Jan. i 5l 1921 Four Rhynchoph or a Attacking Com in Storage 607 



EGG 



Egg shining, white, ovoid in shape; top broadly rounded, bottom slightly more 

 pointed. Length about 0.56 mm., width 0.35 mm. 



LARVA 



Mature larva 4.5 to 6 mm. in length; white, footless, fleshy grub with body curved, 

 wrinkled, and profusely covered with long hairs. Head very pale straw color; anterior 

 margin and mandibles slightly darker. Head longer than broad, somewhat oblong in 

 shape. Epicranial and frontal sutures faint and slightly lighter in color; there are also 

 two longitudinal, light stripes rising from the frontal sutures and running to base of 

 head. Frons almost triangular in shape; frons and epicranial lobes provided with 

 numerous long hairs. Antenna small, situated at anterior corner of frons. Mandibles 

 large, stout, triangular, with apex produced into an acute tooth; inner edge toward 

 apex provided with two acute subapical teeth and above protractor with a large molas 

 process or structure. Dorsal area of each mandible armed with a pair of stout bristle 

 set close together. Eye represented by a well-defined black spot beneath the exo- 

 skeleton. Clypeus and labrum present, both broader than long and about equal in 

 breadth. Labrum provided with four pairs of dorsal hairs and five pairs of short, 

 thickened, marginal setae; ventral surface of labrum with four small setae. Maxillae 

 elongate, terminated by a 2-jointed palpus and a single setose lobe. Maxilla armed 

 with numerous long hairs and a stout chitinized seta on palpifer just below the maxil- 

 lary lobe. Stipes labii fused with the basal joint of the 2-jointed palps and bearing 

 two setae on each side. Ligula and lingua fused and marked by a seta on each side. 

 Linguar region with numerous small asperities and a few setae. Behind linguar region 

 is a strong hypopharyngeal chitinization connected on each side with epicranium 

 with well-developed hypopharyngeal bracon. Chitinization anteriorly provided with 

 a cavity the bottom of which bears pointed processes. Posterior part of hypopharyn- 

 geal chitinization less heavily chitinized and limited by a chitinized frame which 

 gradually continues over into floor of oesophagus. Mentum and submentum sepa- 

 rated, men turn bearing two long hairs and submentum nine pairs of long hairs arranged 

 in four groups of four each and a median pair. 



Pronotum simple and not divided. Mesothoracic and metathoracic segments are 

 above divided into three areas, representing praescutum, fused scuto-scutellar area, 

 and postscutellar area; below and adjacent to epipleurum is alar area. Below ventro- 

 lateral suture are hypopleurum, coxal lobe, and eusternum, all well-defined and 

 profusely provided with long hairs. Mesothoracic spiracle located on preepipleural 

 lobe of mesothorax near prothorax; larger than abdominal spiracles and differing 

 from them by being bifore whereas abdominal spiracles are monofore. Kidney-shaped 

 air tubes pointing dorsad. Ten abdominal segments: Ninth, small; tenth, reduced; 

 one to eight, each provided with monofore spiracles, that of eighth segment being 

 located slightly more dorsad and with air tube pointing cephalad instead of dorsad. 

 Praescutal and scutal areas of abdominal segments large and protuberant ; scutal area, 

 however, attenuating dorsad and not reaching the dorsal outline, scutellum and post- 

 scutellum flatter. Praescutum, scutum, and scutellum profusely armed with long 

 hairs. Epipleural lobes bulging and prominent, also well supplied with long hairs. 



Measurements of larval stages 



WIDTH OF 

 STAGE. LARVAL HEAD. 



1 o. 22 mm. 



2 34 mm. 



3 < 58 mm. 



4 78 mm. 



5 90 mm. 



