97 
a ^t. AstaciUa. Begge staar hinanden yistuok megetnser; 
''I' 11 ( ^ ( ‘ t Bder sig dog gjore at opstille en Del distinctive 
lai.icterer, der ialfald for Tiden vil kunne tillsegges generisk 
‘Cid. 0 g jeg har derfor troet at burde holde disse 2 Slsegter 
ud fra hinanden. 
succeeding, viz. to the genus AstaciUa. Both do indeed 
approximate very closely; but a number of distinctive char- 
acters • can however be found that, leastways at present, 
have warrantable generic value: and hence I have seen fit 
to keep these 2 genera apart. 
20. Arcturus baffini, Sab. 
(PL IX, Fig. I— -21). 
Sabine, Appendix to Parry's Iste Voy. pg. ->0, PI. I, 
Fig. 4— li. 
j tv ^' r<: nlaUis, Latreille i Cuvier’s Regne animal, Vol. IV, pg. 1411. 
tH ' Us baffini, Westwood, Trans. Entom. Soc. Loud., Vol. I, pg- 
Artscharaeteristik. Legemet ovalt. loddent at korte 
jf St ' ve Haar. med en dobbe.lt Bad af koniske. opadrettede 
oitsatser langs ad Byggen. Epimereme paa de 3 bagerste 
°|kiopsseginenter trianguhert tilspidsede og staerkt udstaa- 
- Siderne. Sidste Bagkropssegment bagtil koniskt 
l(ll aget. med 2 triangulate Si defer tsatser ved Basis og 2 
^ 1 orner paa Midten af BygHaden. 0inene store og 
* ''instanende, af nyredannet Form og forsynede med morkt 
Ducat. Iste Par Foleres Svobe forsvnet med talrige 
’ andsevedhseng. 2det Par Fplere betydehg lamgere end 
j ( med Svoben sammensat af 8 Led. Farven lys 
Ulu?u l- Legeinets Lrengde indtil 40™”'. 
Findesteder. Stat. 48, 359. 
Beinserkninger. Nservarendo anselige Art er ferst 
^ ski even og afbildet af Sabine i Appendixet til Parry s 
, 7 * l ' or dpolexpedition. men er senere, saavidt mig bekjendt. 
* uuderka stet nogen fornyet l iiclersogelse, skjpndt den 
p 1 <ajl S e er gjenfunden og mevnt af mange forskjellige 
1)1 ktttere. Latreille's Skegt Arcturus er utvivlsom grundet 
} aa dl ‘ lme Art, hvorfor ogsaa det oprindelige Slsegtsnavn 
nf 1 lllaa auvendes. Den her oinhancQede Art er saaledes 
, •' 1 ’ 1 1 1 tor Shegten Arcturus og tillige for Familien Arc- 
turidie. 
Bcskriveise af Hunnen. Legemet er (se PI. IX, 
j 1 og 2) naesten af cylindrisk Form, omtrent 7 Grange 
g U '" eie one! bredt og er overalt loddent af korte og stive 
g aai ‘ * ,( ts Overbade er forpvrigt temmelig ujevn, idet 
‘ ogiuenterue er skilte ved temmelig dybe Indsnpriuger og 
Cls .'uede med afrundede Forhaininger og Fordybninger 
lll| t wed en Del symetriskt ordnede haie koniske Fortsat- 
tler danner en dobbelt Esekke langs ad Byggen. 
tntegumenterne er gtserkt incrusterede og viser overalt 
dot knudret eller grauuleret Sculptur. 
f Hovedet er omtrent af samme Brede som Laengde, 
• ne PP e afsmalnende og her mesten lige afskanret eller 
1 M| dten ganske svagt udrandet. Oventil er det forsvnet 
11,1 s k*' Nordlmvsexpedition. G. 0. Sai-s: Cnist.u-ea. 
20. Arcturus baffini, Sab. 
(PI. IX. figs. 1—21). 
Idothia baffini, Sabine, Appendix to Parry's First Voy. p. 50, PL I, 
figs. 4 — li. 
Arctums tnbmuhitua, Latreille. in Cuvier's Regne animal, Vol. IV, p. 139. 
Arcturus baffini , Westwood, Trans. Entom. Soc. Loud., Vol. I, p. 72. 
Specific Character. — Body everywhere clothed with 
short and stiff hairs, and furnished along the back with 
a double series of conical, upward - directed projections. 
Epimera on the 3 posterior pedigerous segments triangularly 
pointed, and prominently projecting at the sides. Last 
abdominal segment conically produced posteriorly, with 2 
triangular lateral projections at tin* base, and 2 small spines 
in the middle of the dorsal surface. Eyes large and pro- 
truding. reniform in shape, and provided with a dark pig- 
ment. Flagellum of 1st pair of antennae with numerous 
sensory appendices. Second pair of antennae considerably 
longer than body, with flagellum composed of 8 joints. 
Colour a light brownish - yellow. Length of body reach- 
ing 40™™. 
Locality. — Stats. 48. 359. 
Remarks.— The present large species was first described 
and figured by Sabine, in the Appendix to Parry’s First North 
Pole Expedition, but has subsequently, so far as I am 
aware, not been again submitted to any closer examina- 
tion. though several times met with and recorded by various 
authors. Latreille’s genus Arcturus is unquestionably founded 
on this species; and hence the original generic designation 
should be retained. The species treated of here is accord- 
ingly the type of the genus Arcturus, and likewise of tin- 
family Arcturid*. 
Description of the Female. — The body (see PI. 
IX figs. 1. 2) is almost cvliudric in form, about 7 times 
longer than broad, and everywhere clothed with long and 
stiff hairs. Its surface is, for the rest, rather uneven, the 
segments being separated by rather deep instrictions, and 
having rounded prominences and depressions, as also a 
number of symmetrically arranged, high, conical projections, 
constituting a double series along the back. 
The integuments are strongly incrusted, and exhibit 
everywhere a minutely rugged, or granulous sculpturing. 
The head has about the same breadth as length, tapering 
scarcely at all anteriorly, where it is abruptly truncate, 
or iu the middle, slightly pniarginated. Above, it exhibits 
13 
