172 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



ends. The pharyngeal sclerites or lateral plates are not heavily chitinized, 

 light brown in color and fading out in certain areas to a rather translucent 

 membrane. Longitudinal folds evident in the ventral wall. (Plate 1, 

 figs. 2 and 3.) 



Anterior spiracles 10 lobed. Twelve visible body segments. Lateral 

 fusiform areas from the 6th to the 12th segments, rather faint and not 

 spiniferous. Ventral fusiform areas present from the 5th to the 12th seg- 

 ments. These pads bear rows of minute close set spinules (Plate 1, fig. 4), 

 and the arrangement of these rows varies slightly from pad to pad. On 

 the ventral side of the terminal segment, in addition to the spiniferous 

 pad, is seen the diamond shaped anal area, around the margin of which is 

 a fringe of close set spinules. No spinules on any part of the body except 

 the ventral fusiform areas and the margin of the anal field. All spinules 

 concolorous with the body. Caudal end of the body somewhat truncated. 

 No marginal tubercles about stigmal field. Stigmata are elevated on dis- 

 tinct stalks which project backwards and slightly upwards and diverge a 

 little from each other. The stigmata (Plate L, Fig. 5) are about 0.07 mm. 

 in diameter and about 0.13 mm. apart. Three spiracles in each stigmal 

 plate, oval in shape and radiately arranged. A button appears as a small 

 clear spot on the upper inner side of the stigmal plate. 



The accompanying figures (Plate XII, figs. 2 and 3) of the 

 cephalopharyngeal skeleton differ in some details from the figure 

 given by Mr. Banks. 1 His figure represents the appearance of 

 this structure when viewed through the body wall without dis- 

 section, and was probably drawn from a specimen mounted in 

 balsam and sent in from California by Mr. Coquillett. When 

 the anterior end of the body is cut off and treated with potash, 

 and the body wall dissected away, there are certain details, espe- 

 cially the more transparent parts of the pharyngeal skeleton, 

 which are not otherwise visible. 



A study of the larval food of this species reveals no highly 

 specialized habit. In Doctor Howard's paper on the insect 

 fauna of human excrement (p. 585) the rearing of the species from 

 human feces is recorded as well from onions, cotton balls, osage, 

 orange fruit and apples previously injured by the codling moth 

 and it was suggested that in all cases the insect appeared to fol- 

 low the work of other species. The only other published note 

 on the larval food we have found is one by Drs. Riley and Howard 

 in Insect Life, Vol. VI, p. 270, in which they list the following 

 rearings in addition to those just mentioned; sumach fruit from 

 Virignia, bolls of Solanum carolinense from the District of Colum- 

 bia. The following additional records are to be found in the 



1 Banks, N., U. S. Dept. Agric. Bur. of Ent., Tech. Series 22, Plate VII, 

 Fig. 121. 



