1868-1 



393 



[Packard. 



The following eheiuical analysis proved it to be true guano: — 



Water 



Organic matter ...... 



Phosphate of lime (with a little phosphate of iron) 

 Carbonate of lime ...... 



Soda ........ 



Siliceous sand ...... 



Sejiarated by another analysis, there was found:- 



.5.00 



2.34 



60.00 



10.00 



2. GO 



20.00 



Phosphoric acid 

 Lime 



100.00 



32.29 



28.79 



This fossil guano is filled with casts of shells, which appear to be 

 Terebratuke and is probably of tertiary age, but as yet no description 

 of the geological character of the deposit has been received. 



Section of Entomology. February 26, 1868. 



Mr. B. P. Mann in the diair. Seven members present. 

 The Secretary read the following paper : — 



On the Structuke of the Ovipositor, and Homologous 

 P.\UTs IN THE Male Insect. By A. S. Packard, Jr. 



The rudiments of the ovipositor of Bomhuti fervidua appear before 

 the larva has a'tained its full size, as in specimens whose tegument 

 had been hardened by alco- 

 hol, the rudimental "rhab- O CD 

 dites" — as Lacaze-Duthiers 

 terms the elements of the 

 ovipositor — could be faintly 

 seen. When the larva is 

 about full-grown, the three 

 terminal segments (eight to 

 ten) appear, as represented 

 in Fig. 1. The broad, large 

 sternites are separated by a 

 well-marked suture from the 



Fig. 1. 



Fig. 2. 



pleurites. Just behind the middle of the eighth sternite, and at a little 

 distance from the mesial line, are situated a pair of flattened tubercles, 



