B24 



MAUD D. HAVILAND 



chorion is smooth, hut the rest of the surface is covered with 

 minute scales or papillae. Dimensions, -31 x-lOmm. (Text- 

 fig. 2). This egg is very similar to that of Pachyneuron 

 gifuensis, Ashm., figured hy Howard and Fiske (7). 



The First Instar. 



Dimensions -45 mm. x-23 mm. 



The egg hatches ahout sixty hours after oviposition. The 

 larva in the first instar much resembles in general form that 

 of the Lygocerus previously described (Text-fig. 3). It is 



Text-fig. li. 



Text-fio. 4. 



The lan-a of the first instar. x.*iOO. 



Mandibles of the 

 newlv-hatched 

 lan-a. x60(». 



white, semi-transparent, and consists of thirteen segments in 

 addition to the head, which is furnished with two tactile papillae. 

 The mouth is small and oval, and the mandibles are somewhat 

 more curved than those of the larva of Lygocerus (Text- 

 fig. 4). . 



The tracheal system consists of a pair of longitudinal trunks, 

 united by an anterior commissure between the first and 

 second segments, and a posterior commissure in the eleventh 

 segment. At this stage there are four pairs of functional 

 spiracles, namely between the first and second segments, and 

 on segments 4-6 inclusive. These segments are supplied 

 with dorsal and ventral lateral branches, and the developing 

 spiracular trunks of segments 3 and 7-9 are visible. The 

 larva makes an incision in the skin of the host, and as the 



