NEUROPTERA. 
339 
The orbits are large. The orbital fossae are round, but not so distinct 
as in Myrmeleon. The clypeus is as long as bi-oad, the sutures more 
distinct than in Myrmeleon; the median transverse ridge is more distinct 
than in Myrmeleon. The post- add anteclypens are nearly equal in size. 
Labrum as in Myrmeleon. The gala is broad, membranous. 
Mantispa.™ 7 (PI. LII, figs. 4-6.) The head is held vertically, and is as 
broad as long. The epicranium is broader than long, rather flat, with no 
V-shaped suture or ocellar area. The clypeus is large, very distinct, 
nearly as broad as long, square at the 1 ase, but constricted in the middle. 
The labrum is large, broader than long, much rounded and produced in 
front. The genes are broad, and the gular region is rather narrow, but 
moderately so compared with Corydalus. The submentum (?) is large, 
and nearly as long as broad. The ligula is very large and long, spatu- 
late, not divided, and very simple compared with Corydalus. 
THE THORAX. 
Notum. 
Tn Ascalaplms the pronotum (PI. LVI, fig. 1) is short and small, 
divided into two halves by a deep median suture. In its shape it 
approaches that of the Odonata more than any other true Neuroptera. 
Myrmeleon. (PI. LIV, fig. 1.) It is square, much excavated behind 
and full in front, a little narrower than long. 
Polystcechotes. (PI. LVII, fig. 8.) It is one-half as long as broad, and 
is alittle excavated in front and behind. 
Mantispa. It is very long, being twice as long as its greatest breadth, 
Bubpyriform in outline, nearly twice as broad in front (full on the front 
edge) as behind. It is excavated behind (PI. LV, fig. 1). 
The mesonotum. Ascalaphus. (PI. LVI, fig. 2.) The praescutum is 
large with the central portion subcordate, larger than in Myrmeleon. 
The scutum is almost entirely divided. Scutellum large and swollen, 
apex very obtuse; the postscutellum forms a transverse, flat ridge. 
Myrmeleon (PI. LIV, fig. 2.) Rectangular in outline. The praescutum 
is very large, as long as broad, and much as in Polystcechotes. The 
scutum is not deeply cleft, the median third being entire. The scutel- 
lum is small, subtriangular, broad, and with the apex obtuse, while the 
side sclerites are large, as in the metanotum. Postscutellum? 
Polystcechotes. (PI. LVI, fig. 9). The praescutum is very large, being 
nearly as large and wide as the scutum, and divided by a median furrow ; 
each half full and rounded in front. The scutum is completely cleft, the 
pnescutum and scutellum touching ; each side of the scutum is squarish. 
The scutellum is broader than long, very acute, being produced in front, 
forming a long point. The postscutellum is rather large and very wide, 
being divided by a median suture. 
Mantispa. (PI. LV, fig. 2.) Praescutum minute, nearly obsolete, not 
167 Mantispa brunnea Say, from Utah; identified by Dr. Ilayou. 
