Perigona, 125 
Perigona dorsata, 127 
Perigona nigriceps, 126 
Perigona picta, 128 
Perigona tricolor, 126 
Perigona rufilabris, 126 
Pheidole clydei, 169 
Philanthus lepidus, 142 
Pholcomma, 32 
Pholcomma hirsutum, 37 
Pholcomma mantinum, 38 
Pholcomma micropunctatum, 37 
Platygasteridae, 8 
Poneropsis, 135 
Protelytridae, 183 
Protelytroptera, 183 
Pseudanophthalmus bielzi, 60 
Pseudanophthalmus calimanensis, 61 
Pseudanophthalmus meliki, 61 
Pseudanophthalmus pilosellus, 60 
Pseudanophthalmus rybinskii, 61 
Pseudanophthalmus transylvanicus , 
61 
Pycnoscelus surinamensis, 198 
Remarks on Sceliotrachelus Brues 
and Allied Genera (Hymenoptera, 
Platygasteridae), 8 
Review of the Calvertiellidae, with 
Description of a New Genus from 
Permian Strata of Moravia (Pal- 
aeodictyoptera), 153 
Sceliotrachelus, 8 
Social Behavior, 1 
Sphecidae, 142 
Spiders, 12, 32, 73, 174 
Stemmops, 73 
Stemmops bicolor, 75 
Stemmops, mellus, 79 
Stemmops orsus, 80 
Stemmops ornatus, 77 
Stemmops questa, 79 
Stemmops servus, 78 
Stemmops subtilis, 77 
Stemmops vicos A, 77 
Studies on Carboniferous Insects of 
Commentry France: Part VI. The 
Genus Dictyoptilus (Palaeodicty- 
optera, 104 
Studies on North American Carbon- 
iferous Insects. 3. A Spilapterid 
from the Vicinity of Mazon Creek, 
Illinois (Palaeodictyoptera) , 117 
Styposis, 32 
Sty po sis clausis, 36 
Styposis colorados, 35 
Styposis rancho, 36 
Styposis selis, 35 
Tardigrade, 41 
Taxonomy and Parataxonomy of 
Some Fossil Ants (Hymenoptera- 
Formicidae), 134 
The First Fossil Tardigrade: Beorn 
leggi Cooper, from Cretaaeous 
Amber, 41 
The American Spiders of the Genera 
Styposis and Pholcomma (Araneae, 
Theridiidae) , 32 
The Anatomical Source of Trail Sub- 
stances in Formicine Ants, 28 
The Habits of Pheidole ( Ceratophei - 
dole) clydei Gregg (Hymenoptera: 
Formicidae), 169 
The Spider Genera Stemmops , Chro- 
siothes, and the New Genus Cabel- 
lo from America, 73 
The Status and Affinities of Duvali- 
opsis Jeannel (Coleoptera: Carabi- 
dae), 57 
The Structure of the Protelytroptera, 
with Description of a New Genus 
from Permian Strata of Moravia, 
183 
Theridiidae, 12, 32 
Two New Species of the Genus Ac- 
cola (Araneae, Dipluridae), 174 
Tingidae, 65 
Trail Substances, 1, 28 
Trichognathus marginipennis , 52 
West Indian Carabidae X. Three 
More Species from Jamaica, In- 
cluding a New Cave Colpodes, 181 
Widow Spiders, 12 
248 
