403 



Fig. 16. Platyrhachus submissus, keel of 7th segment. 



» le. » » transverse section of segment. 



»2. » bidens, nat. size Q (head too prominent). 



» 2a. » » keel oi 5th segment. 



» 26. » » right copulatory foot, from inside. 



» 3. » aequidens, nat. size cf. 



» 3a. » » keel of 5th segment. 



» 36. » » right copulatory foot, from inside. 



» 4. Strongylosoma weberi, nat. size cf. 



» 4a. » » left copulatory foot from outside. 



» 5. Cryptodesmus bicolor, nat. size. 



» 5a. » » head and first dorsal plate. 



» 56. » » median dorsal plate. 



» 5c. » » anal tergite. 



» 5d. » » anal sternite. 



» Be. » » left copulatory foot from below. 



» 5f. » » right copulatory foot from outside. 



» 6. Thyropygus eryihropleurus , nat. size. 



» 6a. » » anterior end of cf. 



» 66. » » posterior end. 



>) 7. Rhynckoproctus proboscideus , nat. size çf (collum too narrow). 



» 7a. » » anterior end. 



» 76. » » posterior end. 



» 7c. » » copulatory foot, from before. 



» 8. Spirostreptus vittalus, nat. size. 



» 8a. » » anterior end of cf. 



» 86. » » ditto of Q. 



» 8c. » » posterior end of Q. 



» 8a". » » copulatory organ from before. 



PLATE XXII. 



Fig. 1. Platyrhachus inaequidens , keel of 5th segment. 



la. » » right copulatory foot from outside. 



2. Strongylosoma pygmaeum, ditto from below. 

 2a. » » ditto from the outside. 



3. » vinosum, ditto from below. 



4. » carneum, ditto from outside. 

 4a. r> » anal sternite. 



5. » semicarneum , left copulatory foot from inside. 



6. » nigricorne, right copulatory foot from below. 



7. » subnigrum, left ditto. 

 7a. » » anal sternite. 



8. » flavicozis, left copulatory foot from below. 



9. » conspicuum , nat. size. 



10. Centrodesmus typicus, anterior end of body (tips of keels fractured). 

 10a. » » dorsal view of a segment. 

 106. » » lower view of keel of 15th segment. 

 10c. » » anal tergite. 



11. Doratonotus armatus, nat. size extended. 

 11a. » » ditto rolled up. 



