THE HIDDEN TYPE OF WING-GROWTH 105 



the body-segments which extend outwards so that the legs, 

 though well developed, are hardly visible from above. Such a 

 larva shows a striking likeness to a wood-louse (Oniscid] and is 

 therefore known as an onisciform larva ; like those already 

 described it has a firm, hard cuticle. A character in which it 

 resembles an adult beetle more closely than any of those larvae 

 is found in its long, many- jointed feelers. The jaws of the 

 Helodes larva are on the whole like those of the Dascillus grub 



FIG. 57- 



Hypopharynx and Maxillulae (Mxl) of (A) Dascillus ( X 45), and (B; Helodes ( x 90). A.. II, lateral 

 lobes, and It, lateral sclerites of hypopharynx ; tt lt its median teeth ; pe, foot of hypopharynx. 

 B, /,, i a , rows of maxillular teeth ; c, condyle. After Carpenter and MacDowell, Quart. Journ. 

 Micr. Set. LVII. 



only much more delicate, and sharing in the general flattening 

 of the body. The maxilla has cardo, stipes, lacinia, galea and 

 three-segmented palp ; there is here some tendency to fusion 

 between these parts, the lacinia and galea being partly en- 

 veloped in a common cuticle. The maxillulae of the Helodes 

 larva are very perfectly developed. Each maxillula (Fig. 57 B) 

 consists of a rounded lobe whose outer basal region articulates 

 with a boss on the upper aspect of the broad tongue. Its 

 surface is covered with numerous parallel rows of minute teeth 



