3 82 



CAROLINE BURLING THOMPSON. 



sected out from the egg shell, in other cases they are slightly 

 older; (3) an early stage of development, usually 0.2-0.4 mm. 

 longer than the newly hatched nymphs, in which the external 

 appearance, and especially the size of the heads, is similar in all 

 nymphs; (4) a slightly older stage, varying considerably in length 

 in the different genera, in which an external differentiation may 

 be noted in the size of the heads, dividing the developing nymphs 

 into "small headed" (reproductive) forms, and "large headed" 

 (sterile) forms. 



PROTERMITID.E. 



Calotermes n. sp. Banks. The eggs of the most primitive 

 termites, those belonging to the family Protermitidse, are the 

 largest of the order Isoptera. 



a 



d 



00 



h 



FIG. i. Termite eggs, a, Termopsis angusticollis; b, Calotermes n. sp.; c. 

 Cry plolermes cavifrons; d, Arrhinotermes simplex; e, Reliculitermes flavipes; f, Anop- 

 lotermes fumosus; g, Amiterrnes tubiformans; h, Rutermes pilifrons. Spencer Oc. 6, 

 obj. 32, reduced one third. 



The eggs of Calotermes n. sp. (Fig. I, b} are long, slender, and 

 reniform, and are slightly larger at one end, the future head end; 

 they measure, in preserved specimens, from 1.2-1.4 mm. in 

 length. In all the species of termites here described the egg 

 length varies several tenths of a millimeter. It would be inter- 

 esting to know whether these variations in length are constant in 

 the living eggs, and whether they represent two different sizes 



