PROC. ENT. SOC. WASH., VOL. 22, NO. 6, JUNE, 1920 125 



active than nymphs of the first form. Nymphs of the third form 

 have neither wings nor wing-pads and but slight traces of eyes. 



Description of Nymphs of the First Form of Species of Reticiditermes. 



Nymphs of the first form are quite unlike the winged adult, to 

 which they transform; this is not the case in nymphs of the sec- 

 ond and third forms. 



First form nymphs are white in color, 7 mm. in length (R. 

 flavipes), and have elongate wing-pads which extend backward as 

 far as the 5th abdominal segment. These pads are opaque at 

 maturity; they show traces of the adult wing venation. The 

 compound eyes have a reddish brown pigmentation. The an- 

 tenna consists of 17-18 segments. 



The body of this nymph, like most immature insects, has its 

 parts somewhat grosser in structure than the adult. 



Stylets or genital appendices are present in both sexes on the 

 ventral surface of the 9th abdominal segment. 



Description of Nymphs of the Second Form of Species of Reticiditermes. 



Except for the mature pigmentation, second form nymphs in 

 general resemble their adults. 



Second form nymphs are white in color and 7-7.5 mm. in length 

 (R. flavipes}. Instead of the long wing-pads of the nymphs of 

 the first form, nymphs of this form have but short wing-pads or 

 vestiges extending only to the 3rd abdominal segment. The an- 

 tenna has 17-18 segments (R: flavipes). When matured to 

 adults they attain slight pigmentation to the chitinized portions 

 of the body; they possess only partial pigment in the compound 

 eyes. Adult maturity is attained normally after the nymphs of 

 the primary form have developed to winged, pigmented adults. 

 Even as immature nymphs, second form nymphs are more active 

 than those of the first form, yet their body structure is grosser in 

 all parts. 



As adults of the second form, they are sexually mature, whereas 

 first form adults do not attain their maturity until after the swarm. 



Stylets or abdominal appendices are present in both sexes on 

 the ventral surface of the 9th abdominal segment. 



Description of Nymphs of the Third Form of Species of Reticiditermes. 



For many years the writer had noted that in certain colonies 

 of species of Reticiilitermes, where there were numerous eggs and 

 recently hatched young, it was impossible to find any enlarged 

 first, second or even third reproductive forms. Nevertheless, in 

 these colonies, nymphs worker-like in form, but with creamy 



