332 
STUDIES IN AMERICAN EPHYDRIDAE (dIPTERa) 
convex, without distinctly defined tubercles, with the sculptur- 
ing confined to the narrow facialia near the bristles; the alula are 
linear or very narrow, not auriculate. 
On the other hand, the separation of Ochtheroidea is not so 
easilj^ defined. In fact it is a cpiestion whether the two are 
distinct. However, the two species in our fauna have all the 
tibiae and their halteres lilack, and the arista short haired above. 
None of the known species of Ochtheroidea have this combination 
of characters. 
Ocneric Diagnosis . — In general build similar to Gijmnopa. 
lyyes slightly oblique elongate; vertex sharp and arcuate. 
Ocellars situated beyond line of anterior ocellus; proclinate 
orbital well developed; reclinate frontal distinct. Frons usually 
broader than long; lunule slightly depressed. Face with median 
area below subtuberculate to convex; facialia, generally, not 
defined mesally, with three or more appressed bristles or hairs 
emitted from minute pits close to the para-facial groove; para- 
facialia narrow above, the groove continuing to the post-buccal 
ridge. Arista short hairetl above. Fourth alidominal segment 
the longest; fifth short. Alula of wings narrow, not ]iroduced 
beyond the cleft, with long cilia. 
(renotype. — Notiphila glabra Meigen (1830). [IMonotypic.] 
The two forms occurring within our fauna seem also to b(' Fui'o- 
])('an species, and may be distinguished as follows: 
vMl til)iae eutireb^ Ijlaek. 
Halter.s white Ochtheroidea centralis 
1 1 alter. s black. 
M(!Son()tal .soctulae irrofivilar; .scutelluin scabrous, flattened glabra 
Mesonotal .setulae seriated; scutelluin .smooth, convex ordinata 
Only fore tibiae entirely Idack (see Ochtheroidea). 
Athyroglossa glabra Meigen (Plate XX, figure 2.) 
1S:I(). Notiphila (jlabra Meigen, Syst. Besehr., vi, Gfl. 
ISGO. Alhjfrodlo.ssa. (/lahra bomv, Neue Bt'itr., \ii, 12. 
In comiiaring oui' mali'i'ial with s])ecimens of glabra fi'om 
Furopi', I find veuy litth' difleri'ntiat ion. Tlu'i't' may be slightly 
mor(' sculpt ui’ing and t lu* temah'S ai'(' always more' shining than 
the males in our spi'cimens. ddu* siii'cies si'cni to bi' well 
dist.ribut (m1. 
