33G REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
epicranium, the very broad clypeus being indefinitely bounded behind, 
the front edge projecting over and concealing the short, broad labrum, 
and the edge thickened and tridentate. Mandibles of male enormous, 
their base partly covered by the clypeus. The gen® are very large and 
broad, bounded (in part) in front by the ante-antennal curvilinear foss®. 
The gula is solid, long, and narrow, extending from the occipital suture 
to the mentum, there being no submental suture; lateral sutures sepa- 
rate the mentum plainly from the gul®; submentum very broad. The 
occiput is present, appearing as a short and broad area, with a median, 
transversely-obloug sternite forming the base of the gula. (See larva.) 
Raphidia oblita , 154 (PI. LI, fig. 5-7.) Head as in Corydalus, but the 
vertex is longer in proportion and the clypeus, being smooth, is better 
limited. The ocelli are either present or absent, and there is no distinct 
area. The labrum is large, the clypeus not concealing it. There are no 
foss®. The gen® are very large, meeting over the gula, which is obso- 
lete, except in front, where it is broad and triangular, and forms a sub- 
mental region. The occiput is apparently well marked, forming the 
neck, and with a suture in front. 
THE THORAX. 
Notum. 
Pronotum ( Corydalus ). Large and square, about 
as long as broad; full in front and sinuous behind; 
somewhat hollowed in the middle. 
Raphidia. (PI. LIV, fig. 10.) Long and narrow, 
rectangular, very slightly excavated in front, and 
pointed behind. 
Mesonotum (Cory d aim. (Fig. 12). Prrescutum 
„ „ , , broadly subtriangular, shorter than in Raphidia, 
Pronotum of Corydnlus, ... ' ... , ,, 
enlarged. but more distinct. Scutum completely cleft, the 
pr®scutum and scutelluin touching; each division of the scutum sub- 
quadrate. Postscutellum large and long, very wide, and well devel- 
oped. 
Raphidia. (PI. LIV, fig. 11.) IT® scutum well developed, larger, 
but otherwise as in Corydalus. Scutum completely cleft, so that the 
pr®scutum meets the scutelluin; the latter shorter than broad, obtuse 
at the apex in front, being subtriangular. Postscutellum well developed, 
wide, and of nearly the same length throughout, but incised in the middle 
to receive the scutelluin. 
Mytanotum (Corydalus). Prmscutum much as in Raphidia, but 
smaller; scutum not entirely divided; scutelluin triangular, less acute 
in front than in Polystcechotes, but more so than in Raphidia. Post- 
scutellum well developed, transversely linear. 
161 Raphidia oblita Hagen, from California. 
