22 PROCEEDINGS OF THE NATIONAL MUSEUM. vol, 64. 



cylindrical and slightly curved. However, it does not seem possible 

 to find any definite character by which the second instars of the 

 different genera of N emognathinae can be separated. 



THIRD LARVAL INSTAR. 



Figs. 28, 29. 



Length of larva immediately after second moult, about 3 mm.; 

 before third moult, about 5.5 mm. to 6 mm. Width after second 

 moult, about 1 mm. ; before third moult, about 2 mm. 



Color, whitish. 



Setae, very few and short on head parts and legs; body set with 

 dense, minute asperities. 



Body, veiy similar to that of second instar, soft, thick, straight, 

 subovate, a little more fusiform than in the mature second instar, 

 but like this instar dorsally flat, ventrally convex and built for float- 

 ing on the surface of the honey-paste which gradually becomes 

 harder and more solid. 



Head, seminutant; at first large in comparison with rest of body, 

 that is, as wide and twice as long as prothorax ; later on in fully fed 

 larvae only of moderate size, the body having grown immensely, the 

 head but slightly, and in this last period of the third stage the width 

 of head in comparison with the width of prothorax is as one is to 

 one and one-half, and the lengths of the two structures are about 

 equal. 



Head capsule, slightly chitinized; nasale not fully as large as in 

 the second instar; ventral side of head capsule transverse and shaped 

 like a dumb-bell ; gula short with posteriorly converging sides. 



Ocellus, represented only by a small round point of dark pigment. 



Antenna, more cylindrical than in second instar. 



Mandible, broad, triangular, with chitinous, finely denticulate tip 

 and with chitinized ventral condyle ; tip of mandible reaching some- 

 what beyond the nasal margin. 



Maxilla, retracted, well developed, very slightly chitinized, the 

 different maxillary parts a little more slender, more distinct and 

 more individually movable than in the second instar. 



Labium, free. 



Thorax, occupying about one- fourth or less, of body. 



Legs, three pairs, of same shape as in second instar but compara- 

 tively smaller in proportion to rest of body, not well fitted for 

 locomotion. 



Abdominal segments, 10 ; the four anterior ones widest. 



Spiracles, dorsal, annular, very large, all of same size, the eighth 

 abdominal pair apparently not developed. 



