Supplement to the New England Spiders. 175 
cause it seems to me to show as well as any other the natural 
relations of the species which I have been studying. 
At the beginning of the series come two species which | have 
described in N. E. Therididae under the name of Pholcomma at 
the end of the 7heridide. P. hirsuta belongs to a genus near Phol- 
comma, which Simon in Hist. Nat. Araigneées has named An- 
cyllorhanis. It has small mandibles and the pointed maxille and 
the simple male palpi of the 7heridide. P. rostrata belongs to 
quite a different genus, which Simon has called Histagonia, and 
I have adopted without having seen /7. deserticola, the type species 
Another species of the same genus is the Exechophysis palustris 
Banks. Histagonia seems to me most nearly related to. Diplo- 
cephalus rather than to Pholcomma. The mandibles and maxille 
are like the Erigonew rather than the Theridid@, and the modi- 
fications of the head and complicated form of the tibia of the male 
palpi resemble those of Diplocephalus. The tarsal hook is present, 
though small, as it is in Diplocephalus. 
The new genus Caseola with two species herbicola and alticeps 
resembles in form and habits Ceratinella, but does not have hard 
pieces on the back and at the base of the abdomen, nor any of 
the orange color of Ceratinella. The male palpi are simple in both 
species, with a peculiar club-shaped process of the palpal organ 
directed toward the inner side. 
Ceratinella consists of small round spiders, orange-colored or 
orange brown, with a hard plate on the back of the abdomen in 
one sex or both. The palpi of the males vary in length, but are 
all on the same plan, with the palpal organ furnished with a long 
slender tube turned backward from the distal end of the tarsus 
toward the base. I consider this genus to include the European 
C. brevis and the American species which Simon separates as the 
genus Ceraticelus, the principal difference being in the sinuous claw 
of the mandible of C. brevis. Ceratinopsis consists also of small 
and brightly colored spiders with usually distinct black markings 
on the head and sometimes on the palpi and feet. The palpi 
resemble those of Ceratinella, with large and more variable tibie. 
There are no hard plates on the abdomen. 
Cornicularia includes species resembling Ceratinopsis, but with 
usually more elongated cephalothorax, and in the males a horn on 
the front of the head between the upper and lower middle eyes. 
The male palpi have the tibia enlarged and extended over the back 
of the tarsus in a long flat process, partly divided into two branches. 
I include those species which have a double horn on the head, 
