40 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8o 



EXPLANATION OF PLATES 



(All drawings are by the writer) 



Plate i 



Fig. I. The third left leg of a solpugid, showing muscle attachments. 

 Fig. 2. Leg I of the primitive phalangid, Holosiro acaroides, with segments 

 labeled. 



Plate 2 



Fig. 3. Front leg of Lab idost omnia sp. showing muscle attachments. 

 Fig. 4. Third leg of the gamasid mite, Macrocheles tridentifer, showing 

 muscle attachments. 



Plate 3 



Fig. 5. Front leg of tick, Rhipicephaliis sanguineus, showing muscle attach- 

 ments. 



Fig. 6. A, hind leg of pseudoscorpion, Chdifcr cancroidcs, showing muscle 

 attachments; B, end of hind leg of pseudoscorpion, Obisium mari- 

 timum, showing same. 



Plate 4 



Fig. 7- The second leg of Acercntuhis barbcri showing segmentation and 



musculature. 

 Fig. 8. Leg IV of Pauropus sp. showing segmentation and musculature. 

 Fig. 9. Coxal appendage of last pair of legs of Pauropus sp. 

 Fig. 10. Antepenultimate leg of symphylid, Sciitigerella immaculata, showing 



segmentation and muscles. 



Plate 5 



Fig. II. Front leg of a symphylid of the genus Hanseniella showing segmen- 

 tation and musculature. 



Fig. 12. The region about the coxa in a symphylid of the genus Hanseniella, 

 showing muscle attachments. 



Fig. 13. Third leg of Machilis sp. showing segmentation and muscles. 



Fig. 14. Middle leg of lepismid, Thcrmobia sp., showing segmentation. 



Plate 6 



Fig. 15. Second leg of Campodea sp., showing segmentation and muscles. 



Fig. 16. Third leg of the collembolan, Tomocerus arcticus, showing muscula- 

 ture. 



Fig. 17. The musculature of third leg of the collembolan, Aphorura ambnlans 

 (Linn.). 



Fig. 18. Prothorax, with attached leg, and neck region of collembolan (Iso- 

 toma sp.). Specimen cleared with KOH and stained with acid 

 fuchsin. 



