vpiilricic is wide. The liiltcr is ;i siui|ilr fiibc ol' iiiiiloriii widlli. No ileiiin. 

 A very small, sliorl (•(rcuiii, as thick as the (I'sopliagiis, and Imt liltic longer; 

 it is slightly dilated in tin- middle. The .salivary glands are large and well 

 developed, and w hen stretehed ont are al)out halt' again as long as the body, 

 but are folded np in short, close, sigmoid tlexures, not in two long folds, as in 

 lepidopterous larva;. The urinary tubes are about thirty in number and 

 rather short (there arc; ibur in Bombus larvas), emptying into the pyloric end 

 of the stomach. Th(> coecum and posterior end of the alimentary canal are 

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



Aiiatomy of the larva of a Plinjgaii(}d. — To show in what respect the 

 larvae of the Pliryganeidce dittei' from lepidopterous larvte, I introduce the 

 tbilowing notes made during the dissection of a larva of this liimily ; the 

 genus un{()rtunately not determined. The salivary glands are very long, 

 filiform, and make a long fold opposite the ])ylnric end of the ventricle, 

 then, turning around a1 the anterior third of the colon, they return, ending 

 at the pyloric end of the ventricle, extending, when stretched out, lieyond 

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

 is no longer than the Ixxly, not l)eing convoluted. The oesophagus is 

 rather large, efpialing in leuiffh that of the head. It dilates not very sud- 

 denly into the j)roventriculus, which latter is long and rather large, with 

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

 siderably larger than, the proventrieidus, elmigate-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 ttmes 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. '^^IMiere are six long, shuider urinary tubes, reaching, when 

 stretched out, to rhc head. 



§ !). — llABrr.s or the species. 



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

 rise from their resting-place on the u])per or under side of some leaf, and fly 

 oil" in a weak, vacillating way, to light on some neigJiboring leaf or trunk of a 

 tree. They seldom fly mor(> than u rod or two. At rest, they usually spread 

 the wings almost flat, the hind body Ix'ing nearly uncovered. 



The species are found in fields adjoining woods, and in forests. 1'hev 



'■pl 



