198 
Psyche 
[Aug.-Oct. 
base of each antenna, is a muscle scar— i. e. it marks the attach- 
ment of muscles inserted upon the frons. 
Behind the frons fr is an area designated as the epicranium, or 
parietals pa, into which the epicranium is divided by the coronal 
suture cs formed by the basal portion of the Y- shaped epicranial 
suture bearing the labels cs and frs. The upper (apical) or dor- 
salmost portion of the head is the vertex — a region not clearly 
demarked in most insects. The postero-dorasl portion of the head 
in the region of the occiptial foramen ocf of Fig. 11 (i. e. the 
region bearing the label oc ) is called the occiput. 
The area situated below and behind the compound pye, bear- 
ing the label ge in Figs. 5 and 11, is called the gena. Its anterior 
limits are demarked by the frontogenal or suborbital suture fgs 
on each side of the frons, and its posterior limits are demarked by 
a suture or ridge, the postgenal ridge por (Fig. 11) which seper- 
ates it from the postgena. The basimandibular suture bms 
of Fig. 5 demarks the gena from the sclerite below it called 
the basimandibula, mandbiulare, or the triochantin of the mand- 
ible — i. e. the area bearing the label bm in Fig. 5. Comstock 
suggests that the region bm represents the trochantin of the limb 
forming the mandible, but the region in question was probably 
formed by a chitinization of the mandibular membrane between 
the base of the mandible and the head capsule. 
Behind the genae ge of Fig. 11, and seperared from the genae 
by the postenal ridges por are the postgenae pge, which form the 
greater portion of the posterior region of the head. A cup-like 
depression of the postgena, the postgenotheca pgt of Figs. 11 
and 12, receives a condyle of the mandible labelled h. A narrow 
median area labelled pes in Figs. 11, and 12, extends along the 
vento-median portion of the postgena, in the neighborhood of the 
mandibles and maxillae, and the cardo of the maxilla (cc of Fig. 
2) articulates with its postero-dorsal region. An area called the 
hypostoma becomes demarked in this region in certain Coleop- 
terous larvae, etc., but this area is not shown in the roach, nor is 
there a well defined gular region along which the postgenae usual- 
ly extend in Coleoptera and Neuroptera etc. 
The chitinized fold-like area labelled tf in Figs. 13 and 11 was 
termed the trophifer by Crampton, 1917, because the labium is 
