126 PROC. ENT. SOC. WASH., VOL. 22, NO. 6, JUNE, IQ2O 



white abdomen, often occurred. It was then suspected that 

 these might be young reproductive forms of the third type. 



Careful histological study has proved this to be the case, (Thomp- 

 son and Snyder, 1920). 



In general, third form nymphs resemble the adults except they 

 lack the mature pigmentation. 



Third form nymphs are creamy white in color, 5-6 mm. in 

 length (R. flampes); these nymphs are entirely apterous and 

 possess neither wings nor wing-pads and but slight traces of the 

 compound eyes; the antenna has 16-17 segments (R. flampes). 

 Hence they are worker-like or "ergatoid." When mature, they 

 attain a partial very slight pigmentation. 



Stylets or abdominal appendices are present in both sexes on 

 the ventral surface of the 9th abdominal segment. 



Description of Nymphs of the Reproductive Forms of Other Genera of Termite's. 



In species of Termopsis nymphs of both the first and second 



forms have relatively shorter wing-pads than in species of Reticu- 



litermes. There are numerous forms with rudimentary wing-pads 



intergrading intermediates between the nymphs of the second 



and third forms. These intermediate nymphs and nymphs of 



the third form are common. Nymphs of the second form are 



apparently not common in colonies; this is also true of second 



form adults. 



Prorhinotermes simplex Hagen, an Antillean termite, which oc- 

 curs in southern Florida, has second form nymphs with peculiar 

 curved and fused wing-pads (expanded thoracic plates). These 

 nymphs and nymphs of the third form are common. Nymphs of 

 the first form of this termite have not been found in Florida, but 

 occur in Jamaica. 



Development of the Nymphs of the Reproductive Forms. 



In eastern United States nymphs of the first, second and third 

 reproductive forms of species of Reticulitennes may attain their 

 full mature length in the autumn. During late October and 

 November, 1918, first form nymphs were found in colonies at Falls 

 Church, Va., on which the wing-pads were of full length and 

 with a light-pinkish pigmentation in the eyes, as Dobson (1918) 

 has found to be the case in the vicinity of Boston, Mass. How- 

 ever, full maturity of the nymphs of the first form, with the 

 attainment of opaqueness of the wing-pads and fuller pigment 

 to the eyes, is not until spring (the last of March or first of April) 

 in Virginia. The nymphs of the second form become mature 

 shortly afterwards before the swarm. It is not known definitely 

 when the third form nymphs become mature. Nymphs appar- 

 ently mature have been collected in the late summer and fall in 



