, I am able to state that 
they certainly belong to one and the same species. 
17. Rhynchodexia planifrons, sp.n., ¢. (Tab. V. fig. 7, head.) 
Obscure cinereous; thorax with obsolete stripes; abdomen with black and whitish reflecting spots; palpi an 
base of the antennz rufous; legs piceous, the knees and tibie rufous. . 
Length 12 millim. 
