May 31, 1924 
The Cambium Curculio 
381 
Head light yellowish-brown, the anterior margin and mandibles much darker. 
Head, with labium and clypeus included, subquadrate, the width but slightly 
greater than the length. Width of head about 1.06 mm. Epicranial and 
frontal sutures distinct. 
Fro ns subtriangular, with a dark riiedian line indicating the carina extending 
about two-thirds of the distance from the posterior angle to the anterior margin 
of frons. Near anterior margin of frons on each side a group of two setae with 
a sensory spot between. Setae and sensory spot arranged in a straight, trans¬ 
verse line. In posterior angle of frons on each side two setae with sensory spot 
between arranged in a longitudinal curved line. 
Clypeus broader than long, sides narrowing sharply to apical angles. 
Epistomal suture with two fine setae and an intermediary sensory spot on each 
side. Labrum subtriangular, broader than long, with three pairs of dorsal and 
six pairs of marginal setae. 
Each epicranial half with thirteen setae and three sensory spots arranged as 
shown in Plate 2, H. One inconspicuous ocellus on each side. Antenna small, 
fleshy, two-jointed; basal joint with several small papillae. 
Mandibles stout, subtriangular, slightly bifid at tip, excavated along the 
irregularly serrated cutting edge, no molar part, dorsal area with two setae. 
Maxillary mala entire, tip obtuse, dorsal and ventral surfaces smooth. Dorsal 
surface with a longitudinal row of eight unbranched, stout setae. Ventral surface 
with four setae and a sensory spot near tip. Maxillary palp extending slightly 
beyond mala, two-jointed, borne by large membranous palpifer; proximal joint 
thick, cylindrical, bearing two sensory spots and with a small seta on the apical 
membrane; distal joint fingerlike, bearing several small terminal papillae. 
Three other large setae on maxilla, two of them near base of palpifer and the 
other about midway between palpus and end of cardo. A very minute seta 
with a sensory spot near stipes labii but usually concealed by the folded skin. 
Mentum, submentum, and maxillary articulating area fused into a fleshy lobe. 
Three pairs of setae. Eulabium posteriorly enforced by a medium, triangularly 
bent chitinization. Between the palpi a small lobelike ligula. Labial palp short, 
conical, two-jointed; distal joint with several small terminal papillae. Eulabium 
bearing two small setae and two sensory spots on ventral surface. Ligula with 
two pairs of small setae and two sensory spots. Floor of buccal cavity composed 
of a fleshy hypopharynx laterally somewhat spinose and strengthened with small 
lateral chitinizations (not shown in figure). Hypopharyngeal bracon whitish 
and band-shaped, loosely connected with thin chitinizations laterally on hypo- 
pharynx. 
Epipharynx carrying a pair of epipharyngeal rods. Between the rods two pairs 
of small, stout setae and a pair of three-lobed sensory spots. Prothorax dorsally 
not divided, thoracic plate lightly chitinized and provided with eight pairs of 
setae and two pairs of sensory spots. First thoracic spiracle pushed into pro¬ 
thorax but located rather far from anterior prothoracic margin; elongate, bifore, 
with the fingerlike air tubes pointing dorsad; at least twice as large as abdominal 
spiracles. Mesothoracic and metathoracic segments above divided into a spindle- 
shaped praescutum, a scuto-scutellum, and an alar area. Praescutum with one 
pair of setae, scuto-scutellum with four pairs, and each alar area with one seta. 
Sternum of thorax consisting of th€ eusternum with the presternum depressed 
in front of it, a coxal lobe on each side, the sternellum, and thejDoststernellum. 
Eusternum of each thoracic segment bearing a pair of setae. 
First seven abdominal segments divided into praescutum, scutum, scutellum, 
postscutellum, and alar area. Praescutum bearing a pair of setae, each scutellum 
five setae, and each alar area one pair of setae. Below the tergal areas is the 
epipleurum w T ith two setae, the hypopleurum with two setae, the coxal lobe 
with one seta, and the eusternum with two pairs of setae. Eighth abdominal 
