﻿THE GRANARY WEEVIL 



13 



Prothorax dorsally not divided, but two areas, prsescutal and scuto-scutellar, 

 are roughly indicated by rows of setae. Prsescutal area with six pairs of setae, 

 the last two of which occur on the alar lobe, scutoscutellar area with four pairs 

 of setae. The thoracic spiracle is located on a lobe pushed into the prothorax from 

 the epipleurum of the mesothorax. It is bifore, elongate, larger than abdominal 

 spiracles, and placed with the fingerlike air tubes pointing dorsad. 



The mesothoracic and metathoracic segments are divided above into two 

 distinct areas, a spindle-shaped praescuturn provided with two pairs of minute 

 setae, and the scuto-scutellum and alar area. The scuto-scutellum has eight 

 pairs of setae and two pairs of hairs on each alar lobe. The epiplerum of the 

 mesothorax and metathorax bears a pair of setae. The sternum of the thorax 

 consists of a median area or eusternum and two lateral lobes more or less con- 

 nected medianly behind the sternum. The median portion is the sternellum 

 and the lateral portions are the parasternal plates. Each thoracic sternum 

 bears a pair of hairs, each coxal lobe of prothorax bears three pairs of hairs, and 

 each coxal lobe of mesothorax and metathorax bears five hairs. 



Each tergum of first four abdominal segments divided above into three distinct 

 areas, praescutum, scutum, and scutellum. Each tergum of fifth to seventh 

 abdominal segments divided above into only two areas, the first containing 

 praescutal and scutal elements, the second representing the scutellum. Below 

 these two areas and adjacent to the epipleurum is the alar area. Below a very 

 indistinct and abrupt dorsolateral suture and above a well-defined ventro- 

 lateral suture is a large, not subdivided epipleurum. The abdominal epipleura 

 are located considerably higher than the thoracic lobes. Below the ventrolateral 

 suture is the hypopleurum, subdivided into three lobes, one directly below 

 another. Below the hypopleurum is the coxal lobe and below that the sternum 

 consisting of the eusternum and a posterior triangular area representing the 

 parasternum or the parasternum fused with the sternellum. Abdominal segments 

 provided with setae, as follows: Each praescutum bears a pair of setae; each 

 scutellum bears three lateral setae; each alar area bears a pair of setae, and each 

 epipleural lobe bears a pair of setae. The second part of each hypopleural lobe 

 bears a seta, each coxal lobe bears a seta, and there is a pair on the eusternum. 



Eighth abdominal segment smaller than the typical segment; tergum declivous 

 and without distinct tergal areas; ninth segment rather small; tenth ventral and 

 very small. Abdominal spiracles placed anteriorly and in a small separate 

 corner piece, probably of the alar area; spiracles bifore and found on abdominal 

 segments 1 to 8, that on the eighth being located slightly more dorsad than the 

 rest. 



Measurements of larval stages 



stage 



Width of 

 larval head 



1 



Mm. 



0. 25 to 0. 20 



.36 to .37 



. 47 to . 48 



. 61 to . 65 



2. 



3 



4 





THE PUPA 



Pupa (fig. 8) uniformly white when first formed; length 3.75 to 4.25 mm., 

 width 1.75 mm. Tips of elytra attaining fifth abdominal segment, inner wings 

 rudimentary and almost completely (;oiiccaled l>y elytra. Tijjs of metathoracic 

 tarsi oxtendiiig beyond tips of elytra. Head rounded, beak elongate. Head 

 with two prominent spines toward vertex, a group of two small spines and two 

 Kpinulos on each side above eyes, two jjairs of small spines near anterior margin 

 and one on each siflc of front between eyes, tliree j)airs of K[)ii)es on beak between 

 frontal ones and base of antenna;, a pair of small ones on beak midway l)etween 

 base of antenna; and tip of beak, a pair on sides of b(;ak between latter pair and 

 tip of beak, and two pairs of ininufe spiries on tip of beak. Prothorax provided 

 with one pair of anterorruirginal scligcrouH tubenrles, one pair of atit(;rolateral, 

 two pairs of merliolateral, and four |)nirH of dorsal s(;tigen)us tiilxircles; also a 

 pair of miniitf: rnc;fliolaf cral ventral spines. MeHonotiim and m(!tanotiim nor- 

 mally each provided witli tlin;*; pairs of spines; one or irion; pairs oft<;n missing. 

 Abdomen with seven distinct dorsal tergites, the seventh b(!ing jimcli larger than 



