Jan. 15, 1921 Four Rhynchophora Attacking Corn in Storage 61 1 



EGG 



Egg opaque, shining white, ovoid to pear-shaped in form, widest below middle, 

 bottom broadly rounded, neck narrowing sharply toward top which is somewhat flat 

 and bears a small rounded protuberance that fits into a cap or plug that cements the 

 egg into place. Length 0.65 to 0.70 mm., width 0.28 to 0.29 mm. 



LARVA 



Mature larva 2.5 to 3 mm. in length, a pearly white, fleshy grub; very thick-bodied, 

 ventral outline being approximately straight while dorsal outline is almost semicir- 

 cular. Head light brown in color, anterior margin and mandibles much darker. 

 Head longer than broad and somewhat wedge-shaped, sides broadly rounded from 

 middle to apex, which is slightly angular. Sides nearly "straight from middle to 

 anterior angles, lateral area with an oblique, longitudinal, lighter stripe or area. Epi- 

 cranial and frontal sutures distinct and light in color; also two oblique, longitudinal, 

 light stripes rising from the frontal sutures and coalescing with the epicranial suture 

 near base of head. Frons subtriangular with a distinct, dark median line indicating 

 carina, running from posterior angle to beyond middle. Sutural margins irregular 

 or sinuate. Frons provided with five pairs of large setae, sutural margins each bearing 

 a large seta. Each epicranial lobe with the following setae: One close to posterior 

 angle of frons and located within oblique longitudinal stripe rising from frontal suture, 

 one very small seta posterior to this and near occiput, two anterior to it on disk of epi- 

 cranium, two opposite middle of frons, one opposite middle of mandible, one opposite 

 hypostomal angle of mandible, and one on hypostoma near base of mandible. Epis- 

 toma represented by thickened anterior margin of front, distinctly darker in color, 

 with anterior margin declivous and slightly curving and lateral angles slightly pro- 

 duced and elevated where they support dorsal articulation of mandibles. Pleuro- 

 stoma represented by darker declivous area surrounding mandibular foramen. Man- 

 dibles stout, triangular, with apex produced into a broad apical tooth; inner edge 

 toward apex provided with a subapical tooth and a small medial tooth; no molar part. 

 Dorsal area of mandible provided with a pair of stout bristles set apart. Eye repre- 

 sented by a well-defined black spot beneath exoskeleton. Clypeus attached in front 

 of frons and broadly transverse; broad at base, sides narrowing toward apical angles, 

 slightly longer and broader than labrum, and bearing on epistomal margin two fine 

 setae on each side. Labrum distinctly broader than long with two small lateral and a 

 larger rounded median lobe. Labrum provided with six large setae behind middle, 

 two marginal, short, thickened setae on each of lateral lobes, and six similar marginal 

 setae on median lobe. 



Maxilla with cardo present and distinct, stipes not divided into stipes proper, 

 subgalea, and palpifer, but one continuous piece with the anterior inner angle pro- 

 duced into a single setose lobe. Palpus 2-jointed, bearing a single seta near apex of first 

 segment. Three other setae found on maxilla, two located on vaginant membrane be- 

 tween palpus and palpifer and one stouter and longer midway between palpus and 

 cardo. No articulating maxillary area between maxilla and mental-submental region. 

 Labium with submentum and mentum fused and represented by a broad lobe bearing 

 three pairs of stout setae. Stipes labii posteriorly enforced by a median, triangular 

 chitinization, the anterior median section produced anteriorly between the palpi into 

 a small lobe-like ligula which is fused with the lingua. Each stipes labii bears a single 

 seta. Short, conical, 2-jointed palpi situated on anterior angles of stipites. Ligula 

 bearing four small setae. Prothorax not divided dorsally, but two areas, praescutal 

 and scuto-scutellar, roughly indicated by rows of setae. Mesothoracic and metatho- 

 racic segments divided above into two distinct areas, the anterior of which repre- 

 sents praescutum, and the posterior the scuto-scutellum and alar area. The thoracic 

 spiracle is located on a lobe pushed into prothorax from epipleurum of mesothorax. 



