76 Journal New York Entomological Society. [Vol. xxviii. 



or 1 6 forms, but they all belong to the Scolytidse, which is a very 

 exceptional and limited division of the Rhyncophora (Zeitschr. wiss. 

 Ins. biol., 7, 191 1, p. 306, etc.). 



Our means of forming a conclusion on the point I am alluding 

 to are therefore very limited, and the question will have to be an- 

 swered by concomitant considerations of the males and females of 

 particular species. The female structures are more difficult of inves- 

 tigation than the male, and I have paid comparatively little attention 

 to them, still I have formed the opinion that there exists a correlation 

 of the kind I have suggested and that Conotrachelus offers an exem- 

 plification of it. 



Figure i gives a representation of the female structure of the 

 species, where ut. is the bursa, spt. the spermatheca and ovd. the 

 common oviduct; as regards the parts near the anal aperture the 

 figure is diagrammatic, but the other parts are fairly exact. 



The sperm has to be lodged in the spermatheca, which is con- 

 nected with a long, slender duct to the bursa at the spot where it 

 joins the oviduct. The sac in the male, fig. 5, is., enters the bursa, 

 and brings the functional orifice of the transfer apparatus to the 

 mouth of the duct of the spermatheca; there is thus formed a con- 

 tinuous canal extending from the testes of the male to the sperma- 

 theca of the female. 



Of course, one swallow does not make a summer, and one case in 

 which we can imagine a correlation does not show that such a corre- 

 lation is general, but I may mention that in the Celenthetides, where 

 the male sac is extraordinarily long and slender (see Trans. Ent. Soc. 

 London, 1918, pi. IX, f. 7), there is a corresponding elongation of 

 the female passages. It must not be forgotten that these mem- 

 branous parts are extremely elastic in both the female and the male 

 and that it is very difficult to restore them to their natural functional 

 shapes. 



But if it be granted that there is a correlation between male and 

 female structures this only increases our difficulty in understanding 

 their variety and complication. 



In the primitive condition, exemplified in Archotennopsis of the 

 Termitidae the female possesses a short oviduct, with a sperrriatheca 

 having a very short duct, and colleterial glands having a separate 

 orifice on the ninth sternite, while the male has no copulatory appa- 



