A. W. Rymer Roberts 31 7 



Ovum. 



An outline figure of an egg was given in Pt, 1 (p. 133, Fig. 5). The 

 shape is very variable, though always rounded. It may be nearly 

 spherical (-47 x -42), bean-shaped in pi-ofile, or broadl}^ ovoid. Average 

 dimensions of four eggs -51 x -41 mm., the largest -56 x -43 mm. The 

 shell is transparent, showing the milky-white contents within. Its surface 

 when fresh is clearly granular as seen under a low power of the microscope, 

 the granules being distributed thickly and evenly over the entire surface. 



Thirty ova, most of them in a cluster, were found at |-J inch below 

 the surface of the soil on 12th July 1918. Many of them were observed 

 to be advanced in development of the embryo and most hatched on 

 21-22 July, so that they must have been laid at the beginning of July 

 at the latest. 



Larva in First Instar. 



Length at hatching from 1-5 mm. to 2-0 mm. Opaque white, head 

 yellow and with some sign of yellow in the thoracic and 9th abdominal 

 segments. 



Head quadrilateral, a little broader than long. Mandibles stout, 

 sharply pointed and brown at the apex, vnth. a large, yellow, strongly- 

 recurved retinaculum below the apex on the inner side. Nasale or 

 clypeal process distinctly tridented; teeth sharply pointed. Profhorax 

 as long as the two following segments taken together. On the dor.sal 

 surface it bears 4 setae, the posterior pair scarcely, if at all, longer than 

 the anterior pair. The other segments of the thorax have only one pair 

 of setae, at the posterior end. In the ahdoininal segments there is a trans- 

 verse row of 4 long setae posteriorly, which are longer than the segments 

 to which they belong. The length of the abdominal segments gradually 

 increases from the 1st to the 8th. 



The ^th ahdominal segment is broadest anteriorly and tapers to the 

 posterior end, where it is narrowest. The space is nearly oval and is 

 almost completely closed behind by the inner branches of the processes. 

 This inner branch is tapered to a simple point and is not cuneiform, as in 

 the older larva. The outer branch is yellowish and upturned but blunt 

 at its apex. The two processes are yellowish. The posterior pair of mar- 

 ginal tubercles are alone visible at first, other two becoming visible later 

 in the instar. The flattened disc of the dorsal surface is obvious even in 

 newly-hatched larvae and the sagittal median furrow, with the trans- 

 verse furrows, are visible in a suitable light beneath even a low magni- 

 fication. The pseudopod, or anal papilla, is rather large. 



