IOWA ACADEMY OF SCIENCES. 211 



Adult Fig. 10. (a, dorsal view; b, side view; c, tarsus.) 

 Widest at base of elytra and tapers strongly toward either end; 

 shining black, glabrous; numerous medium sized punctures 

 on the thorax and between the str;^ of the elytra. Snout 

 about 1-24 inch long, curved, usually extending directly 

 downward, but sometimes drawn backward or slightly pro- 

 jected forward. Thorax narrows perceptibly toward the head. 

 Tarsi strongly pubescent beneath, claws strongly curved, 

 diverging. Elytra emarginate at tip, making the tip of 

 abdomen more distinctly visible from above. 



REMEDIES. 



Collecting and burning the old root-stocks and stems in early 

 autumn will be the most effective treatment that can be sug- 

 gested from present knowledge of the species. 



AN INSECT OCCURRING IN WATER TANKS AND RESERVOIRS. 



{Chifonomus sj) ) 

 Early in July I received some specimens of a slender red 

 larva from Boone, with the following letter: 



Professor Osborn: 



Dear Sir— Enclosed I send a sample of the worm that appeared in our 



city water about a week ago in countless numbers. Would like to know 



what they are and where they would be likely to come from. The water we 



use comes from a 3,0J0-foot well, but about two weeks ago our pumps failed 



and we were supplied with water from a forty-five foot vein owned by the 



C. & N. W. Ry. Co., and pumped to our reserv^oir through a hose. 



Yours truly, E. E. Chandler, 



Chairman Water Committee. 

 Boone, Iowa. 



The lirv99 were evidently Ghironomus, and in replying to the 

 letter it was so slated and that in themselves they CL/uld be 

 considered harmless, though of course the presence of masses 

 of such ugly looking creatures would be objectionable, and if 

 dying in the water they wight become a suurce of pollution 

 Also that the larv^ must have gained access to the water from 

 the eggs of the adult mosqaito-like insect beicg deposited in 

 the reservoir or the mains by which it was filled. They could 

 not be derived from a deep well. It was suggested that pro- 

 vision be made to exclude the insects from the water to prevent 

 deposition of eggs. 



The larv« (Pig. 12) a and h , which are an inch or a little 

 more in length and of a light red color with green reflections 

 on the sides near the head, construct a tube at the bottom of 



