842 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
The mesostefnum is triangular, cordate, one-half as long as wide in 
front; distinctly separated by suture from the infra-episteruite, with 
a deep median furrow. The meta- as the mesosternite, but one-third as 
long. 
Mantispa. The prosternum is very long and narrow, and is well de- 
veloped. The mesosternum is large, broad, about one-third as long as 
broad; not distinctly separated by suture from the episteruum; in this 
respect the metasternum is the same. 
THE ABDOMEN. 
Ascalaphus. (PI. LVII, figs. C, 7.) The abdomen is moderately long, 
spindle-shaped, with nine uroxneres. 
Myrmeleon. (PI. LVII, figs. 8-10.) Very long aud slender, more as 
in Odouata than other Neuroptera, being slender, cylindrical. There 
are seven well developed tergites; the 8th and 9th small, the 9th being 
as long as broad. The pleurites are broad, well developed, membranous; 
the spiracles distinct. Of the nrosternites the first is obsolete, followed 
by six well-developed ones; the 7th well developed, oblong. The $ 
claspers are well developed, and are much as in Odonata. 
Polystoechotes. (PI. LVIII, figs. 2-4.) The abdomeu is much shorter 
and thicker than in Myrmeleon. There are ten tergites; the 2nd subdi- 
vided into two subtergites, appearing as if two tergites ; the 8th is one- 
third as long as the 7th ; the 9th one-half as long as the 8th ; the 10th is 
broader than long, the end being subconical. The pleurites arc broad, 
membranous, six pairs of spiracles visible. There are seven urosternites, 
the first membranous and obsolete; the seventh longer than the sixth. 
Ho uropods; the cercopoda rudimentary. 
Mantispa . — Broad and large, nine uromeres; the first tergite very 
short; ninth uromere very short, with very short uropoda i 
Family PANORPIDiE. Plate LX. 
THE HEAD. 
Panorpa . 15 “ (PI. LX, figs. 1-3.) No true occiput. The epicraniuin is 
swollen on- the vertex, which is as long as broad; there is a small ocellar 
area, and a small inter-antennal area. The front of the head is remark- 
ably elongated, and is formed by the great development of the clypeus. 
The labrum ? The geuai form an elongated tract, and the gala? 
The submeutum is a little longer than the mentum, while the lingua 
is short. 
The antennae are very long and many-jointed, as in moths, and the 
minute mandibles are situated at the end of the snout. 
,68 0n sending tin; specimen, alter dissection, to Professor Hagen, he kindly informs mo that it is 
“perhaps P. debilis Westw.” 
