NOTICS ON IlYCIlILi SMKRINTHUS POPULT-OCELLATUS. 189 



arc short and square. Tlie inferior harpes are bifurcate at tiie ex- 

 tremity, with two e(]ual projections. The uncus is broad and rounded, 

 sli^'htly indented at tlie tip. The penis is unv^ and slender, widening ' 

 at tlie base into two lobes, surmounted by two short spines (PI. iii., tig. 1). 



" It will be noticed tliat in no jjointdoes the hybrid agree with this 

 latter species. But we tind the male hybrid, t(j a certain extent, agi'cc- 

 iug with S. ocellatus in the uncus, the hook on the lip of the i)enis, and 

 in the rounded portion of the apparatus at the base. The liaj) rather 

 a[)proaches (!•/(/<', PI. iii.) to that of N. iiopuli, the lower portion of the penis 

 being tlivided between the two parent species, and partaking of the 

 characters of l)oth. 



" It will thus be seen that the a|<i)arently male specimen possesses 

 distinctly nuile organs, all of which are highly develo[)ed, and dili'ering 

 from those of the parents. 



" Genitalia of female 8. popull — The organs consist of two 

 lobes covered with tubercles, each of which emits a short, stilt" hair, 

 and have somewhat the appearance of a spider's spinneret ; there is 

 also the ovipositor, which consists of a short tube ; this is placed about 

 thi'ee parts of the way down the final segment (PI. iii., fig. <>). 



" Genitalia of female S. ocellatus. — The female of this species 

 has so nearly similar organs to those of the last, that further description 

 is unnecessary (PI. iii., fig. 5). 



" Genitalia of apparent fe.male hybrid 8. ocellatus-populi. — 

 Tliis proves very interesting, for besides having the lolies, similar to 

 those in female S. popull and N. ocellatH.'^, there are, mixed up within them 

 in the last segment, the rudimentary and partially developed organs of the 

 male, the whole ap})aratus is much smaller than that of the jjareiits. 

 The lobes are similar to those of the female parents. Immediately 

 behind are some cmious structures, which are apparently the rudimen- 

 tary inferior harpes, then there is one su^jerior harpe, well defined, but 

 very small ; neither the uncus nor the anal fla}) is separable, but no 

 doubt both are present in some rudimentary form ; the i)enis is very 

 distinct ; it is rounded at the base, and consists of a short tube sui-- 

 mounted l)y a large number of very small spines. Farther back, near 

 the junction of the })enultimate segment, is the ovipositor (?), scarcely 

 smaller than that of the parents (PI. iii., fig. 7). Ova were al.so discovered 

 in the l)ody. It is (piitc clear that this specimen is gynaudromorphous. 

 Whether all the apparent female hybrids are similarly constructed, further 

 material alone will show. I should certainly say that this specinieu 

 was incapable of rei)roductiou. The hybrid males, in my opinion, 

 might cross again with either female parent — N. ociilatua or S. p()})idi — 

 when, presumably, the progeny would revert in ai)pearance to the 

 species of the female parent with which the hybrid male might be 

 crossed. The genitalia of the second male hyln-id (which was taken 

 from the pujja, and which had failed to emerge) i)resent no ditfei-- 

 ence from the organs of the first si)ecimen examined (in litt., 

 November 4th, 18U(i)." 



These results are of great interest, but, as Mr. i*ierce points out, the 

 examination of further material is necessary Itefore we can generali.se 

 with safety as to these characters being constant, and I trust that one 

 result of my ])aper will l)e that ere long further material may ])e sup- 

 jilied to ^Ir. I'ierce, so that a more definite conclusion on this point 

 can be arrived at. 



