58 Journal of Entomology and Zoology 



posterior spine of the last pair of each marginal series slightly 

 larger than the others. On the ventral surface there are sparsely 

 scattered hairs, arranged segmentally ; four spiracles located pos- 

 terior to the coxae of the front and middle legs. Anal lobes not 

 chitinized, each with three small ventral and one large terminal 

 setae (Figs. C, D) and two dorsolateral spines on the inner sur- 

 face. These spines are slightly larger than the cephalothoracic 

 spines mentioned above, not expanded at the base and very blunt. 

 The last pair of the marginal spines are located dorso-laterally 

 near the basal end of the anal lobe (Fig. E). The terminal setae 

 of the anal lobes are about two and one half times as long as the 

 anal lobes themselves (Fig. C), while the eight setae of the anal 

 ring are less than the length of the anal lobes. Antennae medium 

 stout, six to eight segmented (Figs. G, H, I, J,), the normal long 



Fip. A. t'rincocniK palustris n. sp., adult female cleared in caustic potash. 



third divided into the third and fourth, and the normal ultimate 

 segment divided into the seventh and eighth. Apparently this di- 

 vision is not clo.sely related to the moults. Legs rather slender 

 (Fig. F), claws not toothed, digitules with flat apical enlargements. 



Male. — Body 1 mm. long; folded wings projecting •'/|. mm. be- 

 yond end of abdomen. 



