DESCRIPTIONS. 



15 



The fii'st thoracic segment is broad and long, being about equal 

 in length to the venter. The other thoracic segments are short, 

 being about equal in length to the first two abdominal segments. The 

 remaining abdominal segments are a little longer and quite similar. 

 The legs are short and armed with heavy, short brown spines. 



The abdominal segments are slightly constricted where they join 

 one another. There are from two to four hairs on the lateral side of 

 each segment. The spiracles are brown, conspicuous, and are 

 situated in a poorly defined, light lateral stripe. They are slightly 

 nearer the anterior end of the segment. 



The venter is depressed dorsally, with raised edges. It is sparsely 

 hairy around the edge. The caudal notch has a small tooth on each 

 side pointing slightly 



upward and backward. O aA 



The margin of the (/.n.l' 



notch varies from deep 

 brown to black. 



The average length of 

 the mature larva is from 

 18 to 21 mm., and the 

 width is from 2.5 to 

 3 mm. 



The Pupa. 



When first formed the 

 pupa is opaque white, 

 but after a time the 

 eyes show through as 

 pale, dusky, blue spots. 

 About this time the tho- 

 racic segments become 

 a pale waxy yellow, but 

 no other changes take 

 place untU shortly be- 

 fore emergence. 



The pupa (PI. Y.) very much resembles the adult beetle in shape, 

 except that the abdomen is slightly longer in the pupal stage. The 

 head is bent forward slightly, and each anterior angle is armed with 

 a long, heavy spine, which tapers regularly to a point. The mouth 

 parts are conspicuous. The antennae are laid along the margin of 

 the head on the ventral side, and their tips are behmd the tibiae of 

 the second pair of legs. On the underside of the head and near the 

 prothorax are two short, heavy spines. There are also two short, 

 stout spines on the dorsal side of the head near the posterior angles. 



The case covering the springing apparatus is plainly ^^sible 

 between the anterior coxae. The leg cases are folded similarly to 



Fig. 1. — The sugar-beet wireworm {Limonius cali/ornicus): a, Head; 

 6, anal segment from above; c, same, lateral view. Highly mag- 

 nified. (Original.) 



