2l6 



NEW YORK STATE MUSEUM 



All Stages are found together on the piers. The eggs are laid 

 in the soft spots in the old wood, where the surface of the pier 

 is kept wet, but not continually covered by water, in the zone of 

 the " skin algae." The larvae live exposed or thinly algae covered, 

 and crawl about slowly over the wet surface. They are greenish 

 in color and very inconspicuous. In a cavity among the stems of 

 the dwarf mosses^ in a crevice at the upper limit of the wet area 

 the larva spins about itself a sheet of tissue and fastens bits of 

 moss stems and leaves to its outside, [fig. 9] and transforms inside 

 the tube thus formed into a pupa. The tube is longer than its body, 

 and the pupa moves in or out at will, doubtless by the aid of the 

 hooks at the ends of its body. 



The larva measures in total length 10 to 15 mm, according 

 to the state of extension of its body, and its diameter is, cor- 

 respondingly 1.5 to 2 mm. It is 

 cylindric, abruptly tapering pos- 

 teriorly on the last abdominal 

 segment. The head is wholly 

 retracted within the swollen pro- 

 thorax: extracted therefrom, the 

 head shows a broad middle pale 

 yellow band, and its sides are 

 black from the base of the an- 

 tennae backward. The labrum 

 is transversely oval, with a mar- 

 gin of close set scurfy hairs. The 

 clypeus is one fourth broader 

 than the labrum, yellow with 

 parallel sides, but emarginate on 

 the front for the reception of the 

 labrum, there are three recurved 

 stout setae on the lateral margins 

 of the clypeus each side, and one 

 on each angle and two upon its 

 disk. 



There are no legs, but there is 

 a scurfy pubescent creeping fold 

 on the under surface of the meso- 

 and metathorax and a similar 

 one on the first abdominal segment: and there are much larger, 

 transversely placed, muscular, scurfy-skinned creeping ridges on 

 the under surface of abdominal segments 2-7 toward the front of 



'These mosses were kindly named for me by Professor Barnes of Chicago 

 University, as Bryum binum Schoeb. var. varium Lindb. and A m- 

 blystegium orthocladon Lesq. and James. 



Fig. 



