Arachnids from Coeos Island

20 ENTOMOLOGICAL SOCIETY

Sympetrum semicinctum

_(Say).

Kaslo,

August

⁶ (i $),

August

7 (i cT)-

[Sympetrum ^costiferum

(Uhler).

Wellington,

September

²

(Dyar

^{: i $).]}

[Sympetrum ^{scoticum (Donovan).}

Banff, Alberta _{(N. B.}

Sanson:

ⁱ teneral oⁿ, i adult d\ ⁱ $).]

Libellula

quadrimaculata

^Linnaeus.

Kaslo,

May

29 (Dyar: i$),

June

9 (i tf), J

une

IJ> Mirror Lake, 1,670feet,

and

Fletcher's

Ranch,

2,800feet (21

dV,

5$ 9,

2 pairs

m

coitu),

June

14 (2 cTcT),

June

¹⁶ (i$),

June

¹⁸ (i cT,

i $), July² (i tf).

The

_concluding

_paper was by

Mr. Banks,

and

entitled^:

ARACHNIDS FROM COCOS ISLAND.

BY NATHAN BANKS.

Cocos

Island, situated inthe Pacific

Ocean some

distance off

the

west

coast ofMexico, has

been

rarely visited

by

naturalists.

The

_{only spider} previously recorded

from

the island is Argy- roepeira nigriventris Keys.,

which was ^taken by

^the

Hopkins-

Stanford

Galapagos

Expedition.

A few

_{years ago} Dr. Paul Biolley of

San

_Jose, Costa Rica, visited the island,

and

several papers

have been

_published

on

the results of his _trip.

The Arachnida were

sent to

me

for examination,

and

_although

few

containjone ^or

two

interesting things.

The most _important

^is a

Phalangid

representing a

new

_genus.

There were

_{eight spe-}

cies in the collection, six spiders,

and two

Phalangids.

The

types^{are in} the collection of the writer.

ARANEIDA.

Gasteracantha hexacantha

Fabricius.

Several specimens ^of the usual _type. This is a widely ^dis- tributed _{species in} the _tropics.

Gasteracantha

biolleyi,

new

_species.

Cephalothorax ^black; legs and sternum black; abdomen _yellow, with black spines and marks; ^aband connecting the larger lateral spines,an oblong spot near base of anterior _spines, and a crescent each side in front; from the black band there is a mark _extending to the _posterior spines; ^all the _sigillae are on these black marks. Theventer ^is black, with

many

small yellowishspots. Inshape^itis

much

likeG. cancriformis,

OF WASHINGTON. 21

buttheposterior lateralspinesare largerand more recurved thaninthat species.

FIG. 7. Giisteracantlia_biolleyi.

Two

_specimens

^{from Cocos}

^Island collected

by

^{Dr. Paul}

Biolley.

Leucauge argyra

Walckenaer.

A few

_specimens ^ofthis

common

_{tropical spider.}

Leucauge

nigriventris Keyserling.

Taken by

^the

Hopkins-Stanford Galapagos

Expedition. ^It occurs also in northern

South America and

in the

Galapagos

Islands.

Theridium

_species.

A few

_specimens ofa small_species,with ashortyellow

abdo- men and

a black cephalo^thorax. Quite _possibly^itis new.

Ctenus

_species.

One immature

_specimen.

Lycosa

species.

Several

young

specimens.

PHALANGIDA.

Pellobunus, new

_genus.

NearSterrhosoma_Thorell, but _separatedtherefrom bythe slender_legs, withfewertarsal joints,andfewer spinesontibiaofpalpus,and by^absence

of clawtotarsus I.

22 ENTOMOLOG ICAL SOCIETY

Type:

^thefollowing species^:

Pellobunus

insularis,

new

_species.

Body

^{andmandiblesreddish;} palpiand_legsyellowish; thelatterbanded withblackonpatellae, tibiae, andmetatarsi; one atapex^offemur, oneat apexof patella,threeontibia(oneat base,onebeyond^middle,andoneat the_tip), two on metatarsus _{(one nearbase,} andone near thetip); some- times, also, bands on tarsi.

Two

ocelli separated by a broad, rounded tubercle; mandibles_large, butnot greatly^swollen. Legs^allslender, with

25S3GH^S^^3>

FIG 4 Pellobunusinsul.ris: a,palpus; b,tarsus III; c,tarsus I

; d, coxa

IV andbase ofabdomen.

rowsofshort_bristles;no clawto leg^I; tarsusIwith5joints; IIwith_{6 joints;}

IIIandIVwith 4joints each. Palpus^ratherslender,two_{spines, or}rather tubercles tipped with bristles, on each lower edge, andahookatbase on outeredge^; twosimilar bristleson eachloweredge^ofmetatarsus, theapical clawnearly ^aslong^{as last}joint.

Abdomen

with lastfour segmentsfree;

the dorsum with

many

^{transverse rows of short curved bristles; similar}

bristlesonthe venter. Length 3

mm.

One _specimen from Cocos

_Island, collected

by

^{Dr. Paul}

Biolley.

Cynorta

insularis,

new

_species.

Body

^richred-brown, a yellow spoteach sideovercoxae_II,four_{pairs of} small spotsⁱⁿdivergingrowsfrom_eyestoposteriormargin^ofdorsal shield,

anda_largeryellowishspotateachouter_apicalcornerofdorsal shield; legs

andpalpi yellowish. Basal_{joint of}mandibles roughenedabove,andtuber- culate on outer sides; eye-tubercle broad, low, and _smooth; two erect, acute, submedian _spines behind onthe edge ^of dorsal shield; dorsal seg-

OF WASHINGTON. 23

mentswith a transverserowofgranulesonmiddle, ventralsegments with rownear_posteriormargin; coxae stronglyand_{evenlygranulate; legs}with rowsof minute,^erect bristles; tarsus I of6_joints,the basal twice as long

FIG. 5 Palpus ofCynorta^insularis.

as _others; tarsus II of 13 joints, the basal scarcely as long ^as next two together; tarsusIII of6 joints,basalas long as next two_together; tarsus IV_{of 9joints,}basal nearly as long asnextthree_together. Length4.5

mm

^.

Two

_specimens

from Cocos

_Island, collected

by

^Dr.

^Paul

Biolley. This_speciesisrelated to C. quadripustulata,

but

with- out the _{large spots,} of "smaller _size, etc.

DECEMBER

i, 1904.

The

iQist regular

meeting was

^{held at the} residence of Mr.

Otto Heidemann,

700

Newark

street,

N.W.,

Vice-President

Hop-

kins in the_chair,

and

Messrs.

Ashmead,

Barber,

Ben

ton,Burke, Currie, Dyar,

Heidemann,

Morris, Piper, Quaintance, Schwarz, Scott,

and

_Titus,

_members, and

Messrs.

Couden,

^Girault

and

Strauss, visitors, present.

The

_following

new members were

elected:

Corresponding members,

^Dr.

W.

E. Britton,

Entomologist

^of the Connecticut Agricultural

Experiment

Station,

New _Haven,

_Ct.,

and

Messrs.

W.

_{J. Phillips}

and

G. I. Reeves, ^of

Urbana,

^{111. Active}

mem-

bers, Messrs. F. D.

Couden and

A. A. Girault, of the

Bureau

of

Entomology,

^{TL S.}

Department

of Agriculture.

Officersfor the year 1905

were

elected as follows: President, Mr.

Nathan _Banks;

First Vice- President, Dr. A. D.

Hopkins;

Second

Vice- President, Mr.

Otto Heidemann; _Recording

Sec- retary, Mr. Rolla P. Currie;

Corresponding

Secretary, Mr.

Frank Ben

ton; Treasurer, Mr. _J. D. Patten; ^additional

mem-

bers of the Executive

Committee:

Dr.

H.

_{G. Dyar,} Dr. L. O.

Howard and

Mr. C. L. Marlatt.