154 



Journal New York Entomological Society. 



[Vol. X.- 



and in the upper angle formed by another dorso-ventral muscle with 

 the body wall. They lie near the anterior end of the segments named, 

 a little above the middle of the body so that the lateral fringe crosses 

 the glands below the center. The fact that they appear of the same 

 shape in both frontal and sagittal sections would indicate that the 

 glands are round. Their diameter was estimated at one half the length 

 of a segment, and their depth about one eighth or one ninth the width 



Pig. 2. Ventral section of a dermal gland ; a, dorso-ventral muscle; />, epithe- 

 lium ; r, mouth of the gland ; (/, lateral frmge. Drawing by Miss Maud H. Anthony. 



of a segment. The gland cells are wedge-shaped and are evidently 

 modifications of the regular epithelium. Their nuclei are granulated 

 and have small clefts pointing to the mouth of the gland. They lie 

 along the inner edges of the cells. Numerous vacuoles occur through- 

 out the gland. Concerning the function of these glands nothing was 

 learned. Their absence in the pupal stage might lead us to infer that 

 perhaps they were concerned in the process of metamorphosis, as is 

 known to be true of the dermal Ldands of certain other insects. 



