OLFERSIA. 429 
[N.B.—We have not succeeded in finding any entomologist willing to undertake the 
enumeration of the remaining subfamilies of the ‘“ Muscide Acalyptere,” viz. the 
Agromyzine, Borborine, Chloropsine, Drosophiline, Ephydrine, Geomyzine, and 
Sapromyzin, nor the family Phoride *.—Ep. | 
PUPIPARA. 
Fam. HIPPOBOSCIDA +. 
OLFERSIA. 
Olfersia, Wiedemann, Aussereur. zweifl. Ins. ii. p. 605 (1830). 
In the Mexican collections before me there are representatives of three species of 
this genus, which may be distinguished as follows :— 
1. Third vein reaching the costa at two-thirds of its length; first vein 
ending beyond the small cross-vein. . . Lo . . . . vulturis, v. d. Wulp. 
Third vein reaching the costa at three-fourths of its length ; first vein 
ending above or before the small cross-vein . . . . . . ee 
2. Auxiliary vein complete, ending in the costa; front broader than the 
eyes . . ee Loe . toe ee we ee). COriacea, v. d. Wulp. 
Auxiliary vein incomplete, not reaching the costa; front not broader 
than theeyes. . . 2. 1 ee ee ee ee ee ew engustifrons, v. A. Walp. 
1. Olfersia vulturis, sp.n., 9? (Tab. XIII. figg. 1, head; 1 a, wing.) 
Dark brown ; front and eyes shining; wings brownish; first vein ending beyond the small cross-vein ; third 
vein reaching the costa at two-thirds of its length. 
Length 6°5 millim. 
Nearly unicolorous dark brown; the eyes reddish-brown and shining ; front somewhat shining, with an 
impressed line on both sides along the eyes and several impressions in the middle. Shoulders conitorm, 
exserted ; transverse suture of the thorax very distinct. Legs robust; femora thick, the hind pair longer 
than the others; claws black. Wings with a brown tinge; first vein reaching the costa distinctly beyond 
the small cross-vein, which stands before the middle of the wing’s length; second section of the costa 
(from the humeral cross-vein to the end of the auxiliary vein) nearly as long as the third section (from 
the end of the auxiliary vein to the end of the first vein); the two following sections (from the first to 
the second vein and from the second to the third vein) shorter and of nearly equal length; the third vein 
ending on the costa at two-thirds of its length; second basal cell incomplete and retracted towards the 
base of the wing. 
Hab. Costa Rica, Rio Sucio (Rogers). 
Two specimens, one of which is labelled “ parasite of Vulture.” This species seems 
to be allied to Ornithomyia villadw, Dugés, which also belongs to the genus Olfersia ; 
* [These groups were undertaken by Van der Wulp, and the unworked material was returned to us after 
his death. Fully half the specimens, however, were so injured on the return journey as to be useless.—Ep. | 
+ [The MSS. of this family was sent to us, together with that of the Supplement, by Dr. Meijere, after Van 
der Wulp’s death.— Ep. | 
BIOL. CENTR.-AMER., Dipt., Vol. IL, Aprid 1903. ak 
