86 Psyche [June 
by Newport to specimens from St. Vincent. The types of M. 
parvus are small slender specimens, near 20 mm. in length. The 
cephalic plate is proportionately broader than in the other species 
mentioned, being from 1.61 to 1.63 times longer than wide; whereas 
in guildingi it is from 1.98 to 2.1 times longer than wide, and in 
the Javan species (for which Meinert’s name cephalotes must prob- 
ably be resurrected) from 1.68 to 1.71 times longer, while careful 
micrometer measurements of numerous specimens of punctifrons 
from India showed the cephalic plate in adults to vary from 1.88 
to 1.91 times longer than wide, the plate in partly grown speci- 
mens being near 1.85 and in the youngest ones 1.8 times longer 
than wide. 
3. Pectiniunguis albemarlensis Chamberlin. 
This species is very close to P. americanus which is apparently 
common on both the Pacific and eastern coasts of Mexico and has 
been taken on the Florida Keys. The Galapagos species has near 
the same number of legs (61 pairs) as americanus and is also marked 
with a similar geminate dark stripe along the dorsum. The head 
is distinctly broader, the ratio of length to breadth in the type being 
57: 52, while the basal plate is longer, being but 2.5 times wider 
than long as against 3 times in americanus. The ventral pores 
are more numerous and the area occupied on each sternite ma- 
terially greater. Of the two other known species of Pectiniunguis 
as now restricted, one is from Cuba and the other from Colombia. 
In California occur several species of a related genus which I have 
recently named Nyctunguis. One female of P. albemarlensis was 
secured on Albemarle Island at Iguana Cove (December, 1898). 
4. Cryptops navigans Chamberlin. 
Two specimens taken on Clipperton Island November 23, 1898. 
~ 
5. Scolopendra galapagoensis Bollman. 
Specimens of this species were taken on Hood, Chatham, Bindloe, 
Narborough and Albemarle Islands. It seems to be much the 
commonest chilopod of the Archipelago, being the only one in 
fact that was taken on more than one island. Its affinities seem 
to be closest to the group of the division Collares occurring in the 
warmer parts of America. 
The new diplopod Nesodesmus is a member of the Pyrgodes- 
mide. 
