New Smynthuridae from the District of Columbia

154 ENTOMOLOGICAL SOCIETY

NEW SMYNTHURID^E FROM THE DISTRICT OF COLUMBIA.

By NATHAN BANKS.

The

spring-tails of the family

Smynthuridae

^{are the}

most

inter esting

forms

of the

order Collembola. They

^exhibitconsiderable diversity in structure

and

habits,

and

the species are

mostly

^well

marked. Several

_years

ago

^I reported

on

the

forms found on Long

^Island,

^{N. Y. Since} coming

^to

Washington

^I

^{have been} on

the

lookout

for

them, and have

taken a

number

of _species,

most

of

which were

_already

known. Three, however,

^{are dif} ferent

from any ^forms

yet

known from

this country,

and

their descriptions are presented

below

:

Dicyrtoma front

^{alts n.} sp.

Head

_{paleyellowish,}abroad

brown

(nearly black)band connecting^an- tennseandthenextending back ^tothe hind marginof the head,above a median black dot; ⁱⁿfront across face isabroad

brown

band, the nasus belowit being brighter yellow than the ^rest of the head; the thorax ^is pale, black-spotted on _sides;

abdomen

above dark purplish thrown, and tubercle

more

reddish,and

showing

^twopalespotsabove; basal joint of antennae dark brown,^rest_paler

brown

; legs pale,rather

brown

on_tips of joints; spring pale. Second _jointof antennae long and _slender,shorter than breadth of head,thirdaboutaslong^asthe second, apparently divided into three subequal portions, ^lastjoint short, pointed;

abdomen

_short, high, sloping suddenly behind, above beyond ^the middle is a distinct rounded tubercle eachside,and _{a slight} one in the median linebehind;

furcula long, the dentes two andone-half timesas long^asthe mucrones, with afewbristlesbelow; mucronesfinely serratebelow,tipcurved

down

ward; ^afew hairs on _head, a few_{very short} ones on posterior slope of

abdomen,

longeroneson anal tubercle. Length, ^1.2

mm.

Washington, ^D.

^C.,

January

^;

^under

^{leaves in}

^woods. Readily

known by markings

of the head.

Smynthurus facialis

^n. sp.

Heal

_pale brown, with ^atransverse ivory whiie band, broadestⁱⁿ the middleand _slightlypointed below,extending back belowbase of antennae to the

abdomen;

^{vertex with} pale spots, a

row

of

them

_connecting the bases of the antennae; each ocellussurrounded with_white; basal jointof theantennaebrown,^{with a}white spot above,second _joint

brown

at base, rest pale. Legs banded, femur^{with a} dark band near the _tip, three on

tibia.

Abdomen

abovewhite, thebasalpart with

many

small ivory white spots, arranged

more

or less in three rows, the middle one _including a

brown

_line;

dorsum

_beyond themiddlewith irregular white,brown, and afew_larger black spots^; anal tubercle abovewhite, with ^a medianblack stripe; spring pale purplish; venter pale on apical part,darker onbase.

OF WASHINGTON. 155

Basal_jointofantenna longer than broad,second _joint twice as long^as

first, third one andone-halftimes as long^as the second, fourth as long as the rest together, divided ^{into 18} or 20 _subjoints.

Abdomen

rather long;behindisaprominence each side;

dorsum

clothed with ratherlong hairs; furculaofmoderatelength, the dentes aboutfourtimes aslong ^as broadat base,with hairs beneath, mucrones about one-third the length of the dentes, finely serratebelow. Length, ^2.

mm.

Washington, ^D.

C.,

under dead

_leaves,

January. Separated from

S. sylvestris

by

^the

markings

^of

^head and

antennae,

and dorsum

of

abdomen.

Smynthurus

trilineatus, n. sp.

Pale; head andbasal halfofabdominal

dorsum

with three

brown

_stripes, thelateralone_passingthrougheyeand base of antenna

down

_upon the face, behind on

abdomen

_they converge toward ^the middle; ^the middle stripe, which is narrowerandwith

more

even margins, on^theheaddoes not extend

much _beyond

bases of antennae, behind reaching ^{as far as} lateral stripes; justbeyond ^theendsof these_stripes and across the

mid

dleof

dorsum

^isa blackish band, behind whichare two _large submedian black_spots, narrowly connected^{toa smaller}

median

one behind on the analtubercle, a few less striking ones on the _{sides; legspale;} spring pale; antennas brown. Basal joint ofantenna _short; the second _full}' twiceas long; ^third oneand three-fourths times as long ^asthesecond;

fourthas long^{as rest}together, with about 18 annulations; dentes about three and one-half times as long ^as wide at base, with hairs below;

mucrones_fullyone-third the length of the dentes, _finely serrate below.

Length, ^1.6

mm.

Washington, ^{D. C.} Hopping ^{over moss and dead}

^{leaves in}

May.

Mr. Heidemann

read the

following paper

^:

REMARKS ON LIGYROCORIS CONSTRICTUS SAY AND DE SCRIPTION OF PERIGENES _{FALLAX, A} NEW SPECIES.

By ^{O. HEIDEMANN.}

Some time ago

ⁱⁿ

working ^on

^the

group Myodocharia ^of

^the

Family

LygaBidae ^I

found

that

my

material of

Liygrocoris

^con- str ictus

Say, from Washington, D.

C., Florida

and _{Texas, con}

tained

two

different

forms which

I

had formerly determined

^as

belonging

^to

one

_species.

The mutual resemblance

of the

two forms

is

very

striking.

Anyone might

easily

be

_deceived,

and

it

seems

that this has often

been

the _{case, as} the writer learned later

through

^his

correspondence on

^the subject.