THE CANADIAN ENTOMOLOGIST 39 



mine into the soft sand, and by continual turning round and 

 round or moving back and forth gradually construct its 

 chamber. 



Although I was fortunate enough to find all the stages of this 

 beetle, I did not learn anything of its ways in the nearby river. 

 They must have been abundant, for the pupal chambers were 

 •observed at various places for nearly a mile along the river bank. 



Description of larva. 



Full-grown larva (pi. 1, fig. 3) ready to pupate, measures 

 5.3 mm.; caudal setae 2 mm. additional; head 1.04 mm. 



General colour brown above, nearly pure white beneath. 

 Head yellowish brown, a V-shaped brown spot on vertex, the apex 

 directed caudad. Head measures 1.04 mm. long and .9 mm. at 

 its widest part just behind the eyes. Rostrum .16 mm. long, 

 rounded in front, smooth and without setae on margin. Antennae 

 yellowish brown, 4-jointed; 1st joint, .12 mm.; 2nd joint, .2 mm.; 

 3rd, .2 mm.; 4th, .08 mm. A few scattered setae present on the 

 head, the lateral margins just behind the eyes bearing several 

 larger setae. Mandibles are long, sickle-shaped, perforated to 

 their upturned tips, which rest against the lower surface of the 

 rostrum, yellowish at base, becoming brownish yellow at their 

 tips. The perforations run along the inner sides of the mandibles 

 (fig. 9, D). The maxillae (fig. 9, A) are greatly reduced, consisting 

 only of a 4-jointed palpus; 1st joint, .33 mm.; 2nd, .65 mm.; 3rd, 

 .5 mm.; 4th, .2 mm. The labium (fig. 9, B) is small, quadrangular 

 in shape, emarginate in front, with 4 setae, two long ones arising 

 from the inner surface and two shorter ones on the lower surface, 

 just mesad of the point of origin of palpi. The palpi are two- 

 jointed and arise from the outer angles of the labium, 1st joint, 

 .76 mm.; 2nd, .5 mm. Eyes 6 in number, arranged in two trans- 

 verse rows. 



The prothorax is yellowish brown in colour, with a dark brown 

 spot on each side of the middle line, near the posterior margin. 

 The remaining segments are yellowish brown in colour, with a 

 lateral row of lighter yellow spots on each side of the middle line, 

 extending back to the seventh abdominal segment. These spots 



