12 



ARKIV FÖR ZOOLOGI. BAND 3. NIO 18. 



The deutonympha (Fig. 27 Pl. I) resembles perfectly the 

 tritonympha except for the smaller size and the absence of geni- 

 talia and distinct shields. 



Tritonympha 7nasciilina generans. (Fig. 14 Pl. I.) 



Colour, very light straw-yellow. The textur e is on the dor- 

 sal side exceedingly finely punctured, on the ventral shields 

 finely punctured and scaly.^ The form of the body is nearly 

 circular, the sides onty anteriorly slightly falling off . 



The dorsal side is protected by a single very soft and thin 

 shield, which covers nearly the whole surface; it bears near 

 the anterior edge three pairs of slightly curved, sharp bristles, 

 4 longitudinal dorsal rows of 5 bristles each and one marginal 

 row of bristles. The latter are inserted in a distinctly demar- 

 cated but very weak and soft marginal shield. 



Fig. 9. 



Fig. 8. 





Fig. 10. 



Fig. 9. Leg I of tritonympha masculina of Neomegistus. X 65. Fig. 8. 

 Hypostom and niaxillary palp. X 220. Fig. 10. Part of coxa I and II. X 220. 



The ventral side. The outlines of the jugidar shield are 

 visible but the shield is transparent and soft; it bears a pair 

 of feathered bristles. The rest of the ventral side is protected 

 by a single shield which however does not comprize the anus. 

 The låter al edges of the sternal and metasternal portions of the 

 ventral side are thickened; the}^ bear 5 pairs of bristles whose 

 position is shown in Fig. 14, Pl. I. 



The genital aperture is circular and situated on a line 

 drawn between coxse TI and III. The ventral shield bears 

 bristles of the same size and shape as the dorsal side, only they 

 are straight, not curved. The metapodial shields are fused 

 with the ventral shield. 



^ The appeai'anc3 of a scaly texture may be due to the layer of 

 poh'gonal hypodermic cells. 



