338 
STUDIES IN AMERICAN EPIIYDRIDAE (dIPTEKA) 
below niedianly (fig. 3); facialia with transverse pits and rugae along the 
grove which extend mesally toward the transversely wrinkled median gibbosity, 
the wrinkling extending uji to and on the weak carina; bristles short, hair-like. 
Cheeks one-half as broad as eye-height. Antennae short, situated at the 
center line of the eyes and above that of the head; arista with about three 
hairs above. 
Mesonotum convex, oi)afiue, densely granulose and somewhat pollinose. 
Scutellum sculpture as on mesonotum, flat, rectangularly broader than long, 
with all the marginal hairs and bristles on minute tubercles. Abdomen flat, 
elongate-ovate, suboj)aque, with sharp lateral margins, with sculpturing 
as on mesonotum but less pronounced; fourth .segment the longest; fifth the 
shortest. Legs slender; femoral spines with the proximal one abruptly the 
longest, and the remaining ones more uniform (fig. 12). Third costal sec- 
ti(jn of wings three times as long as second. Length. — 2.5 to 2.75 mm. 
Type . — Male ?; St. Vincent, West Indies, [British Aliisetiin?]. 
Paratypes . — A male in the American Museum of Natural 
History collection. No. 20324, bears no data exceiit Dr. Williston’s 
detei-mination label; a female in the same collection is also labelled 
"Leewai'd near sea by o])en stream. Sept., no. 20322.” There is 
also a specimen in the Kansas Univei-sity collection. 
Malrrinl Examitu-d . — lb specimens. 
Pan.\ma: Colon, December, 1911, (Ujhelyij, [Hung. Nat. Mus.]. 
Tiunidad: June, 21, (A. Busck), [U. 8. N. AI.]. 
Hhitlsh Guiana: Bartica, May 11, (R. J. Crew). Georgetown, July 11, 
[A. N. AI. H.], Tumatumari, July 11, [A. AI. N. H.]. 
Ochtheroidea similis Cresson (Plate XX, figure 7.) 
1918. Ochtheroidea sitnilis Cresson, Trans. Am. Ent. Soc., xliv, til. 
A very distinct species showing affinity with atra, lint with 
some aspects of laevis. The face is very strongly convex, rather 
abruiitly so, giving a gibbo.se appearance; facialia distinctly, 
ti'ansversely wrinkk'd, with the hair-like bristk's arising from 
grooves insttuid of pits, a.s in Idcuis. 'Tlu'si' as wt'll as tlu^ broad 
fac(^ and cheeks ai’(' the salitmt charactt'i'S. 
Dc.scriiition . — cf- Black; middle and hind liliiae and their tarsi, except 
auici^s of latter, yellow; fore tarsi with thri'c basal joints whitish; halteres 
white; wings hyaline, with dark veins. Shining to nearly polished. 
Frons broader than long. Face broad, more than one-half as bi'oad as 
verte.x, deeply depressed above and eveidy convex below medianly; facialia 
with deep, transverse pits; bristles hair-lik(‘; median anai miero-granulose, 
hardly polished. (Jieeks abouti one-halt as broad as ej’e-height. Clypeus 
n't real ing. Arista with sewen hairs. 
AI(\sonotum and scutellum not (luiti' ])()lished, micro-granulost'; setulae 
of former minute, scarcely disi'ernible, not seriated. Abdomen polished; 
