32 DIPTERA 
35. Last posterior cell four times as long as wide; hind femora 
twicethe width of theanterior ones . . . . . . . E. ARDOPEODES, nov. Sp. (1). 
Last posterior cell threetimesas long aswide. . . . . . . . . «4 4. . 4. . 36. 
36. Upper valve of pygidium ending in a long strong curved 
spine, lower valve ending in a flat broadly U-shaped 
pRXMME - 0 So o. o. s oco rw 0 ws pu DRM NNNM NR MEE 
Upper valve ending in a flattened piece, lower valve in two 
large disconnected leaf-like processes. . i Uo c ecR QU EI Ter MNA NC NM 
37. End-piece of upper valve very short, left Pu dieti PN 
veloped; hind femora three times width of anterior ones E. cusPipaTUs, nov. sp. (3) 
End-piece of upper valve very long, left basal plate large 
and elliptical; hind femora only moderately robust . . E. BAROPEODES, nov. sp. (4). 
strongly spinose, ten spines in outer flexor row, one on outer face at four-fifths the length, two tandem above the last-men- 
tioned, five along inner face, seven in inner flexor row and along the flexor face several irregularly located, the flexor 
spines arising from small tubercles; hind trochanters spinigerous. Halteres black; wings uniformly but slightly infu- 
mated. Stigma brown, sections of fifth vein 3 : 1 ; 
Female, Bristles of hind legs reduced, none on trochanters, about five to seven in outer flexor row, one on outer 
face and one above and three in inner flexor row, all toward knee. 
Three males and three females, La Suiza de Turrialba, Costa Rica, Pablo Schild, collector. 
(1) Euhybos ardopeodes, nov. sp. — Closely related to E. thrixothrix, differing in the following characters; last 
antennal joint slightly more than twice as long as wide; processes of genitalia smaller, the terminal prong slender, curved, 
pointed and talon-like; hind femora a little shorter than the tibia and trochanter together and with reduced chaetotaxy, two 
bristles onupper anterior face toward knee, none on posterior face, about ten irregularly placed in each of inferior rows 
with irregular spines between. In the female the bristles of the hind femora are still further reduced, with seven inthe 
lower anterior row and only apical three in the lower posterior row. 
Three males and three females, La Suiza de Turrialba, Costa Rica, Pablo Schild, collector. 
(2) Euhybos spiniger, nov. sp. — Male. Length3 mm. Black, anterior tibi? brownish, base of tarsi yellowish, 
wings hyaline, no stigma, tbird joint of antennze elongate oval, slightly over twice as long as wide, arista twice antennal 
length; occiput lightly cinereous. Notal hairs pale, sparse pollen gray, twoscutellars, Abdominal hairs all pale, upper 
valve of pygidium ending in a long curved black spine, which is in reality double but connate, lower valve ending in a large 
flat process which is deeply excised to admit the opposing spine, the left portion narrow and ribbon-like, the right portion 
broader and with an acute expansion along left side. Four moderate extensor bristles on middle tibiz, no spine on tro- 
chanters, hairs of hind femora pale, one anterior and two extensor bristles near knee, no posterior bristles, flexor 
short and thick arising Ads roughenings of the surface, seven in anterior row, the others irregular, hind knees paler. 
Section of fifth vein 2.5 : ; 
Female. Purdiestn simple, hind femora with smaller bristles. 
: Four specimens, Liguanea Plain, Jamaica, November-December, 1911, C. T. Brues, and one from Utuado, Porto 
Rico, January 1899, August Busck, the last in the U. S. National Museum. 
(3| Euhybos ouspidatus, nov.sp. — Male  Length3.5 mm. Body, femora and tibize piceous black, knees and 
tarsi yellowish ; wings uniformly smoky hyaline, the elliptical stigma brown. Arista elongate oval, two and one-half times 
antennal length ; occiput dusted with yellowish gray. Notal hairs brownish, paler in front and darker in back, four scutel- 
lars, pollen above wings yellowish. Abdominal hairs pale, pygidial hairs long, the middle and apical processes of left or 
lower valve very large, leaf-like, pointed and together terminating the pygidium one from each side. Hind femora robust, 
in length equal to tibia and metatarsus together, its hairs yellow, no spinous bristles on front or back faces, one above toward 
knee, about ten in flexor rows. Submarginal cell two-thirds width of stigma, sections of fifth vein 1 : 0.6. 
Holotype, Horse Neck Beach, near New Bedford, Massachusetts, August 4, 1896, G. de N. Hough, collector. A 
female which I collected at Cold Spring Harbor, New York, is not associated with any other species and may epe belong 
here. Ithas hyaline wings, no stigma, black body and naturally more slender hind femora. 
(4) Euhybos baropeedes, nov. sp. — Male. Length 4 mm. Piceous black, anterior tibie brown, tarsi 
testaceous, wings uniformly lightly smoky. "Third antennal joint broadly lanceolate, scarcely twice as long as wide, arista 
two and one-half times length of antenna; occiput lightly cinereous. Notal hairs brown, pollen gray, two scutellars. 
Abdominal hairs whitish at base, brown on the large globose greatly distorted pygidium, left or lower valve bowl-like, with 
a pointed process at right end and terminated by two widely separated strong curved flattened convergent finger-like pro- 
cesses, the right valve much smaller and ending in a large L-shaped process the extension of which is directed to the left 
between the two left processes of the left valve. "Three small extensor bristles on middle tibize, no spine on trochanters ; 
