1937] 
Exotic Syrphid Flies 
31 
ment apically about two-thirds as wide as the fourth segment. 
Sides of the short first segment convex with stiff bristles. 
Margins of the abdomen curling over, especially posteriorly, 
where they decrease the width some. Femora short, straight, 
scarcely thickened. Tibiae distally a little thickened and a 
little pinched, every bit as long as the femora. Wings con- 
siderably longer than abdomen. Alulae reduced. Subapical 
cross veins close to wing margin, but very sigmoid. Third 
vein and costa carried down somewhat deeply at the end of 
the wing. Vena spuria heavily chitinized. Stigma dark. 
Genotype : Oligorhina cenea n. sp. 
Oligorhina aenea n. sp. 
A curious species characterized by the very brown wings, 
darkened apically with a dark brown stigma. The rusty 
orange front, the black spot above antennae and facial strip 
black. Vertex bright yellow, pleurae, humeri, sides of pro- 
notum calli, scutellum and anterior pairs of legs and the base 
of hind femora. The cheeks pale brownish yellow, the sides 
of the face bright shining yellow. Abdomen reddish brown, 
basal and apical borders of the remaining segments broadly 
shining, but preceded by opaque bands, which are produced 
forward as a slender triangle as far as the base of the 
segment. 
Two females. Desbarriere, Mt. La Hotte, Haiti (4000 
ft.) , October 12, 1934 (Darlington) . Type in the Museum of 
Comparative Zoology. Paratype in the author’s collection. 
EXPLANATION OF PLATE II 
1. V elocimyia velox n. sp. (abdomen) 
2. V elocimyia velox n. sp. (hind femora) 
3. V elocimyia velox n. sp. (wing) 
4. Lathy rophthalmus vitrescens n. sp. (abdomen) 
5. Microdon argentine n. sp. (wing) 
6. Microdon digitator n. sp. (antennae) 
7. Microdon investigator n. sp. (antennae) 
8. Microdon investigator (wing) 
9. Hypselosyrphus trigonus n. sp. (profile of head; 9 a is scutellum) 
10. Paramicrodon novus n. sp. (wing) 
11. Paramicrodon novus n. sp. (profile of head) 
12. Syrphus cinereomaculatus n. sp. (abdomen) 
