238 LEriDOrTEKA. 



convolutions. The colon is constantly of a large size, and is 

 often dilated into a ctTecum at its anterior portion." (Siebold.) 

 The salivary glands are composed of two simple tubes, whicli 

 are very large in the larval state, extending into the abdomen. 



The respiratory sj'stem is normal and well developed. In 

 the larva the stigmata are wanting on the second and third 

 thoracic and last abdominal segment. In those species of 

 yiSp h i n g idee, Bo m. bye i d ce and No c t u i d m , which have a 

 long-sustained flight there are numerous vesicular dilatations 

 of tlie tracheae. 



The urinary tubes are six in number ; they are long, free, 

 and open into the stomacli by two excretory ducts. 



The silk-glands consist of two long, flexuous, thick-walled 

 sacs, situated on the sides of the body, and opening by a 

 common orifice on the under lip (labium) usually at the 

 extremity of a short tubular protuberance (Siebold). They 

 are most developed when the larva approaches the pupa state. 



We once found a larva of Clisiocampa Americana that had 

 just spun its cocoon, and to ascertain whether the silk had been 

 exhausted, we removed the worm from its cocoon, when it spun 

 another, but thinner one ; and upon removing it a second time 

 it spun a third very thin cocoon, before the supply of silk Avas 

 entirely exhausted. 



The ovary consists of four very long, spiral, multiloculai- 

 tubes. The recejJtacidnm seminis is pyriform, and often has a 

 long, spiral ductus seinmalis. At its baee is situated a large, 

 double sebaceous gland ; and there are two small ramose 

 glands, perliaps odoriferous, situated at the orifice of tlie vagina. 

 The copulatory pouch is a remarkably large, pyriform reservoir, 

 having for the reception of the male intromittent organ a 

 canal, Avhieh opens by a special orifice, situated below and 

 behind the external opening of the oviduct. (Siebold.) 



The testes form two round or oval follicles, and the two 

 short deferent canals unite with two simple and very flexuous 

 accessory glands, to form the long ductus ejaculatorius. 



Several interesting cases of hermaphroditism in butterflies 

 and moths have been published by European entomologists. 

 Mr. Edwards has noticed two remarkable instances in the Pro- 

 ceedings of the Philadelphia Entomological Society (vol. Ia'. 



