DERMATOPTERA. 
307 
■which is oblong, widening in front, and with the surface slightly con- 
vex, and a praesternal area which is again subdivided into a median 
rounded area (Figs. 10-12, p si) flanked posteriorly by two small tri- 
angular sclerites (p' st). 
The mesostcrnum is scutellate in shape, nearly as long as broad, wide 
in front, narrow and well rounded behind the cox®. 
The metasternum is entire, very large, broad and rather full on the 
surface; it is as broad as long, encroaching on the pleurites, and behind 
is faintly separated by suture from the first urite. 
THE ABDOMEN. 
There are ten uromeres with ten urosternites (PI. XXIV, figs. 7-9); 
the 8th very large, being four times as long as the 7th ; the 9th and 10th 
each forming a pair of lateral scales, at base of each blade of the forceps, 
being separated by the median sclerites forming the genital armature. 
The genitals, forming a median, interforcipate, spine like sclerite, and 
present above and below, may represent the 1.1th uromere. The for- 
ceps we are inclined to regard as homologues of the cercopoda in other 
.Phyloptera. 
In regarding as the first uromere the tergite immediately succeeding 
what we have described as the meta-postscntellum, we differ from what 
seems to be Professor Westwood’s opinion as to the nature of the 
thorax. He apparently regards this segment or tergite and pleurite (as 
the sternal portion is not developed) as a part of the metathorax. This 
segment is a large, broad sclerite closely connected with the metatho- 
rax, being slightly excavated next to the metathorax, and rounded be- 
hind. On each side it is separated by suture from a narrow pleurite 
bearing the large, somewhat kidney-shaped first abdominal stigma. The 
first pair of abdominal stigmata is large and simple, the chitinous 
edge forming a plain ridge without any projecting teeth. The second 
pair of abdominal stigmata is visible ; the others are not easily detected, 
as they are minute, but judging by Westwood’s figures there are the 
usual number, i. e., eight pairs. Westwood states that there are three 
pairs of thoracic spiracles and seven pairs of abdominal ones. Should 
it be proved that Forttcula has a pair of stigmata to each thoracic seg- 
ment, it will be a remarkable fact, as there is no insect known (Campo- 
dea not excepted) which has a pair on each thoracic segment. But we 
are inclined to think that Westwood has considered our first abdominal 
uromere with its large spiracles as a part of the metathorax, and thus 
he considers the. number of pairs of thoracic stigmata as three, and of 
abdominal ones as seven. We have found a largo prothoracic spiracle 
over the coxa on the posterior end under the posterior corner of the 
pronotum, and concealed on the side by the lateral, scale-like epimerum. 
We have detected a pair of mesothoracic spiracles, but none on the 
metathorax. 
The result of our examination of Forficulkhe is that they constitute 
