PLATE XXIX. 



External Structure. 



Fig. 1. Dorsal surface of female. 



a Dorsal surface. 



b Eyes. 



c Antenniform bristles. 



d Malpighian vessel. 



e Dermal glauds. 

 Fig. 2. Ventral surface of female. 



a Maxillary shield. 



h-e ; 1st (6), 2nd (c), 3rd (d), and 4th (e) epimera. 



/ Epimeral glands. 



g Coxa. 



h Trochanter. 



i Femur. 



k Patella. 



I Tibia. 



m Tarsus. 



n Eetractile claws. 



o Genital cleft (vulva). 



p Genital lips. 



q Genital plates with acetabula. 



r Anus. 



s Anal glands. 



t Fourth leg of female. 



u Swimming hairs. 



V Acetabula without special plates. 

 Fig. 3. Palpus. 



a-e ; 1st («), 2nd (6), 3rd (c), 4th (oO, and 5th (e) segments. 



/ Flexor margin. 



g Extensor margin. 



h Papillae with setae. 



i Peg or tooth without seta;. 

 Fig. 4. Mandible. 



a Claw. 



h Manubrium. 

 Fig. 5. Fourth leg of male. (Letters correspond with those of Fig 2.) 

 Fig. 6. Terminal segment of third leg of male. (Fig. 14 is another 



form.) 

 Fig. 7. Tongue-shaped genital plate of female. 

 Fig. 8. Disc-shaped genital plate of female. 

 Fig. 9. Sickle-shaped plate of female, with acetabula on plate. 



a Acetabula free within the curve of the sickle - shaped 

 plate. There may be one or more such acetabula 

 according to the species. 

 Fig. 10. Cherry-shaped seminal pocket of male. 

 Fig. 11. Trefoil-shaped seminal pocket of male. 

 Fig. 12. Genital area of male without any distinct seminal pocket. 

 Fig. 13. Common form of retractile claw. 

 Fig. 14. Terminal segment of third leg of male. (Fig. 6 is another form.) 



