202 
Psyche 
[September 
VerhoefFs, it is apparent that Insulocambcila must be considered a 
junior subjective synonym of Eumastigonus (new synonymy!). 
There is some doubt about the provenance of E . insulanus. At- 
tems stated only “Stephens Island (Dr. Schauinsland coll, ic?).” 
It is known that Schauinsland did make collections along the coast 
of western North America, and there is a Stephens Island near Prince 
Rupert, British Columbia, which I judge is the implied type locality. 
But in view of the obvious congenericity of insulanus with the New 
Zealand species named by Chamberlin, it seems implausible to me 
that the type really originated in North America. I would rather 
prefer to suspect some mixup in labeling either by the collector or 
by Attems, and that the material really came from North Island, 
New Zealand. An alternative possibility is that specimens of a New 
Zealand species might have been incidentally introduced through 
commerce and become established. It would be a zoogeographic mile- 
stone if it were ever proven that a Eumastigonus is really endemic 
to Stephens Island. 
Eumastigonus distinction Chamberlin 1920 
Figures 1-5 
Bull. M. C. Z., 64: 164. Holotype, MCZ 4872, from Day’s Bay near 
Wellington, North Island, New Zealand (W. M. Wheeler). 
The first pair of legs of the male is somewhat reduced in size, 
with the coxae prolonged laterad. The podomeres distad to the pre- 
femur are nearly as wide as long, and the tibiotarsus (Fig. 1, tt) is 
apically rounded, without a claw. The anterior gonopods terminate 
distally in four processes, one of which represents the telopodite al- 
though I could not see a clear articulation with the coxa at its base. 
These processes are labeled a, b, and c, and the apex of the telopodite 
dj on the drawings. Process a corresponds to what Chamberlin called 
the “distomesal process”, b to his “membranous lobe”, and c to his 
“pectinate lobe”. From a caudomesal aspect (Fig. 2) it is evident 
that processes b and d form a sort of envelope in which the posterior 
gonopod can be accommodated. The prominent coxal flagellum, 
from which the generic name was derived, is apically penicillate. The 
Figs. 1-5. Eumastigonus distinction Chamberlin, from male holotype. 
Fig. 1. First pair of legs, gnathochilarium, and part of mandible, right 
side, aboral aspect. Fig. 2. Gonopods, oral aspect (left posterior gonopod 
not shown). Fig. 3. Right anterior gonopod, oblique caudomesal aspect. 
Fig. 4. Right anterior and posterior gonopods, lateral aspect (tracheocoxal 
muscle shown, others removed for clarity). Fig. 5. Apical third of right 
posterior gonopod, oral aspect, showing apparent basal articulation of an- 
terior distal process (telopodite?). 
