:;<; 



'Hill. 



ventricle is wide. The latter is a simple lube of uniform width. No ilei 

 A verj small, short coecunij as thick as the oesophagus, and hut little longer; 

 il is slightly dilated in the middle. The salivary glands arc large and well 

 developed, and when stretched mil arc about half again as long as the body. 

 1 1 nl arc folded up in short, close, sigmoid flexures, not in two long folds, as in 

 lepidopterous larvae. The urinary tubes arc about thirty in number and 

 rather short (there arc tour in Bombus larva'), emptying into the pyloric end 

 of the stomach. The coecum and posterior end of the alimentary canal are 

 much as in Ihiittnu and Zerene, there being no colon. 



Anatomy of the larva of a Phryganeid. — To show in what respect the 

 larva' of the Phryganeidte differ from lepidopterous larva', 1 introduce the 

 following notes made during the dissection of a larva of this family; the 

 genus unfortunately not determined. The salivary glands are very long, 

 filiform, and make a long fold opposite the pyloric end of the ventricle, 

 then, turning around at the anterior third ol the colon, they return, ending 

 at the pyloric end of the ventricle, extending, when stretched out. beyond 

 the body by one-fourth the length of the latter. The alimentary canal 

 is no longer than the body, not being convoluted. The oesophagus is 

 rather large, equaling in length that of the head. It dilates not very sud- 

 denly into the proventriculus, which latter is long and rather large, with 

 transverse prominent muscles. The ventriculus is about as long as, but con- 

 siderably larger than, the proventriculus, elongate-pyriform, thickest on the 

 anterior third; the surface is covered with thickened portions like a pave- 

 ment. The colon is dilated behind the ventricle into an oval region, about 

 three times as long as thick, suddenly contracting behind, and then dilating 

 toward the rectum ; the larger anterior region is about one-third as long as 

 the posterior. There are six long, slender urinary tubes, reaching, when 

 stretched out, to the head. 



§ 9. — Habits of the species. 



The geometrid moths have not a strong flight. When disturbed, they 

 rise from their resting-place on the upper or under side of some leaf, and fly 

 off in a weak, vacillating way, to light on' some neighboring leaf or trunk of a 

 tree. They seldom fly more than a rod or two. At rest, they usually spread 

 the wings almost flat, the hind body being nearly uncovered. 



The species are found in fields adjoining woods, and in forests. They 



