PSEUDONEUROPTERA. 
323 
fourth as long as broad; eyes on each side; no orbits; the ocellar area 
separated from the vertex by a well-marked suture, broad, somewhat V- 
shaped. Separated from the third area in front by a deeply-impressed 
line. 
Clypeus narrow, one-half as long as wide, with a narrow projection 
in front. Labrum small, narrow, short, and partly fleshy. Geuaj -of 
moderate extent. Gula but slightly developed; mentum short, distinct 
from the submentum. 
THE THORAX. 
Notum. 
Pronotum (Pteronarcys californica). (Id. LVII, fig. 1.) Broad and 
Square, nearly as long as broad. 
Mesonotum ( Pteronarcys californica). (Fig. 2.) Prmscutum sub-cor- 
date, rhomboidal, with the posterior half triangular, divided by a deep 
mesial impressed line; anterior half smooth and swollen. Patagia (?) 
large and broad. 
Scutum very peculiar. It is broader than long, with two large lateral 
bosses in front, apparently corresponding to the two halves of the scu- 
tum in the Neuroptera metainorphotica, and between them is a broad, 
slightly convex area, which might be regarded as the anterior part of 
the scutellum, but judging by the limits of the metascutellum it is not. 
Scutellum short and broad, well marked behind, but in front insen- 
sibly merging into the central flat area of the scutum, with no indica- 
tions of a suture. 
Postscutellum, forming a transverse linear ridge of even width 
throughout, with very slight indications of an impressed line along the 
middle of the body. 
Metanotum. (Fig. 3.) Exactly repeats the form of the mesonotum, 
and is, if anything, a little longer than the mesonotum (the hind wings 
being considerably larger). Only the posterior half of the prmscutum 
in the mesonotum is represented in the metanotum, i. e., the cordate, 
roughened portion, with the mesial suture. The lateral bosses of the 
scutum are as far asunder as in the mesonotum. Scutellum crescent- 
shaped; the suture in front is distinct, whereas in the mesonotum it is 
obsolete. 153 
Postscutellum a little larger behind the scutellum than in the meso- 
notum. 
Behind the metapostscutellum is a long, transverse, rather broad mem- 
brane which connects the metanotum with the abdomen. It is not the 
first abdominal segment. 
Pleurum. 
Propleurum {Pteronarcys californica). (Pl.XLIY, Fig.l.) Episternuiu 
and epimerum both nearly equally developed; the former subtriaugular, 
the latter subquadrate, and each in part semi-membranous. 
,M In Acroncuria abnorjni# the meso- and motascutellum are not separated by suture from the 
scutum. 
