342 
STUDIES IN AMERICAN EPHYDRIDAE (dIPTERa) 
CEROMETOPON Cressoii 
l'dh\.Cero>nct()pon. Cressoii, Ent. News, xxv, 241. 
A genus of but one known species, which suggests those of 
(rymnopa in general appearance. The face is, ai)parently, 
without the usual differentiated areas, a character which may 
be present only in the type species. The parafacial groove is 
suggested by a line of deeper pits in the excavated wrinkles. 
Otherwise the entire face is transversely wrinkled. 
Generic Diagnosis . — Head slightly broader than high. Eyes 
obliquelj^ elongate, not prominent. Vertex sharji; ocellar lirist les 
oiiposite the anterior ocellus; frontal and orbitals well developed; 
lunule not developed. Face with subheniisiiherical concavity 
lieneath antennae, behnv which the face is evenly convex, not 
prominent, and strongly, transversely wrinkled; bi'istles numer- 
ous, situat(Ml in deeper pits within the wrinkles in a series each 
sid(' coi-responding with the jiarafacial groove, (du'eks ami)l(i, 
with the post-buccal margin strongly keeled. C'lypeus promi- 
nent. Mouth small. Antennae short, with second joint weakly 
si)ined; arista pectinate above. 
Thorax quadrate; no pri'scutellars; setulac^ numerous and 
irrc'gular. Scutellum ample. Abdonum ovate, with fourth 
segment the longest; third and fifth subeciual. l.egs sim})le; 
fore coxae short; fore femora unarmed. Wings with second 
vein long; third and foin-th converging; alula auriculate, not 
ciliate. 
Genotype. — Geronieiopon. inosilloides (h-(‘SSon, (1014). 
Cerometopon inosilloides Cressoii 
1014. (kronietopon inotiUl<n(k‘.s Cressoii, En(. News, xxv, 242, pi. x, lifi’. o. 
Descriplion. — Jtlaek; palpi, tarsi except aiiiccs, apices of middle and hind 
femora and their tibiae, yellow; all tibiae silvery on outer surfaces; fore 
tibiae brown; wings yellowish with jialc veins. 
Frons broader than long, shining, with no differentiated areas, but willi 
distinct spherical pits as follows, a pair behind and a pair before the line of 
the anterior ocellus. Face more than one-half as broail as vertex, shining, 
or slightly dusted in the depressions, with metallic tints. Cheeks hardly 
one-half as broad as eye-height. Clypeus depressed. Antennae with third 
joint discoidal; arista with five hairs. 
Alesonotum ojiaiiue with greenish gray, granular, jiollinose vesture, and 
three narrow brown vittae medianly, which do not attain tlie posterior margin. 
Scutellum almost flat-, colored as mesonotum, with weakly tuberciilated 
