Sept., 1902.] 



The Larva of Molanna Cinerea. 



151 



transparent spot at its center. This pair of legs is more hairy than 

 he others. 



The abdomen of the larva is of a light color tinged with brick red. 

 The first segment has three tubercles (Fig. i), the upper one by far 

 the largest. Respiratory filaments occur on six of the nine segments. 

 They are placed at the forward edge of the segments, in two rows on 

 both dorsal and ventral sides. Their number and position may be 

 represented diagrammatically by the accompanying figures. 



Dorsal side. Ventral side. 



A fringe of hairs runs along the sides of the body from the third to 

 eighth segment. Along the latter segment, the fringe consists of very 

 stiff hairs set in pairs. The body is terminated by a pair of two- 

 jointed prolegs. These carry strong hooks which point outward. At 

 the base of each of the large hooks are two smaller ones. 



Internal Anatomy. 



The larva was found to be ([uite unfavorable for gross dissection, 

 hence for the study of internal structure reliance has been placed 

 chiefly upon microtome sections which were prepared by the ordinary 

 methods. 



The alimentary canal consists, as is usual, of mouth, gullet, crop, 

 stomach, intestine and rectum. The second of these divisions is 

 about straight ; its walls are not convoluted and are surrounded by 

 strong circular muscles This division extends to the prothorax. 

 The crop extends through the remainder of the thorax. Its strong 

 walls are much convoluted, and its circular muscles are of great size, 

 especially near the opening into the stomach. The region from 



