306 Habits of the GreenJiotfse White Fhj 



because of the contrast. Each eye is completely divided into two parts, 

 each of which appears to consist of a single ommatidium. The larva 

 is 0-29 mm. long, transparent, with a pair of dark yellow masses (present 

 in all stages) in the abdomen, generally in the three or four anterior 

 segments, but sometimes extending into the thorax. This pair of 

 yellow masses is the mycetoma, or pseudovitellus. The segmentation 

 of the abdomen is not distinct until a few minutes after emergence, 

 when the chitin has hardened. There are six abdominal segments, but 

 no differentiation in the thorax. The body margin has a series of spines 

 (Fig. 6), fifteen pairs of which would seem to be segmentally arranged, 

 since they are so arranged in the abdomen. Between the posterior 

 two pairs is a pair of much longer spines ; and posterior to all of these 

 are the very long cerci (Fig. 7). 



Fig. 7. Lateral view of hind end. 



This larva is active for about three days, during which time it wanders 

 about the under-surface of the leaf. It thus differs from some other 

 species in which the larva simply gets clear of the egg before settling. 

 Previous to settling down, or at about this time, the spaces between 

 the marginal spines become filled in with wax formed by marginal 

 wax glands. 



The larva prefers a position alongside one of the leaf veins, and 

 since the site it occupies is retained by the later instars, which are 

 sedentary, the choice of this first larva is important. The waxy fringe 

 is much wider in this stage than in the succeeding 02ies, and it gradually 

 narrows in the succession. Behind the sixth abdominal segment, 

 dorsally, is the vasiform orifice, the consideration of which I leave till 

 later. Legs and antennae are functional during active life, and are 

 well developed com])ared with those of the three later stages. 



Mouth jHirls. Tlicte is a veiv short lostrum situated between the 

 anterior legs. Two pairs of stylets coiTcspond to tlie maxillae aiul 



