18 DIPTERA OF NORTH AMERICA. [PART IV

GERxVNOMYIA. 79 lislied six species

from

Brazil, Chile,

and

the

West

Indies;

Mr.

Walker

{List, etc. Yol. I), one from

Jamaica and

(Dij^t.

Saund.

pt.

Y)

one

from

Brazil; Dr. Philippi(Ve?^h. Zool. Bot. Ges. in Wien, 18G5, p. 597, Tab.

XXIII,

fig. 1) described four species fromChile

under

the

new

generic

name

ofPlettusa;

Mr.

Bellardi (Saggio, etc. Ax)pendice, p. 2) one from Mexico.

As

three species from the

United

States

have

been described below, this

makes

a total of

twenty

species, onlyfour of

which

belongto the old world.

Macquart's

Aporosa and

Philippi's Plettusa being identical with

Geranomyia and

posterior toit inpoint oftime,

have

to be given

up

as genericnames.

The name Geranomyia

is derived

from

ylpavoj, a crane,

and

/iL'ia, a fly.

Table fordeterminingthe species.

, (

Wings

spotted. 1rostrataSaj/.

i Wingsnot spotted. 2

fTheauxiliaryveinends inthe costanearlyopposite the origin of the

I praefurca. 2diversa0. S.

2^•'

j The auxiliary vein ends in the costa far beyond the origin of the

I praefurca. 3 canadensis Westw.

Descripiivn ofthe species.

1.

G. rostrata

^Say.

%

and 9^•

—

Alisfusco-maculatis etnebulosis.

Wingswithbrownspotsandclouds. Long.corp. 0.3.

Syx. Limnohia rostrata Sat, Journ. Acad. Nat. Sc. Phil. Ill,p. 22,^6.

—

WiED.Auss. Zw. I,p. 35, 20.

Geranomyiarostrata0. Sacken,Proc. Ac. Nat. Sc.Phil. 1859,p.207.

Front and

vertex gray_; proboscis

and

antenliiB black.

Thorax

grayish, oftenwith a yellowishor

brownish

tinge^; three

more

or lessdistinct

brown

stripes; laleurtewithahoary

bloom

; scutellum

and metathorax

brownish, with a grayish

bloom

; haltereswith a

dark brown knob

; feet

tawny,

tips of the tibia3 black, sub- clavate in appearance; tips of the tarsi infuscated.

Aljdomen

brown, venter paler.

Wings

with five

brown

spots along the anterior

margin

; the cross-veins

and

the tips of all the veins alongthe

apex and

alongthe posterior

margin

are clouded with pale brown.

Hah. Washington,

D. C.;

Xew ^York;

Massachusetts; Illinois;

Canada.

I

have

brought

home

a

specimen

from

Cuba, which

I

80

DIPTERA

or

NORTH AMERICA. [PART

IV.

believe to be the

same

species. It

shows some

slight differences, the

most

striking of

which

^is, that the

brown

spotat the tip of the first longitudinal vein is limited posteriorly

by

the second longitudinal vein; whereasin

my North American

^{specimens, it}

crossesthisvein

and

invades theinnerendof thesubmarginalcell.

2.

G.

^{tlivei-sa 0. S. % and}

9.—

Thoracecinereo, vittistribusobscure fuscis; veuffiauxiliaris apice prafurcae^initioplusminusveopposite.

Thoraxgray,withthreedarkbrownstripes; thetipofthe auxiliary vein

isnearlyoppositetheoriginofthe prsefurca. Long. corp. 0.25

—

^0.28.

Syx. Geranomijia diversa 0. Sacken,Proc.Ac. Nat. Sc. Phil. 1859, p.207.

Proboscis, palpi,

and

antennae black; front

and

vertexgrayish.

Thorax

with a grayish

bloom above and with

three well

marked dark brown

stripes; pleurae, scutellum

and metathorax

hoary, their

ground

color

brownish

; halteres

with

a

brown knob

; feet

tawny,

coxae

and

basis of the

femora

paler.

Abdomen brown;

male

forceps paler.

Wings

slightlytingedwith

brownish

;

stigma

very slightly darker; a slight, hardly perceptible nebulosity at the origin of the praifurca; the marginal cross-vein forms an obtuse angle,

sometimes

nearly a straightline,with thetipof the first longitudinal vein; the tip of the auxiliaryvein isopposite the origin of the prsefurca.

Hab. Trenton

Falls,

N. Y.

The

proboscis of this species is

much

shorterthan that of the

two

other species.

The male

of

Limnohiorhnnclius

hraziliensis

Westw. ^{Ann.

^Soc. Ent. de Fr. 1835, p. 683) is a

Geranomyia, which

is not unlike G. diversa; the stripes of the thorax are likewise

narrow

antl dark,

and

the positionofthe marginalcross- vein isthesame. I

have

seen the

specimen

in

Mr. Westwood's

collection, without

having

subjected ittoa close

comparison

v.^ith

G. diversa.

3. CS.

canadensis Westw. %

^{and 9.}

—

Thoracepallidefnsco, vittis tribus obscurioribus; venaauxiliariponeprsefurcseinitiumextensa.

Thorax pale brown, with three darker stripes; auxiliary vein extended beyondthe origin of the prsefurca. Long.corp. 0.25

—

^0.28.

Syn. Limnohiorliynchus canadensis

Westw.

Ann. Soc. Entom. deFr. 1835, p. 683.

Geranomyia communis0.Sacken,Proc.Ac.Nat.So.Phil. 1859,p.207.

RHIPIDIA. 81

Head

tawny,

somewhat

grayishonthe front; antennaeblackish,

under

side of the first joint

tawny

; proboscis

and

palpi brown, the former paler atthe basis.

Thorax

brownish,with three

more

orless

dark brown

stripes

; pleurae paler;

metathorax

brownish, with a

hoary bloom

; iialteres infuscated, pale at the basis; feet tawny, tips of the femora, of the tibiae,

and

of the tarsi brown.

Abdomen brown,

posterior

margins

of the

segments

paler; venter pale.

Wings

very slightlytinged; stigma brownish; the tip of the first longitudinal vein is.incurved

towards

the second, the

marginal

cross-vein being apparently

between

it

and

the costa

;

the tip of the auxiliary veinis nearly opposite the

middle

of the prgefurca.

Hah. Washington, D. C

^;

^Upper Wisconsin River

(Kenni- cott); Illinois

(LeBaron).

The

proboscis ofthis species is verylong, at least once

and

a half the lengthof the thorax. I

have

seen theoriginal

specimen

of

Limnobiorhynchus

canadensis

Westwood,

inthe author's

own

collection;

(compare

the

genus

Toxorrhina.)

Gen. ^III.

RHIPIDIA.

One submarginal cell; four posterior cells; a discal cell. Antennae 14-jointed^; hipectinate, pectinate or subpectinate_; joints of the flagellum alwaysdistinctly pedicelled. Rostrum andproboscissliort. Feetslender;

tibiaewithout spursat thetip; empodia indistinctornone. Theforceps of the male is like that of Dicranomyia and consists of two immovable, fleshy lobes,andahornystyle ontheunderside(Tab.Ill, fig. 5and5o).

Rhipidia

isprincipallydistinguished from

Dicranomyia by

the structure of the antennae. This structureis

most prominent and

peculiarinthe

male

ofR.

macidata M.

; the joints of the flagellum (exceptthe basal

and

the terminal ones) emitin this species two, rather long, branches.

In

the

two

other

North American

^species

and

in the second

European

species (R. uniseriata Schin.) the jointsof the flagellum bear onlya singlebranch,

which

isshorter

than

those ofR. macidata.

The

femalesofall the species

have

a moniliform flagellum, that is, the single joints are separated

by

distinct pedicels; the joints of the basal half of the flagellum are

somewhat

projecting

on

the

under

side.

The

auxiliary vein reaches

more

orless

beyond

the originof the

second

longitudinalvein,

and

in thisrespect

Rhipidia

agrees with those

North American Dicranomyise, which have

^spotted

6 July1868.