A Stndv (if Sonic Erü;\tni; viiir Aiits. 



;irt' (listino-iiisliable also, in tlie iiiaiu. hy tlie differences in tlie 

 sculptiiring-. 



IV. Obscrvalioiis on s(mK' Doryliiic and (*aiii]»OH<)tine Ants. 



hl tlie DorijJiiHic and (':iini)<>ni>iiiHir we slionld cxjiect to find 

 extremes in the devel(ii)nicnt ot' tlie ovaries of tlie (|neen and worker. 

 Tliis was tbnnd to be trne lo a teitain extent; in the former sub- 

 taiiiily specialization lias .u'one so far tliat tlie ovaries of tlie queen 

 are very larg-e "wliile those of tlie worker are very rndimentaiy 

 indeed, in the other specialization has not g'one so far and therefore 

 the ditferences between the ovaries of the queen and worker are 

 iiet SO yi'eat. 



Eciton scJintitti Emery. 



While a nest of Eciton schmitii was being excavated the head 

 of the (lueen was accidently ent oif and she was immediately brougiit 

 in to be stiidied as the queen of this species had never been dissected. 

 After being- brought to the laboratory this decapitated queen depo- 

 sited about fifty eggs before she eould be dissected, and indeed 

 whenever the needles touched the chitin of the abdomen eg'gs were 

 tlirown out in great numbers. The abdomen was very much distended 

 and the ovaries were in a very mature condition, and filled the 

 entire body cavity. From the vagina two long oviducts extended 

 the entire lengtli of the ovary. and into each oviduct innumerable 

 tubules, filled witli mature eggs, poured tlieir Contents. The drawing 

 of necessity had to be very diagrammatic 

 and fails to sliow anything like the true 

 nuniber of tubules. One hundred and 

 sixty-two were counted on half of one 

 side, so that the total iiumber of tubules 

 could not be far from five hundrt^d. The 

 tubules reached alniost to the vaüiiia alony- 

 the oviduct. On the vagina occun-ed the 

 receptaculum seminis of rather 

 large size, ap[>arently a necessary adap- 

 tation to the large number of eggs to be pj,, ^j 



fertilized. That many of tliese are mature Eriton srhinifti Emery. 

 at a time is indicated bv the faet that Ovarv nf the (jueeii .slmving tbe 

 l,alf of the tubules on eacl, sifc cu„- :^^:;Z:Sf''i;:lS 



tains several ripe eggs. The tubules 



tubules 



