83 



Forty of the small and the same number of large lobes of the sali- 

 vary glands of Prislhesancus papiiensis were put into separate 

 test-tubes and emulsified with a glass rod, two drops of distilled 

 water being added. The two emulsions were then tested with blue 

 litmus, which is each case was immediately and distinctly reddened, 

 showing that the saliva of this Reduviid is probably acid. Like 

 results were obtained with glands of the Reduviid ^phedanolestes 

 nipjidicus mentioned above. A smaller quantity of the glands of 

 Enectus elongatus (which was not to be obtained in any numbers) 

 gave no results with litmus, which may be owing to the weakness 

 of the emulsion, or the saliva may perhaps be neutral, especially 

 as quite a small number of glands of the Reduviids was found 

 sufficient to redden litmus. 



LETTERING OF FIGURES. 



Fig. 1. a = exterior view of syringe in early embryo. 



b = longitudinal section through syringe of later embryo, showing end 



invaginated. 

 c = longitudinal section through syringe of early embryo; m = retrac- 

 tor muscles of plunger ; sd =: salivary duct ; jsd = junction of the 

 two ducts. 



Fig. 2. Upper fîg. : Longitudinal vertical section of syringe of adult Pm/Ae- 

 sanctis papuensis ; pb = plunger barrel; p = plunger; pr = plunger 

 rod; m = retractor muscles; sd = salivary ductf; jsd = junction 

 of the two ducts; V = valve; ps = syringe stem; r = rib. bl = base 

 of labium; t = valve; st = strut. To the left a transverse section of 

 syringe stem about the Une a — b. 

 Lower fig. : — Posterior part, longitudinal horizontal section of 

 syringe, lower part of plunger eut away to show opening of ducts; 

 anterior part, view looking on exterior. Same lettering as before, 

 but osd = opening of salivary ducts. 



Fig. 2a. Posterior part of same, but showing the plunger retracted and the valve 

 opened. Upper fîg. same, reduced ; view looking on exterior. 



Fig. 3. Salivary glands of adult Pristhesancus papuensis ; hc = head capsule; 

 s r= syringe; sd = salivary ducts; rd = réservoir ducts; sg = sali- 

 vary glands; sr = salivary réservoir; at = accessory tubes of réser- 

 voirs; n =: nervecords; sdj. = junction of salivary ducts. 

 d showing réservoir duct (rd) caught up by muscles (m) and tra- 



cheae (tr). 

 e longitudinal section of salivary duct highly magnified, showing 

 nuclei and striae. 



Fig, 4. Salivary glands of Enectwi elongatus. Same lettering as before. 



Note. — Ail the figures are much enlarged. 



