54 MAINE AGRICULTURAL EXPERIMENT STATION. 1917. 



ments ; dorsum of fifth abdominal segment with a deep furrow 

 along the cephalic margin, invisible when the body is contracted 

 and the movable segments telescoped; abdominal spiracles 

 slightly produced, the openings elliptical ; dorsal furrows present 

 between the ninth and tenth abdominal segments, its caudal mar- 

 gin finely serrate, the lateral extension reaching caudad almost 

 to the base of the cremaster; cremaster about twice the length 

 of the tenth segment, a slight furrow at base, bifurcate at tip 

 and with hooked setae near the proximal end. 



HYDRIA UNDULATA Linnaeus. 

 The Scallop-shell Moth. Fig. 4, A and D. 



Color reddish brown; ventral surface of head and append- 

 ages with shallow, impressed lines, labrum slightly elevated ; 

 thoracic segments with irregular, deeply impressed lines ; met- 

 athorax and first abdominal segment showing a rather promi 

 nent ridge along the caudal margin ; abdomen with the first 

 four segments coarsely punctate except a narrow strip along the 

 caudal margin; dorsum of fifth segment almost smooth caudad 

 of the furrow which is edged with black ; sixth, seventh and 

 eighth segments like the first four, the ninth and tenth practi- 

 cally smooth ; cremaster rugose at base, narrowing rapidly to 

 a slender spine-like part which is bifurcate at tip, the arms of the 

 bifurcation slender and divergent, lateral margin of cremaster 

 with three slender hooked setae along each lateral margin. 



Average length 9 mm. ; greatest width 3 mm. 



The larvae of the scallop-shell moth feed mostly on cherry. 

 They are dark brown or nearly black on the back with some 

 fine yellow lines, and yellowish white underneath. They make 

 a sort of nest by webbing the leaves together at the end of a 

 branch and adding more leaves as they need food. The larvae 

 were collected August 26 and soon after entered the soil to pu- 

 pate. They form an earthen cell in which the pupa passes the 

 winter. 



Genus PALEACRITA Riley. 



Body of usual type, but usually strongly convex on the 

 dorsum of the first three abdominal segments, so that the body 



