TAXONOMY OF 1 MUSCOIDKAX FLIES — TOWNSEND 59

ments,

and male

claws very long. Clinoneura has parafacials bare, only one pair of discal macrochaetae

on

middle abdominal segments.

The

species described

by Robineau-Desvoidy

^{as Bstlieria tibialis is} neither a Ptilodexia nor a Clinoneura, since it has the apical cell petiolate.

Ptilodexia has cheeks (male) about, or slightly over, one-half eye height; antennae inserted low, so as to give a long frontal profile

;

vibrissas inserted high above oral

margin

^;

no

strong or other recli- nate vertical bristles; second antennal joint elongate

and

third shortened.

DOLICHOCODIA,

gen. nov.

Near

Myiocera,

from which

it differs as follows:

Head

conspic- uously elongated anteriorly, apical cell open. xA.ntennse inserted

on

orabove middle of eyes; proboscis slender

and

horny, with long fili-

form

palpi

which

are but slightly thickened apically

and

bear very longbristles; parafacials wider; long axis of

head

at antennal inser- tion fully equal to that at epistoma^;

head

longer than high. Type,

Myiocera

bivittata Coquillett, described

from

specimens collected

by

the writer

on

the

Rio

Ruidoso, in the

White Mountains

of

New

Mexico.

EUCH^TOGYNE,

gen. nov.

Like Chcetogyne, butproboscis rather stout

and

onlya little longer thanhead height^; hindtibiae completelyciliate

on

outer edge,with

no

bristles

among

the cilia. It agrees with Chcetogyne in having the carina wide, flattened

on

its edge

and

conspicuously

furrowed

on

median

line. Type, Hystrichodexia roederi Williston

(Kansas

Univ.

Quarterly, 11, pp. 77-78), described

from Arizona

(1 male).

For

purposes of comparison, the following characters are given for cer- tain alliedgenera

:

Hystrichodexia has proboscis shorter than

head

height.

Paraprosena

has carina

narrow and

^thin.

Chcetogyne has proboscis very long

and

slender, hind tibiae with longmacrochaetae

among

the cilia.

Phorostoma

has only a

weak

rudimentary facial carina.

Buchcetogyne roederi Williston.

— Three

males in

U.

S. N.

M.

;

two

collected

by

the writer in

Meadow

Valley, Sierra

Madre

of western Chihuahua,

head

of

Rio

Piedras Verdes, about _7,300 feet,

August 30 and September

2^;

and

one labeled "Mexico, 400,

Phoro-

stoma."

Williston says in his description: "Third, fourth,

and

fifth seg-

ments opaque

golden yellow."

The

so-called fifth

segment shows

'C)0

SMITHSONIAN MISCELLANEOUS COLLECTIONS

VOL. 51 very narrowly, being the base of the

hypopygium.

It is in reality the sixth segment, since there is a very abbreviated basal

segment

present.

What

appears to be the fifth

segment

is only the portion

of

the fourth behind the transverse

row

of submarginal

macro-

chaetae.

The

scutellum

shows

practically

no

yellowish

on

apex.

The

third

segment

(called second heretofore) has, in addition to the six

approximated

macrochaetae

on

hind border in middle, three or four (usually four)

approximated

lateral ones

on

each side.

The

second

segment

(so-called first) has one lateral macrochaeta

on

each side.

The

apical decussate pair of scutellar macrochaetae is quite as strong

and

long as

any

of the others of scutellum.

The narrow

linear yellow of hind

margin

of third

segment

is continued in a slight anterior prolongation

on

the

median

line in the

two

Sierra

Madre

specimens. In addition to the

two

large silvery spots of third

segment

of venter, there are

two

smaller ones

on

the second

and

fourth ventral

segments

in the

above

specimens.

Genus

Myxodexia

Brauer and von

Bergenstamm

Syn. Tfopidomyia Brauer

&

^vox

Bergenstamm

(preocc).

Neotropidomyia Townsend, nom. nov. (Dec, 1891), Trans.

Am.

Ent.

• Soc, xviii, p. 382.

The

type of this

genus

^is

M. macr

onychia

Brauer and von

Ber-

genstamm,

of Syria.

Subfamily Trixin/e

EUCLYTIA,

gen. nov.

This

genus

is herewith proposed for the species Clytia flava

Townsend

(Tr.

Am.

Ent.

Soc,

xvin, _pp. 372-373). ^It

may

be

known by

the

two rows

of

weak

frontal bristles

on

each side of frontalia. the outer

row weaker and somewhat

irregular.

The

epis-

toma

is but slightly prominent.

Specimens

in

U.

S. N.

M. ^have

been referred

by Brauer and von Bergenstamm

to Redtenbacheria, but the species certainly can not be included in that genus.

It is distinct

from

the old

genus

Clytia,

now

to be

known

as Clytiomyia, of

which

the

European

C. helvola is to be taken as the type. Clistomorpha also is a very different genus.

Both

Clisto-

morpha and

Clytiomyia belong inthe Phasiidae.

Tribe

P

hasiopterygⁱni

Genus Phasiopteryx Brauer and von

Bergenstamm

Phasiopteryx bilimeki

Brauer and von Bergenstamm. — The

re-

marks on

this species in

Ann. and Mag.

Nat. Hist., xix. pp. 33-34,

TAXONOMY

OF

MUSCOIDEAN

FLIES

— TOWNSF.ND

6l indicate differences

between

Phasiopteryx

and

Neoptera,the signifi-

cance of

which

did not appeal to the writer at the time. It

seems

quite certain that several

forms

are confused here.

The

specimens that the writer has seen of related

forms

in the CEstrophasiinae in- cline

him

to the beliefthat large series of material will demonstrate the distinctness of

Neoptera and

Phasiopteryx. It

must

be

remem-

bered that only a fraction of the neotropical fauna is yet

known.

Besides the differences, pointed out below,

between

CEstrophasia

and

Phasiopteryx, the following

may

also be noted^: CEstrophasia

and Ccnosoma have

the facial plate flat or subcarinate^; antennae in- serted distinctly

below

middle of

extreme head

height, almost as

low

as lower

margin

of eyes; arista very short

and

bare,

and

third antennal joint only about as long as second. Phasiopteryx has the facial plate

more

strongly, often quite strongly, carinate; antennae inserted but little

below

middle of eyes, distinctly above middle of

extreme head

height; arista very long, very distinctly but finely

and

thinly hairy (looks bare in

some

specimens, apparently

from

the fine hairs being lost or

rubbed

off),

and

the third antennal joint always twice as long as second.

Subfamily CEstrophasiix.e

Genus CEstrophasia Brauer and von

Bergenstamm

CEstrophasia clausa

Brauer and von Bergenstamm. —

^{This is a}

northern species.

The

specimens

from

Cuautla, Mexico, referred here

bv

Giglio-Tos, doubtless represent another form. Cuautla is

thoroughlytropical,

and

clausa is a transition

and

boreal form.

The

ultimate section of fourth vein in

Cenosoma

signifera

and

calva is normally rather deeply

bowed

^in, but not so in CE. setosa

and

clausa, both of

which have

the apical cell very short petiolate, while setosa has third vein bristly nearly to small crossvein.

The

antennae of CEstrophasia

and Cenosoma

are widely separated

by

a characteristic

median

enlargement of the lunula in both sexes of all the species. This is absent in Phasiopteryx,

which

has the antennae closely approximated.

Genus Euoestrophasia

Townsend

Eua-strophasia aperta

Brauer and von Bergenstamm. —

^This

South American form seems

generically distinct

from

the species of CEs- trophasia in its

open

^{firstposterior cell, as} pointed out in Trans.

Am.

Ent.

Soc. xix

_(1892), p. 133.