A. W. Rymer Roberts 215 



Again, in the abdomen of the adult beetle there are normally visible 

 seven tergites dorsally and but five sternites ventrally, the first two 

 sternites being suppressed beneath the third. Within the 7th segment 

 the 8th is concealed for the greater part of its length. In the female the 

 ovipositor arises from this segment and in the male there are evidences 

 of two rudimentary segments beyond it, as Verhoeff found (15), making 

 ten in all. Stein (14) made out nine abdominal segments in the female, 

 considering the ovipositor to be formed of the 9th tergite and 8th and 

 9th sternites. The eighth, however, is the last segment bearing a pair of 

 spiracles in both sexes, so that the remaining two segments, if true 

 segments, must constitute parts of the ovipositor. The "Vaginal palpe," 

 or tactile process on either side of the aperture of the oviduct, is the 

 terminal one according to Stein. 



Therefore though there is considerable similarity between the form 

 of the first seven abdominal segments in the pupa and the adult, the 

 segments posterior to the 7th are entirely different, continuing to taper 

 gently to the apex of the 9th in the pupa, while in the adult they are 

 much narrowed and normally contracted within the body of the beetle. 



REFERENCES. 



(1) Adrianov, a. p. (1914). Repi. on tvorlc of EntomoJ. Burenu {of Kahiga) 1913- 



1914. 



(2) Beling, Th. (1883). Deutsch. ent. Zeits. xxvii, 138. 



(3) BoviNG, A. G. (1910). Intern. Revue ges. Hydrohiol. u. Hydrogr. {Supplement). 



(4) Curtis, J. (1860). Farm Insects, pp. 152-18|u 



(5) Ford, G. H. (1917). Ann. App. Biol, iii, 97. 



(G) Gahan, C. J. (1893). Ann. and Mag. Nat. Hist. ser. 6, xi, 154-156. 



(7) Henriksen, K. L. (1911). Entom. Meddel. iv, 225-331. 



(8) Kemner, a. (1913). Arkiv.for Zoologi, viii. No. 13, 15, Plate 1, fig. 3. 



(9) de Meijere, J. C. H. (1895). Tijdschr. Entom. xxxviii. 05-100. 



(10) IVIiALL, L. C. and Denny, A. (1886). The Cockroach. London. 150 and 155, 



Fig. 88. 



(11) Roberts, A. W. R. (1919). Ann. App. Biol, vi, 116-135. 



(12) ScHiODTE, J. C. (1870). Naturh. Tidsskr. ser. 3, vi, Pt. 3, 467-536. 



(13) Scott, H. (1920). Trans. Ent. Soc. p. 99. 



(14) Stein, F. (1847). Anatomic u. Physiologic der Insecfen, Taf. V, fig. 6. Beilin. 



(15) Verhoeff, C. (1894). ZooL Anz. xvn, 100-106. 



(16) Xambeu, — (1912). Ann. Soc. Linn, de Lyon, Lix; (1913) Ihid. lx. 



EXPLANATION OF PLATE IV 



Agriotes obscurus, L. larva in late stage. 



a. Last three segments. 



b. Cuticle of 9th abdommal segment, between the sensory pits (much enlarged). 



c. Cuticle of 8th abdominal segment along the medio-dorsal suture (much enlarged). 



d. Spiracle. 



(Received July lUh, 1921.) 



Ann. Biol, viii 15 



