THE ENTOMOLOGIST. 155 



described them as having *a most striking resemblance to 

 those of Paraponyx stratiotalis.' Herrich-Schliffer, in the 

 same year, figured the female specimen on ivhich Mbschler 

 based the species A. latipennis, and he depicts her tvilh a 

 string of eggs at her tail. M^ Lad dan has shown me one of 

 his Hampstead examples with a similar string ; and Knaggs 

 has a continental A.latipemiis with eggs attached. In these 

 cases, the colour of the egg is dirty white, or yellowish ; and 

 the shape is ' roundish,' rather than ' very elongate.' 



" The larva is of a light green colour, and like those of 

 Hydrocampa, Paraponyx, and Cataclysta, it lives on aquatic 

 plants below the surface ; it has gills, and lives freely in the 

 water. It has been figured by Brown. It appears to feed 

 exclusively on the pond-weeds, but has been found on several 

 species; thus Kolenati (who, however, was acquainted with 

 the imago only) mentions Potamogeton heterophyllus and 

 perfoliatus ; Brown and Heinemann mention P. pectinatus 

 and perfoliatus; Ritsema mentions P. crispus; and Milliere 

 mentions P. pectinatus and lucens. When fully fed, in June 

 or July, the larvae may be found ' in silken cocoons, which 

 are strengthened by small pieces of the leaves incorporated 

 longitudinally in the fabric, and which are placed in the 

 submerged axils ' of the thread-like leaves of the Potamogeton. 

 Brown found only fully-ied larvae, but Ritsema and Reutti 

 found them in various stages of growth. 



" The pupae are described by Brown as ' of the masked 

 character, and the external case enables one to see clearly 

 which will produce males and which females;' both the 

 male and female pupae are figured by him, and exhibit three 

 remarkably prominent spiracles on each side. To acquire the 

 pupae, Knaggs recommends dragging the stream or pond 

 with a water-net, where Potamogeton grows, examining it on 

 the shore for the small silken cocoons. 



"The imago appears in June, July^, and August ; though 

 not continuously lor the whole period. During the three 

 months mentioned, the insect may be found in all its four 

 stages of egg, larva, pu])a, and imago; and it would seem* 

 that about ten months of the year (including the winter 

 months, as with Hydrocampa and Paraponyx) are passed in 

 the larval state, and about one month in the pupa. 



" The male imago is much more common, or more com- 



