Studies on Arthropod a. I. 



Fig. 2 c. Left tibia, from the upper side; x 13. 



- 2 d. Left tarsus, from the outer side; x 13. u. upper 



margin. 



- 2e. Distal joints of left fourth leg, from above; x 23 /s- 



Fig. 3. Trithyreus parvus n. sp. 



Fig. 3 a. Left palp and first leg of the male, from the outer 

 side; x 20. 



- 3 b. Left palp of the male, from the outer side; X 35. 



3 c. Left palp af the female, from the outer side; x 35. 



- 3 d. Left first foot of the male, from the side; x 47. 



3 e. Left first foot of the female, from the side ; x 47. 



- 3 f . Left fourth leg of the male, from the side ; x 20. 



- 3 g. Left fourth leg of the female, from the side ; X 20. 

 3 h. The three posterior abdominal segments with flagel- 



lum of a male, from above; x 60. 



- 3 i. The same segments with flagellum of a male, from 



the side; x 60. 



3k. Posterior abdominal segments with flagellum of a 

 female, from the side; x 60. 



Fig. 4. Trithyreus brevicauda n. sp. (continued). 

 Fig. 4 a. Foot of first left leg of the female, from the side ; x 46. 



- 4 b. Left fourth leg of the male, from the side; X 20. 



- 4 c. Major part of left fourth leg of the female, from the 



side; x 20. 



- 4 d. Posterior abdominal segment with flagellum of a 



female, from the side; x 62. 



Plate II. 



Fig. i. Trithyreus brevicauda n. sp. (continued). 

 Fig. i a. Left palp and first leg of the male, from the outer 

 side; x 20. 



