320 The Life History of Wirewonns 



a large iiiunbei' of fine corrugations along their edge. Tlie stigmatic scar 

 is linear, placed transversely close to the anterior margin of the spiracle. 



The ^th abdominal segment (Plate XIV, fig. 2) is flattened on the dorsal 

 surface and is bordered by a raised rim of chitin. It has a median longi- 

 tudinal furrow, from which three principal tributary furrows branch 

 obliquely forward, connecting with the lateral furrows. These extend in 

 a somewhat indefinite line midway between the lateral margins of the 

 disc and the central furrow. The remainder of the dorsal surface is punc- 

 tured and furrowed irregularly. At the side of the segment, on the mar- 

 ginal rim, there are lour large brownish tubercles, each bearing a long 

 seta from its side, and ventral to these, below the rim, are three or four 

 more similar but smaller tubercles. The shape of the disc is almost 

 circular. 



The space between the terminal processes is semicircular anteriorly, 

 but posteriorly it is almost closed by the two converging inner branches 

 of the processes, which are nearly cuneiform. The outer branch of each 

 process terminates in a strong brown, upwardly curved hook, which 

 itself bears a small accessory hook on its inner margin. 



On either side of the segment from the anterior margin of the disc, 

 a brownish raised line, resembling the transverse muscular impression 

 of the other abdominal segments, is continued ventrally to the marginal 

 border of striae which surrounds the sternite and pseudopod. 



Pupa. 



Length of male pupa in natural arched jDosition 10 mm., expanded 

 after fixation 13 mm.; breadth 3 mm. In general it resembles that of 

 Agriotes obscurns and bears spines at the anterior and posterior angles of 

 the pronotum as well as at the posterior end of the 9th abdominal seg- 

 ment. An additional pair is however borne by this species (and some 

 other Elaterid pupae), one on either side of the median suture at the base 

 of the pronotum. These project outwards and somewhat forwards and 

 are shorter than those at the posterior angles. Prothorax both actually 

 and relatively longer than that of A. obscurus, with its sides more parallel. 

 Metathorax is also longer, bearing a somewhat wide longitudinal suture 

 in its median line, which does not reach either to the anterior or posterior 

 margin of the segment. Antennae reach just beyond the intermediate 

 femora. A little below the apex of each antennal segment from the 3rd 

 to the last there is a whorl of small tubercles. Maxillary palps rather 

 long and incurved. Apices of elyiral cases tapering to a fine point and 

 bearing at the apex a short reflexed brownish hook. 



