154 



DR. A. D. IMMS ON THE 



4. The Laeva. 



A. The young Larva. — The young larva when first hatched is white, with brownish 

 mandibles, and the eyes appear as a purplish- black sj)ot on either side of the head 

 (PL 32. fig. 2). In thirteen examples the length varied from r40-l - 77 mm., the average 

 length being 1*5 mm. The breadth across the widest part of the body varied from 

 •35-"42 mm. For the purposes of description, it will be convenient to divide the larva 

 into three regions, viz. : the head, the neck and the trunk. The head is very slightly 

 broader than long, the widest part being the region between the eyes ; posteriorly it 

 narrows very considerably. The antero-lateral angles are rounded, and the anterior 

 border of the head is excavated into a moderately deep sinus ; the posterior border is 

 curved to form a relatively shallow sinus. The eyes are situated on a rounded pro- 

 tuberance bulging out on each side of the head, and placed just external to the point of 

 insertion of the antenna of its side. They consist of a group of six or seven pigmented 

 ocelli on each side. The antennae are somewhat longer than the head, measuring 

 •40-"42 mm. long. They are ten-jointed ; the basal joint is shallow and annular, and the 

 second joint stout and wide, the two joints together forming a scape. The fiagellum, or 

 remainder of the antenna, consists of elongate basal and terminal joints, both subequal 

 in length, and measuring - 11-'13 mm. long. Between these two joints is an intervening 

 region composed of six small joints of about equal size. The apical joint of the antenna 

 is terminated by setae possibly of a sensory nature. The mandibles are rather longer 

 than the head; they are curved and acuminate, and each is provided with a row of four 

 teeth along the inside margin of its proximal half. The first tooth is very small (in 

 some specimens it is wanting altogether), the second large, and the two distal teeth are 

 largest of all. The maxillse (PL 32. fig. 4) arc highly modified and closely resemble the 

 mandibles in form. In length they equal the mandibles, but they are narrower and are 

 not provided with teeth. They lie immediately ventral to the mandibles and are closely 

 applied to a groove on the under surface of the latter. They are not visible from above, 



